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CBSE Questions for Class 11 Medical Biology Morphology Of Flowering Plants Quiz 16 - MCQExams.com
CBSE
Class 11 Medical Biology
Morphology Of Flowering Plants
Quiz 16
Persistant calyx is characteristics of
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Allium
or Liliaceae
0%
Hibiscus
or Malvaceae
0%
Dalbergia
or Papilionatae
0%
Solanum
or solanaceae
Explanation
Persistant calyx is characteristics of
Solanum
of Solanaceae. In the great majority of species, the flowers have a differentiated perianth with a calyx and corolla an androecium with five stamens and two carpels forming a gynoecium with a superior ovary. The stamens are epipetalous and are typically present in multiples of four or five, most commonly four or eight. They usually have a hypogynous disk. The calyx is gamosepalous.
Therefore, the correct answer is option D.
Nicotiana
and potato belongs to
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Malvaceae
0%
Liliaceae
0%
Solanaceae
0%
Cruciferae
Explanation
Nicotiana and potato belong to Solanaceae family. The other important crops in this family include pepper, eggplant and tomato. Solanaceae family is also called nightshades.
The scientific name of potato is
Solanum tuberosum.
Lycopersicon esculentum
belongs to the family
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0%
Solanaceae
0%
Malvaceae
0%
Cruciferae
0%
Cucurbitaceae
Explanation
The
Lycopersicon esculentum
belongs to the nightshade family, Solanaceae. The plants typically grow to 13 meters in height and have a weak stem that often sprawls over the ground and vines over other plants. It is a perennial in its native habitat, although often grown outdoors in temperate climates as an annual.
Therefore, the correct answer is option A.
Simla mirch (Capsicum\, fruitescence) chillies and potato belong to the family
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Solanaceae
0%
Compositae
0%
Graminaceae
0%
Cruciferae
Explanation
Simla mirch (Capsicum) chillies and potato belong to family Solanaceae
.
Capsicum or bell peppers is a genus of flowering plants in the nightshade family Solanaceae. In modern times, it is cultivated worldwide and has become a key element in many regional cuisines.
Spike of spikelets inflorescences commonly occurs in
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0%
Cruciferae
0%
Papilionatae
0%
Poaceae
0%
Solanaceae
Explanation
Spike of spikelets inflorescences commonly occurs in Poaceae. Flowers of
Poaceae
are characteristically arranged in spikelets, each spikelet having one or more florets. The spikelets are further grouped into panicles or spikes. A spikelet consists of two bracts at the base, called as glumes, followed by one or more florets. A floret consists of the flower surrounded by two bracts, one external the lemma and one internal palea.
Therefore, the correct answer is option C.
Bicarpellary, syncarpous gynoecium with bilocular ovary axile swollen placenta and oblique septum occurs in
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Cruciferae
0%
Solanaceae
0%
Cucurbitaceae
0%
Liliaceae
Explanation
In Cruciferae, gynoecium is bicarpellary, syncarpous with unilocular ovary which later becomes bilocular due to false septation. It shows parietal placentation.
In Cucurbitaceae, gynoecium is tricarpellary, syncarpous with unilocular ovary in parietal placentation.
In Liliaceae, gynoecium is tricarpellary, syncarpous with trilocular ovary in axile placentation.
In Solanaceae, gynoecium is bicarpellary, syncarpous
with bilocular ovary in axile placentation with swollen placenta.
Oblique septum occurs in ovules.
Therefore, the correct answer is option B.
The family fabaceae is alternatively of
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Leguminosae
0%
Solanaceae
0%
Compositae
0%
Malvaceae
Explanation
The Fabaceae or Leguminosae, commonly known as the legume, pea or bean family, are a large and economically important family of flowering plants. It includes trees, shrubs and herbaceous plants perennials or annuals, which are easily recognized by their fruit and their compound, stipulated leaves. The group is widely distributed and is the third-largest land plant family in terms of number of species, behind only the Orchidaceae and Asteraceae, with 630 genera and over 18,860 species. So, Fabaceae is an alternative of Leguminosae and not Solanaceae, Compositae and Malvaceae.
Therefore, the correct answer is option A.
