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CBSE Questions for Class 11 Medical Biology Plant Kingdom Quiz 9 - MCQExams.com
CBSE
Class 11 Medical Biology
Plant Kingdom
Quiz 9
Agar-agar commonly used in bacterial cultures and medication is obtained from
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0%
Sargasum
0%
Gelidium
0%
Ulothrix
0%
Ulva
Explanation
Agar agar is a gelling agent with unbranched polysaccharide and is used in microbiology as solidifying agent of liquid culture mediums. It is extracted from cell wall of red algae, mostly from Gelidium sp. and Gracilaria sp.
So the correct answer is B.
The product of conjugation in
Spirogyra
or fertilization of
Chlamydomonas
is
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0%
Zygospore
0%
Zoospore
0%
Oospore
0%
Carpospore
Explanation
Option 'A' correct
The product of conjugation is spisgyra or
fertilization is chlamydomonas is zygospore. A
diploid Eygole is The fusion product of male
and female cell. Zygospore is a spherical structure
will smooth and Thick wall.
A highly thickened non-motile spore is
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Macrozoospore
0%
Microzoospore
0%
Aplanospore
0%
Hypnospore
Explanation
Hypnospores are non-motile, thickened asexual spores in Chlamydomonas. They are the means of asexual reproduction in Chlamydomonas. The protoplasts of palmella develop a thick wall to form the hypnospores. They may develop a red-coloured pigment haematochrome in Chlamydomonas nivalis and thus causes the phenomenon of red snow. On the arrival of favorable conditions, they develop into zoospores.
Thus, the correct answer is option D.
Largest spermatozoids are those of
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0%
Pinus
0%
Selaginella
0%
Dryopteris
0%
Cycas
Two algae which produce agar-agar are
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0%
Nostoc
and
Anabaena
0%
Volvox
and
Vaucheria
0%
Gracilaria
and
Gelidium
0%
Harveyella
and
Porphyra
Explanation
The gelling agent in agar is an unbranched polysaccharide obtained from the cell walls of some species of red algae, primarily from the genera Gelidium and Gracilaria. For commercial purposes, it is derived primarily from Gelidium amansii. In chemical terms, agar is a polymer made up of subunits of the sugar galactose. so option C is correct.
Moss protonema resembles in structure with
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0%
Multicellular green alga
0%
Hypha of
Rhizopus
0%
Unicellular structure of
Acetabularia
0%
None of the above
Sterile uniseriate and multicellular hair present in receptacles of moss is
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0%
Epiphysis
0%
Paraphysis
0%
Apophysis
0%
Hypophysis
The storage product of rhodophyceae is
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0%
Glycogen
0%
Chrysolaminarin
0%
Starch
0%
Floridean starch
Explanation
Floridian starch is the characteristic photosynthetic reserve substance of red algae, occurring abundantly in certain basin-shaped grain cells.
Most Rhodophyceae store starch outside the chloroplast, often as a cap over a bulging pyrenoid.
The major carbohydrate storage product of red algae is a type of starch molecule (Floridean starch), that is more highly branched than amylopectin.
Floridian starch is stored as grains outside the chloroplast. so option D is correct
Male gametes of
cycads
are
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Rounded and non-ciliate
0%
Sickle-shaped biflagellate
0%
Boat-shaped nonciliate
0%
Large, top-like, spirally twisted with cilia
A colourless parasitic red alga is
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0%
Porphyra
0%
Harveyella
0%
Batrachospermum
0%
Chondrus
Explanation
Red algae are also known as rhodophytes, which is a eukaryotic alga without flagellate around 7000 living species are known till now. Red algae's are marine species. Since doesn't have flagella so motile stage is absent. It varies from unicellular to complex-multicellular algae. Most of them are autotropic except Harveyella which is a colorless parasitic red alga. Harveyella cells show secondary pit connections with other parasitic cells or host. Mostly Harveyella is parasitic over Polysiphonia.
So, the correct answer is option B.
Coralloid roots of
Cycas
possess a symbiotic alga
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0%
Aulosira
0%
Spirogyra
0%
Ulothrix
0%
Anabaena
Coralloid roots occur in
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0%
Pinus
0%
Ferns
0%
Cycas
0%
Mosses
Cycas
is living fossil as it has
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0%
Ciliated sperms
0%
Structure like that of Tree Fern
0%
Restricted occurrence in certain areas
0%
Been found in fossil state also
Explanation
Living fossil is a term used for an organism whose relatives are found only in the fossil state and which has a restricted distribution often threatened to become extinct.
So the coreect option is C.
An alga which can be possibly used in space flight (Space Alga) is
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0%
Nostoc
0%
Chlorella
0%
Ulothrix
0%
Spirogyra
Explanation
Chlorella is a green algae. It is a rich source of proteins and contains high levels of iron, vitamins and amino acids. Being an alga it provides oxygen and consumes the carbon dioxide exhaled by humans. This reduces the requirement of carrying heavy oxygen tanks in space flights. Thus the correct answer is option B.
Coralloid roots help
Cycas
in
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0%
Fixation and absorption of nitrogen
0%
Absorption of water
0%
Absorption of minerals
0%
Respiration
Explanation
In addition to normal roots,
Cycas
develop specialized organs called coralloid roots.