Colchicum plant which gives cholchicine alkalloid belongs to which family
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Leguminosae
0%
Malvaceae
0%
Liliaceae
0%
Cruciferae
Explanation
Colchicum
plant which gives
cholchicine
alkalloid belongs to which family
Liliaceae
. The plant contains the alkaloid colchicine which is used pharmaceutically to treat gout and Familial Mediterranean fever. The use of the roots and seeds in traditional medicine is thought to have arisen due to the presence of this drug.
The perianth term used when
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Androecium and gynoecium are similar
0%
Calyx and corolla are similar
0%
Androecium and calyx are similar
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Corolla and gynoecium are similar
Explanation
A) Correct option- B
B) Explanation of correct option
Perianth is a collective term for outer parts of calyx and corolla enclosing androecium and gynoecium.
This term is used to refer petalideous monocotyledons, in which the calyx and corolla are combined that they cannot be distinguished from each other.
Example - Plants of Liliaceae family.
Presence of racemose head and bicarpellary
syncarpus ovary with basal placentation belongs to
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Malvaceae
0%
Compositae
0%
Liliaceae
0%
Solanaceae
Explanation
The family Compositeae or Asteraceae as it is presently referred to is characterized with an inflorescence which is a specialized capitulum or a flower head. This capitulum which is a racemose head is composed of numerous florets.
Further the pistils with two connate carpels makes it bicarpellary and the ovary which is inferior has an ovule with basal placentation.
Therefore, the correct answer is option B.
Colchicum autumnale belongs to
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Leguminosae
0%
Cruciferae
0%
Liliaceae
0%
Malvaceae
Explanation
Colchicum autumnale
, commonly known as autumn crocus, meadow saffron or naked lady is a flower that resembles the true crocuses, but blooms in autumn.
The species is commonly cultivated as an ornamental in temperate areas, in spite of its toxicity. It belongs to family Liliaceae and not to Malvaceae, Cruciferae or Leguminosae.
Therefore, the correct answer is option C.
Awn of wheat and barley is developed from
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Glume I
0%
Glume II
0%
Lemma
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Palea
Explanation
Awns are characteristic of many grasses (Poaceae), where they extend from the lemmas of the florets. This often makes the hairy appearance of the grass synfloresce. Awns may be long or short, straight or curved, single or multiple per floret. Some genera are named after their awns, such as the three-awns (Aristida). In some species, the awns can contribute significantly to photosynthesis, as, for example, in barley. The awns of wild emmer wheat spikelets effectively self-cultivate by propelling themselves mechanically into soils.
During a period of increased humidity during the night, the awns of the spikelet become erect and draw together and in the process push the grain into the soil. During the daytime the humidity drops and the awns slacken back again. However, fine silica hairs on the awns act as ratchet hooks in the soil and prevent the spikelets from reversing back out again. So, awn of wheat and barley develops from lemma.
Therefore, the correct answer is option C.
A family whose name is based upon its inflorescence is
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Euphorbiaceae
0%
Asteraceae
0%
Fabaceae
0%
Malvaceae
Explanation
The Asteraceae or Compositae are an exceedingly large and widespread family of flowering plants (Angiospermae). The main feature of the family is the composite flower type in the form of capitula surrounded by involucral bracts. The name Asteraceae comes from Aster, the most prominent genus in the family, that derives from the Greek, meaning star and is connected with its inflorescence star form. As for the term Compositae, more ancient but still valid, it obviously makes reference to the fact that the family is one of the few angiosperm ones to have composite flowers. Euphorbiaceae, Fabaceae and Malvaceae family names are not based on their inflorescence.
Therefore, the correct answer is option B.
A characterstic feature of ovary of
Brassica campesteris
is
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Presence of replum
0%
Axile placentation
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Epigynous
0%
Multilocular nature
Explanation
Brassica
campesteris belongs to family Brassicaceae.
Flowers of family Brassicaceae shows parietal placentation.
Flowers of family Brassicaceae shows superior ovary i.e. sepals and petals are below the ovary. Such flower is called as Hypogynous.
Flowers of family Brassicaceae has unilocular ovary.
Flowers of family Brassicaceae e.g.,
Brassica campesteris
possess unilocular ovary which becomes bilocular due to false septum called as replum.
Therefore, the correct answer is option A.
Family Liliaceae is characterised by
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Trimerous flower
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Tetramerous flower
0%
Pentamerous flower
0%
Zygomorphic flower
Explanation
Family Liliaceae
is characterised by trimerous flowers. The flowers may be arranged (inflorescence) along the stem, developing from the base or as a single flower at the tip of the stem or as a cluster of flowers. They contain both male (androecium) and female (gynoecium) characteristics and are symmetric radially, but sometimes as a mirror image. Most flowers are large and colourful.
So
, the correct answer is '
Trimerous flower'
Umbel inflorescence is found in
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Musa
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Colocasia
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Coriandrum
0%
Helianthus
Explanation
Inflorescence is the arrangement of flower on the floral axis. There are two types of inflorescence as racemose and cymose. In racemose type, the main axis is unlimited in growth. It never terminates into a flower. There are many sub-types of racemose inflorescence. Of them, umbel inflorescence is one of the sub-type of racemose.
Umbel inflorescence contain a very shortened and suppressed axis. It contains flowers with equal length stalks and form a cluster. It gives an umbrella like appearance.
Musa
and
Colocasia
possess spadix type of inflorescence. Spadix also belongs to racemose type of inflorescence. It has a spike with fleshy axis which is enclosed by one to many, large bracts. The flowers are borne inside this structure.
Helianthus
possess head or capitulum type of inflorescence. Head or capitulum also belongs to racemose type of inflorescence. It possess a flattened, convex main axis called receptacle. This receptacle bears flowers in centripetal order. The whole inflorescence is surrounded by a whorl of bracts.
Coriandrum shows umbel inflorescence with a very shortened and suppressed axis. It contains flowers with equal length stalks and form a cluster. It gives an umbrella like appearance.
Therefore, the correct answer is option C.
The anthers in Solanaceae are
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Monothecus, introrse
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Dithecous, extrorse
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Dithecous, introrse
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Monothecous, extrorse
Explanation
Anther is the part of male reproductive unit of plant. Male reproductive unit of plant is called as androecium. Androecium is composed of stamens and each stamen is made up of filament and an anther. Depending on the number of anther lobes, the stamens are termed as monothecous (one lobed), dithecous (two lobed).
Anthers contain pollen sacs which contain pollen grains. For the release of these pollen grains the anther dehisces. There are three types of dehiscence of anthers as extrorce, introrce and latrose.
In extrorce type of dehiscence, anthers dehisce towards the petals.
In introrce type of dehiscence, anthers dehisce towards gynoecium.
In latrose type of dehiscence, anthers dehisce laterally.
In Solanaceae, anthers are of dithecous type dehiscing introrse.
Therefore, the correct answer is option C.
Edible part of Cauliflower is
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Bud
0%
Leaves
0%
Inflorescence
0%
Fruit
Explanation
Cauliflower is one of several vegetables in the species
Brassica oleracea
, in the family Brassicaceae. It is an annual plant that reproduces by seed. Typically, only the head is eaten. The cauliflower head is composed of a white inflorescence meristem. Cauliflower heads resemble those in broccoli, which differs in having flower buds.
Brassica oleracea
also includes broccoli, brussels sprouts, cabbage, collard greens and kale, though they are of different cultivar groups. Perhaps the most popular among agricultural crops that produce edible flowers are the cauliflower and broccoli (
Brassica oleracea
) and globe artichoke (
Cynara scolymus
). There is a steady and high demand for their flowers and they are thus grown intentionally in commercial scale. They are commonly used worldwide as flower vegetables, that is, their main usage is in culinary preparation including salads. However, their economic parts consist not only of pure flowers but rather of the entire immature inflorescence or flower cluster. So, edible part of cauliflower is inflorescence and not bud, leaves and fruit.
Therefore, the correct answer is option C.