These roots help them form a mutualistic and symbiotic relationship with cyanobacteria i.e.
Anabaena
allowing nitrogen fixation.
thus, the correct answer is option A.
Gametes fail to fuse in
Chlamydomonas
. The process is
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0%
Isogamy
0%
Anisogamy
0%
Syngamy
0%
None of the above
A character present in coralloid roots and absent in dicot roots is
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0%
Algal zone
0%
Xylem
0%
Cortex
0%
Pith
Neck canal cell is absent in the archegonium of
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0%
Funaria
0%
Cycas
0%
Dryopteris
0%
All pteridophytes
Juvenile state of moss is
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0%
Protonema
0%
Capsule
0%
Prothallus
0%
All the above
Pyrenoids are the centres for formation of
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0%
Proteins
0%
Enzymes
0%
Fat
0%
Starch
Explanation
Pyrenoids are the subcellular micro-compartments or simply the dense bodies present inside the chloroplasts of certain algae and other plants. Pyrenoids are associated with the storage of starch as layers of starch are found to be present around them.
They consist of a central granular core which is proteinaceous and this core is surrounded by starch plates or starch cells. Pyrenoids are also associated with the carbon concentrating mechanism.
So, the correct answer is D.
Algae are included in
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0%
Tracheophytes
0%
Embryophytes
0%
Cormophytes
0%
Thallophytes
Explanation
Thallophytes are a polyphyletic group of non-mobile organisms that are grouped together on the basis of similarity of characteristics, but do not share a common ancestor. They were formerly categorized as a sub-kingdom of kingdom Plantae. These include lichens, algae, fungus, bacteria and slime moulds and bryophytes.
Moss plants develop from
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0%
Oospores
0%
Protonema
0%
Antherozoids
0%
Diploid spores
Explanation
The protonema is an elongated and thread-like structure. This structure develops from the germinated spore of mosses and some liverworts.
This structure forms the earliest stage in the life cycle of the bryophytes.
The protonema then grows and develops to form the leafy gametophytic structure.
Green leafy gametophytic plant is the dominant phase of life cycle of mosses.
Thus, the correct answer is option B.
Chloroplast of
Chlamydomonas
is
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0%
Stellate
0%
Cup-shaped
0%
Collar-shaped
0%
Spiral
Explanation
A single cup-shaped chloroplast is characteristic of Chlamydomonas. It occupies the major portion of cell and is thick at the base while its sides are relatively thin and projected upward.
Hence the correct answer is B.
Meiosis occurs in the zygote of
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0%
Funaria
0%
Chlamydomonas
0%
Dryopteris
0%
Puccinia
Explanation
Chlamydomonas is an example of algae with the haplontic life cycle.
The haplontic life forms produce the gametes through mitosis. After fertilization, a zygote is formed. In the case of Chlamydomonas, zygospore represents diploid zygote.
This zygospore is the only diploid cell in the entire lifecycle. It is thus that same zygospore that later undergoes meiosis to form haploid offspring.
Moss plant is a
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0%
Gametophyte
0%
Sporophyte
0%
Sometimes gametophyte and sometimes sporophyte
0%
Predominantly gametophyte with sporophyte attached to it
Explanation
In mosses, the dominant stage is the haploid generation (the gametophyte).
This means that the green, leafy gametophytic tissue we see in mosses is actually a gametophyte.
Mature sporophytes remain attached to the gametophyte. They consist of a stalk called a seta and a single sporangium or capsule.
So, the correct answer is option A.
Nutrient medium is made semisolid by adding
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0%
Pectin
0%
Agar-agar
0%
Sodium chloride
0%
Water
Floridean starch occurs in
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0%
Myxophyceae
0%
Chloropohyceae
0%
Rhodophyceae
0%
Phaeophyceae
Explanation
Floridian starch is the characteristic photosynthetic reserve substance of red algae, occurring abundantly in certain basin-shaped grain cells.
Most Rhodophyceae store starch outside the chloroplast, often as a cap over a bulging pyrenoid.
The major carbohydrate storage product of red algae is a type of starch molecule (Floridean starch), that is more highly branched than amylopectin. Floridian starch is stored as grains outside the chloroplast.
Thus, the correct answer is option C.
Middle sterile part in the moss capsule is
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0%
Columella
0%
Foot
0%
Spore sac
0%
Protonema
Pyrenoid consists of
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0%
Starch around protein
0%
Protein around starch
0%
Protein only
0%
Starch only
Explanation
Pyrenoids are sub-cellular micro-compartments found in chloroplasts of many algae and in a single group of land plants, the hornworts. A pyrenoid consists of a central protein body surrounded by a starch envelope. The central mass of protein is called pyreno-crystal.
Correct answer is option A.
Which one controls dehiscence of sporangium in
Dryopteris
?
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0%
Annulus
0%
Tapetum
0%
Sorus
0%
Indusium
Pyrenoids are characteristically found in the chloroplasts of
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0%
Angiosperms
0%
Pteridophytes
0%
Algae
0%
Fungi
Explanation
Pyrenoids are sub-cellular micro-compartments found in chloroplasts of many algae, and in a single group of land plants, the hornworts. Pyrenoids are associated with the operation of a carbon-concentrating mechanism (CCM).