Velamen and spongy tissue are found in
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Breathing roots
0%
Parasitic roots
0%
Tuberous roots
0%
Epiphytic roots
Explanation
Epiphytes are plants that grow on other plants. They attach to larger plants with an adapted root system. Most epiphytes are not parasitic in nature and do not deprive the host plant of nutrients. Common examples of epiphytes include orchids (Orchidaceae family) and bromeliads (Bromeliaceae family). Epiphyte roots act as support structures just as roots planted in soil. Orchid roots are typical examples of this adaptation. The inside of an orchid root is called as the cortex. This nourishes the plant and is very strong. It is covered by the velamen, a material that can cling to almost anything. The velamen is also efficient in absorbing moisture or any nutrients found on the host plant, like minute traces of leaves and other debris. The epiphytic roots of orchids develop a spongy tissue to absorb moisture and nutrients from any organic material on their roots. So, velamen and spongy tissue are found in epiphytic roots and absent in breathing roots, parasitic roots and tuberous roots.
So, the correct answer is '
Epiphytic roots'
In
Musa
, inflorescence is
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Capitulum
0%
Corymb
0%
Spadix
0%
Polychasial cyme
Explanation
The trunk of the pseudostem in the species of
Musa
is made of tightly packed layers of leaf sheaths. The inflorescence grows horizontally from the trunk where individual white to yellow flowers grow geotropically negative
.
Since, both male and female flowers are present in a single inflorescence. Female flowers located near the base develops into a fruit and male flowers are found between leathery bracts and the inflorescence is called as a spadix.Therefore, the correct answer is option C.
In cyathium inflorescence, the ratio between male: female flower is
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One: One
0%
One: Many
0%
Many: One
0%
Many: Many
Explanation
A cyathium is one of the specialised pseudanthia (false flowers) forming the inflorescence of plants in the genus
Euphorbia
(Euphorbiaceae). A cyathium consists of five bracteoles. These are small, united bracts, which form a cup-like involucre. Their upper tips are free and in the beginning cover the opening of the involucre. These alternate with five (1 to 10) nectar glands, which are sometimes fused. One extremely reduced female flower standing in the centre at the base of the involucre, consisting of an ovary on a short stem with pistil and surrounded by five groups of extremely reduced male flowers, which each consist of a single anther on a stem. The flower-like characteristics of the cyathia are underlined by brightly coloured nectar glands and often by petal-like appendages to the nectar glands, or brightly coloured, petal-like bracts positioned under the cyathia. The paired petal-like bracts of
Euphorbia
section Goniostema are called as cyathophylls. Here female to male flower ratio is 1.
Therefore, the correct answer is option C.
Cyathium and hypanthodium inforescence are to family similar in having
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Nectar glands
0%
Unisexual flower
0%
Both (A) and (B)
0%
None of the above
Explanation
Cyathium - Here, the inflorescence is highly reduced. It has a cup shaped receptacle formed by the fusion of five bracts. On the surface of this cup, generally a yellow coloured nectar secreting gland is present. A single female flower arises from the centre of the cup. It is highly reduced and is borne on a long stalk. The male flowers are highly reduced and are produced in a scorpioid manner from the axil of each bract e.g.,
Euphorbia pulcherrima
.
Hypanthodium - In this type of inflorescence the receptacle becomes spherical with a cavity inside. It opens to the outside with a small opening. Numerous small sessile flowers are produced from the inner surface of the receptacle. These flowers are of three types: male flowers, female flowers and sterile female flowers (gall flowers) e.g.,
Ficus
. No nectar glands. So, cyathium and hypanthodium inforescence are to family similar in having unisexual flowers and not in nectar glands.
Therefore, the correct answer is option B.
Verticilaster which is the characteristic of family Labiatae is a type of
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Phyllotaxy
0%
Inflorescence
0%
Placentation
0%
Venation
Explanation
Verticellaster - Verticellaster is a special type of inflorescence seen in
Leucas
. At each node of the stem two axillary opposite cymose inflorescences develop on either side. The cyme in the axil of each leaf, starts as a dichasial cyme but subsequently become monochasial scorpioid cyme. As a result the cyme bends round the stem on either side and meets a similar cyme from the opposite side. Hence, at each node there is a cluster of flowers completely surrounding the stem. This is the characteristic of family Labiatae. So, Verticilaster is a type of inflorescence and not placentation, venation and phyllotaxy.
Therefore, the correct answer is option B.
After two or three years of secondary growth, the cortex in dicot roots
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Remains intact.
0%
Is completely sloughed away.
0%
Is largely lost.
0%
Is converted into cork.
Explanation
Anatomical studies of the dicot root shows that the cortex forms the ground tissue and is responsible for the storage of photosynthetic products and uptake of water and minerals. Secondary growth also occurs in the roots and when the secondary xylem and phloem enlarge, the vascular cambium is sandwiched. The expansion of the secondary xylem, phloem and epidermis causes the cortex to slough away.
Thus, the correct answer is option B.
Verticillaster inflorescence is the characteristic feature of family
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0%
Euphorbiaceae
0%
Moraceae
0%
Musaceae
0%
Lamiaceae
Explanation
The term inflorescence refers to the group or cluster of flowers arranged on a stem or on an arrangement of branches. While there are number of simple and compound inflorescence, verticellaster is a special type of inflorescence where at each node of the stem two axillary opposite cymose inflorescences develop on either side. The cyme in the axil of each leaf, starts as a dichasial cyme but subsequently become monochasial scorpioid cyme. The cyme bends round the stem on either side and meets a similar cyme from the opposite side, bringing about a cluster of flowers at each node. This type of inflorescence is commonly found in Lamiaceae. Very often verticillasters with reduced bracts form an inflorescence commonly called as a spike.
Therefore, the correct answer is option D.
The type of inflorescence in Tulsi
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Cyathium
0%
Hypanthodium
0%
Verticillaster
0%
None of the above
Explanation
Tulasi or
Ocimum Sanctum
belongs to family Lamiaceae and its flowers are tiny, purple and inflorescence is a verticillaster and forms a spike that is 12-14 cm in length.
Therefore, the correct answer is option C.
Edible part of cauliflower is
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Cotyledons
0%
Mesocarp
0%
Endocarp
0%
Inflorescence
Explanation
Edible part of the cauliflower is inflorescence which can be defined as the arrangement of flowers on the plant. Cauliflower is the member of family Brassica. Only the head part of cauliflower is eaten which is composed of a white inflorescence meristem.
Number of female flowers found in cyathium is
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$$1$$
0%
$$2$$
0%
$$3$$
0%
Several
Explanation
Cyathium has one reduced female flower. It is present in the centre and consist of an ovary, pistil and is surrounded by male flowers.
So, the correct answer is '1'
Bamboo is
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Culm
0%
Bulb
0%
Runner
0%
Twiner
Explanation
$$\textbf{Correct Option A}$$
$$\textbf{Solution}$$
$$\bullet$$ $$\textbf{Option A}$$ Culm is referred to the stem which is joined with the nodes and internodes. The nodes are solid while the internodes are hollow. One of the example is bamboo.
$$\bullet$$ $$\textbf{Option B}$$
Bulb is referred to the stem which have structure that surrounds it having scaly leaves which have food stored in them. Some examples are onion and garlic.
$$\bullet$$ $$\textbf{Option C}$$
Runner is referred to a stem which spreads on the soil roots are developed to the download direction and the leaves towards the opposite direction of the node. Some examples are oxalis.
$$\bullet$$ $$\textbf{Option D}$$
Twiners are the stems which two winds around with the help of a support without any structural arrangement and attachment. Ex:- Cuscuta.
So, the correct option is A.
Arrangement of floral members which are partly spiral and partly in whorl is
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Cyclic
0%
Acyclic
0%
Hemicyclic
0%
Pentacyclic
Explanation
Hemicyclic flowers are flowers having floral leaves partly in spiral and partly in whorl.
The inflorescence found in the coconut plant is
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Spadix
0%
Compound spadix
0%
Compound spike
0%
Compound corymb
Explanation
The type of inflorescence in which flowers are protected by enveloping bracts known as a spathe. ex:-banana.
The flowers are protected by spathe but the axis is branched. ex: palm and coconut.
The axis is branched and the flowers are born sessile on the branches. ex: wheat.
When the main axis is branched and flowers are arranged in a corymbose manner. ex:-cauliflower
So the correct option is "Compound spadix".
Rhipidium inflorescence of
Solanum nigrum
is
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Modified scorpiod cyme
0%
Helicoid cyme
0%
Capitulum
0%
Multiparous cyme
Explanation
Rhipidium is scorpioid cyme having all flowers in one plane.Ex.