Plant body is thallus in
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0%
Gymnosperms
0%
Algae
0%
Bryophyta
0%
Pteridophyta
Explanation
Thallus, plant body of algae, fungi, and other lower organisms formerly assigned to the obsolete group Thallophyta. A thallus is composed of filaments or plates of cells and ranges in size from a unicellular structure to a complex tree-like form. Thus, Option B is correct.
Agar is commercially got from
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0%
Green algae
0%
Blue-green algae
0%
Brown algae
0%
Red algae
Explanation
Agar is a jelly-like substance, obtained from Red algae.
Agar is derived from the polysaccharide agarose, which forms the supporting structure in the cell walls of certain species of algae and which is released on boiling. These algae are known as agarophytes and belong to the Rhodophyta (red algae) phylum. Agar is actually the resulting mixture of two components: the linear polysaccharide agarose and a heterogeneous mixture of smaller molecules called agaropectin. so option D is correct.
Which one helps in spore dispersal in Moss
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0%
Columella
0%
Operculum
0%
Peristome teeth
0%
Apophysis
Vascular bundles are absent in
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0%
Gymnosperms
0%
Angiosperms
0%
Pteridophytes
0%
All the above
Vascular bundles of
Cycas
/
Pinus
stem are
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0%
Conjoint, collateral and closed
0%
Conjoint, collateral and open
0%
Conjoint, bicollateral and open
0%
Conjoint, bicollateral and closed
Which of the following contains non-vascular plants?
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0%
Bryophytes
0%
Pteridophytes
0%
Gymnosperms
0%
Angiosperms
Explanation
Bryophytes are a group of plants that have stem-like and root-like structures but lack the proper vascular tissues: xylem and phloem.
Pteridophytes, gymnosperms, and angiosperms have vascular tissues.
Hence, the correct option is A.
Moss protonema can be differentiated from filamentous alga in
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0%
Multicellularity
0%
Coenocytic nature
0%
Oblique septa
0%
Absence of chloroplasts
Explanation
The protonema of moss differs from filamentous alga in having brown walled cells separated by oblique septa. Both algal filament and protonema contain chloroplast.
So, the correct answer is option C.
Sago of
Cycas
is given to patients with stomach disorders because it is
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0%
Cheap
0%
Easily digestible with less starch
0%
Tastier
0%
With high nutritive values
Cycas
resembles angiosperms in having
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0%
Circinate vernation in leaves
0%
Vessels
0%
Motile sperms
0%
Ovules
An alga rich in proteins is
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0%
Chlorella
0%
Oscillatoria
0%
Ulothrix
0%
Spirogyra
Explanation
Chlorella is an alga with extremely important health benefits. It contains nearly 50% of proteins. It also contains certain essential amino acids. But because of its hard cell wall, it cannot be digested easily. So, it is available in the form of food supplements as tablets, capsules etc.
So, option A "Chlorella" is the correct answer.
Microsporangia occur on the microsporophyll of
Cycas
on
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0%
Abaxial side
0%
Adaxial side
0%
Axils
0%
Margins
Antheridia and archegonia are sex organs of
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0%
Spirogyra
0%
Mucor
0%
Moss
0%
Puccinia
Heterospory and seed habit are exhibited by non-flowering plant which also possesses
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0%
Bract
0%
Ligule
0%
Petiole
0%
Spathe
Moss sporophyte does not possess
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0%
Elaters
0%
Seta
0%
Foot
0%
Columella
Thin-walled nonflagellate spores are
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0%
Zoospores
0%
Aplanospores
0%
Hypnospores
0%
Zygospores
Explanation
Aplanospores are nonmotile thin-walled asexual spores found in certain algae and fungi.
They are formed from a part of a protoplast of a vegetative cell.
Aplanospores consists of a cell wall, which is different from the original parental cell wall, allowing the survival of the organism in harsh conditions. Hence, Thin-walled non flagellated spores are Aplanospores.
So, the correct answer is "Aplanospores'.
Dichotomous branching occurs in
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0%
Liverworts
0%
Funaria
0%
Dryopteris
0%
Pinus
In moss, antheridia and archegonia occur at the tips of two different branches of the same plant. The condition is called
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0%
Monoecious and autoicous
0%
Monoecious and paroicous
0%
Monoecious and synoicous
0%
Dioecious
Explanation
Option 'A' is correct
Monoecious and autoicous means that both the male and female sex organ i.e., artheridia and archegonia are found on same individual or plant (monoicous) but on two different branches of the plant. The sex organs are present at the tips of the branches.
Multiciliated antherozoids occur in
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0%
Riccia
and
Funaria
0%
Pteris
and
Cycas
0%
Riccia
and
Pteris
0%
Marchantia
and
Riccia
Sporogonium of
Polytrichum
possesses
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0%
Foot, seta and capsule
0%
Ribbon shaped thallus
0%
Cordate prothallus
0%
Fleshy thallus
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