Solanum nigrum
In helicoid cyme, the flowers are born on one side. Ex Begonia
Capitulum also called Racemose head in which peduncle is flattened that form receptacle that holds centripetally arranged sessile flowers or floret surrounded by an involucre of bracts. Ex Sunflower Helianthus annuu.
In multiparous cyme, the main branch converts into flower the old flower at the center and younger at the periphery while it produces lateral branch as well. Ex Calatropis.
So the correct option is "Modified scorpioid cyme".
State the order in which various parts of flower are arranged from outer side to inner side.
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Carpel $$\rightarrow $$ Stamen $$\rightarrow $$ Petals $$\rightarrow $$ Sepals
0%
Sepals $$\rightarrow $$ Petals $$\rightarrow $$ Stamen $$\rightarrow $$ Carpel
0%
Petals $$\rightarrow $$ Sepals $$\rightarrow $$ Stamen $$\rightarrow $$ Carpel
0%
Sepals $$\rightarrow $$ Petals $$\rightarrow $$ Carpel $$\rightarrow $$ Stamen
Explanation
Each of the part of flower is arranged in a whorl on the receptacle. The four main whorls starting from outer side to inner side are as follows:
Sepals: are the green outermost leaf like floral organs which protect the flower in bud stage and provide support to outer floral organs.
Petals: are colored accessory floral organs which lie above sepals and they may also provide protection to centrally placed reproductive organs (stamens and carpel).
Stamens: are located inside the corolla and are leaf-like appearance and are male reproductive part.
Carpels are female reproductive part and are one or more in number and are located in the upper center of the flower
So, the correct answer is '
Sepals $$\rightarrow $$ Petals $$\rightarrow $$ Stamen $$\rightarrow $$ Carpel'
Inflorescence of sunflower is
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0%
Umbel
0%
Cyathium
0%
Hypanthodium
0%
Capitulum
Explanation
Sunflower is an annual plant of family Asteraceae with a large head (capitulum), which is the characteristic inflorescence of sunflower. Depending upon the variety, the inflorescence may consist of ray flowers, disk flowers or both. The ovary of each flower is situated below the attachment of the corolla and stamens, a condition referred to as epigynous or inferior. This is the largest family of flowering plants
So, the correct answer is '
Capitulum'
The edible part of cauliflower is
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Inflorescence
0%
Leaf
0%
Flower
0%
Stem
Explanation
Cauliflower belongs to the species
Brassica oleracea
from the family Brassicaceae.The edible part of the plant though includes the outer jacket leaves and the white center called as the curd, mostly only the white curd is used. This white curd or cauliflower head is actually a white inflorescence meristem which resembles the broccoli.
Therefore the correct answer is option A.
The fleshy receptacle of syconus of fig encloses a number of
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Achenes
0%
Samaras
0%
Berries
0%
Mericarps
Explanation
The inflorescence of figs is known as syconium. This is formed by an enlarged, fleshy, hollow receptacle with multiple ovaries on the inside surface. After pollination the florets develop into achenes or drupes, which encloses the seeds.
Solanine is
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Not known to be harmful to humans
0%
A naturally occurring toxin found in green potatoes
0%
A naturally occurring toxin found in shellfish
0%
A toxin that grows on corn and peanut products
Explanation
Solanine is a glycoalkaloid poison found in species of the nightshade family (Solanaceae), such as the potato (Solanum tuberosum) and the tomato (Solanum lycopersicum). It can occur naturally in any part of the plant, including the leaves, fruit, and tubers. Solanine has pesticidal properties, and it is one of the plant's natural defenses.
Therefore, the correct answer is option B.
Pappus is modified
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Calyx
0%
Corolla
0%
Bracts
0%
Gynoecium
Explanation
Pappus is a modified calyx, that surrounds the base of the corolla tube in the flower heads of the plant family Asteraceae.
Thus the correct answer is option A.
Catkin inflorescence is found in
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Wheat
0%
Oat
0%
Mulberry
0%
Fig
Explanation
Catkin is a type of inflorescence that is found in willows, birches and oaks and is characterized by
dense,
cylindrical,
often
drooping
cluster
of
unisexual
apetalous
flowers
. Mulberry flowers are produced in a catkin, with male and female catkins on different trees.
In cyathium inflorescence, the ratio between male : female flower is
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0%
One : One
0%
One : Many
0%
Many : One
0%
Many : Many
Explanation
In cyathium inflorescence, the bracts become fused to form a cup shaped structure. This cup completely encloses a single female flower surrounded by large number of male flowers. The cyathium is surrounded by brightly coloured bracts.
Plants sense gravity with the help of
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Phytochromes
0%
Statoliths
0%
Phytohormones
0%
Abscisic acid
Explanation
In the root cap there is a special subset of cells, called as statocytes. Inside the statocyst cells, some specialized amyloplasts are involved in the perception of gravity by the plant (gravitropism). Statoliths settle at the bottom part of their cells and allow plants to sense gravity. Statoliths are also found in the endodermal layer of the inflorescence stem. The redistribution of auxin causes the shoot to turn in a direction opposite that of the gravity stimuli.
So, the correct answer is '
Statoliths'.
Cyathium and hypanthodium inflorescence are related in having
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Nectar glands
0%
Unisexual flower
0%
Both A and B
0%
None of the above
Explanation
Inflorescence refers to the arrangement of flowers or cluster of flowers on the stem. Cyathium inflorescence is characterized by a condensed floral axis that forms a cup-shaped structure and unisexual flowers in cymose clusters. Hypanthodium inflorescence is characterized by the floral axis being fleshy and closed forming a pear shaped receptacle. Flowers are unisexual in cymose clusters. However, in Cyathium there is the presence of involucre with nectary gland. The similarities between these two inflorescence is the presence of unisexual flowers.
Trimerous flower, superior ovary and axile placentation is characteristics of
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Liliaceae
0%
Cucurbitaceae
0%
Solanaceae
0%
Compositae
Explanation
The floral characteristics of trimerous flower, superior ovary and axile placentation are the diagnostic features of the species of Liliaceae family, where the flower is a pedicilate, bracteate with 6 perianth leaves arranged in two whorls, gynoecium being tricarpellary and syncarpous with superior ovary.
In moss capsule, the number of peristome whorls are
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1
0%
2
0%
3
0%
4
Explanation
In mosses, the peristome is a specialized structure in the sporangium
that allows for gradual spore discharge, instead of releasing them all
at once.
Peristome is a ring of triangular teeth formed from the remnants of
dead cells with thickened cell walls. There are usually 16 such teeth
in a single peristome, separate from each other and able to both
fold in to cover the stoma as well as fold back to open the stoma. T
here are two rings of peristome teeth - an inner
endostome and an exostome. These are also
referred as perostome whorls.
Therefore the correct option is B.
Study the following lists.
List-I
List-II
(A) A piece of underground branches store
(I) Mentha food material
(B) Underground branches grow obliquely upward from the axillary buds of nodes of the stem below the soil.
(II) Hydrocotyl
(C) Aerial branches grow obliquely downwards.
(Ill) Agave and produce adventitious roots after touching the soil
(D) Weak stemmed plants have a cluster of leaves.
(V) Stachys and roots at every node
(V) Jasminum
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A- (III), B- (IV), C- (II), D- (I)
0%
A- (IV), B- (V), C- (III), D- (II)
0%
A- (IV), B- (I), C- (V), D- (II)
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A- (II), B- (V), C- (I), D- (III)
Explanation
The apices of these underground branches store food materials and become tuberous. These are called stem tubers. In Stachys tubifera, the reserve food is stachyose.
the underground branches grow obliquely upward from the axillary buds of nodes present below the soil. These underground branches are called suckers. For example, Chrysanthemum and Mentha.
In some plants, the long slender branches which arise from the base of the stem grow obliquely downwards. When these branches touch the soil, they produce adventitious roots. These branches are called stolons. For example, jasminium and Rosa.
In some weak stemmed plants, the stem creep on the soil and are rooted at every node. When the internode break off, the nodes lead an independent life. These weak stemmed plants are called runners. For example, Hydrocotyl vulgaris.
Thus, the correct answer is option (C).
Identify the correct combination of character found in Solanum.
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Solitary axillary flower, berry fruit, bicollateral vascular bundles in stem
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Solitary terminal flower, porous dehiscence of anther, adnation of petiole with the stem
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Scorpioid cyme, porous dehiscence of anther, calyx remain attached to the fruit
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Scorpioid cyme, longitudinal dehiscence of anther, adnation of peduncle with internode
Explanation
Scorpiod cyme i.e., lateral branches develop successively on eitherside in zig zag manner e.g., Heliotropium and
Solanum.
In Solanum, the anther dehiscence by apical pore as well as by pores formed in longitudinal suture.
Calyx is said to be persistent when it remains attached to the fruits e.g., Solanum.
Therefore, the correct answer is option C.
Identify the set of characteristics related to plants belonging to family Fabaceae from the following.
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Actinomorphic flower, syncarpous ovary and marginal placentation
0%
Persistent calyx. epipetalous stamens and leguminous fruit
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Papilionaceous corolla, monoadelphous stamen and leguminous fruit
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Vexillary aestivation of corolla, diadelphous stamens and monocarpellary, unilocular ovary
Explanation
Fabaceae is distributed all over the world. Its floral characteristics include:
Inflorescence :- racemose
Flower :- bisexual, zygomorphic
Calyx :- sepals five, gamosepalous; imbricate aestivation
Corolla :- petals five, polypetalous, papilionaceous, consisting of a posterior standard, two lateral wings, two anterior ones forming a keel (enclosing stamens and pistil), vexillary aestivation
Androecium :- ten, diadelphous, anther dithecous
Gynoecium :- ovary superior, mono carpellary, unilocular with many ovules, style single
Thus, the correct answe ris option (D),
Identify the incorrect statements from the following.
P. Cymose inflorescence found in
Hibiscus
sp.
Q. Hypenthedium is found in
Ficus benghalensis.
R. Synandrous stamen is found in
Calotropis.
S. Hesperidium type of fruit is mango.
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R, S
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P, Q
0%
Q, R
0%
P, S
Explanation
Cymose
inflorescence is characterized by the main flowering stalk ending in a flower and the peduncle stops growing. This results in the production of flowers from lateral buds. Further, the flowers in this type of inflorescence shows basipetal succession with the oldest at the apex and youngest at the base. For e.g.,
Hibiscus
, periwinkle etc.
Hypanthodium is a special type of inflorescence where the peduncle is fleshy forming a hollow cup with an apical opening with sessile flowers inside. For e.g.,
Ficus.
Synandrous stamens where both and filaments and anthers are joined in the same whorl as in
Cucurbita maxima.
Hesperidium type of fruit is a berry which has a tough aromatic rind as is found in
Citrus sinesis
(orange) and
Citrus medica
.
W. L. Johannsen conducted pure line selection experiments on one of the bean varieties. Which of the following characters are associated with this plant?
(I) Cup shaped thalamus
(II) Odd sepal is anterior in position
(III) Actinomorphic flowers
(IV) Axile placentation
The correct combination is
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(II), (IV)
0%
(III), (IV)
0%
(I), (II)
0%
(I), (III)
Explanation
The bean belongs to the family Fabaceae. The characteristics of this class includes:
Flowers with cup shaped thalamus.
There are 5 sepals, green, gamosepalous showing valvate aestivation.
Odd sepal is anterior in position.
Thus, the correct answer is option (C),
Identify the correct statements from the following.
(I) A single male and a few female flowers are present in a flowers like inflorescence in poinsettia.
(II) Sessile or subsessile flowers formed in the axils of leaves are crowded at the nodes in
Leonotis
.
(III) In
Ficus,
a fruit like inflorescence is present with all fertile flowers.
(IV) The floral axis is sympoidal in
Hamelia
.
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(II), (IV)
0%
(I), (IV)
0%
(II), (III)
0%
(I), (III)
Explanation
The
Leonotis,
flowers are borne in dense rounded (i.e., spherical) clusters (5-6 cm across) towards the tops of the stems (usually 2-4 clusters per stem). Each of these clusters is arranged directly on the main stem, just above a pair of leaves (i.e., sessile axillary clusters).
Hamelia
has the floral axis or the cyme which shows the sympodial form.
So, the correct answer is option A.
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Practice Class 11 Medical Biology Quiz Questions and Answers
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