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CBSE Questions for Class 12 Medical Biology Strategies For Enhancement In Food Production Quiz 2 - MCQExams.com
CBSE
Class 12 Medical Biology
Strategies For Enhancement In Food Production
Quiz 2
Breeding of crops with high levels of minerals, vitamins and proteins is called
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Micropropagation
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Somatic hybridisation
0%
Biofortification
0%
Biomagnification
The
indica
varieties of rice is crossed with
japonica
varieties, as these are
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High yielding
0%
Resistant to diseases
0%
Cheaper
0%
Short life-cycled
Aim of plant breeding is to produce
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Disease-free varieties
0%
High yielding varieties
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Early maturing varieties
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All of the above
Piece of sterile plant tissue that is used for tissue culture under aseptic condition is
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0%
Inoculant
0%
Explant
0%
Clone
0%
Somaclone
Explanation
Explant is any portion taken from a plant that will be used to initiate a culture. It can be a portion of the shoot or of the leaves or even just some cells. It is a piece of sterile plant tissue to be used for tissue culture under aseptic conditions.
Inoculant is the active material used in an inoculation.
Clones are organisms that are exact genetic copies.
Somacloning is cloning of plant with a single cell.
Thus, the correct answer is option B.
Sugarcane breeding research institute (SBRI) is situated at
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Lucknow
0%
Coimbatore
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New Delhi
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Shimla
Explanation
'Sugarcane Breeding Institute' is the sugarcane research and development institute located in Coimbatore, India. On the 1st day of April 1932, a sub-station of the 'Sugarcane Breeding Institute', Coimbatore (Tamil Nadu) was established at Karnal (Haryana) with funds provided by the then 'Imperial Council of Agricultural Research' (now the Indian Council of Agricultural Research abbreviated as ICAR).
Thus, the correct answer is option B.
The resistant variety of rice to bacterial blight is ?
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Jaya
0%
TMK-6
0%
IR-20
0%
IR-8
Explanation
The resistant variety of rice to bacterial blight is
IR8 which is a semi-dwarf rice variety developed by the 'International Rice Research Institute' (IRRI). It could produce more grains of rice per plant, when grown with certain fertilizers and irrigation. Thus, option D is correct.
The best way to increase the yield of wheat in India is
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To sow seeds of improved varieties
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To use tractors to till the soil
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To reduce the quantity of ration consumers
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To remove weeds from wheat fields
A plant cell has a potential to develop into the full plant. This property of the plant cell is called ______.
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Tissue culture
0%
Totipotency
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Pleuripotency
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Gene cloning
Explanation
A plant cell has the potential to develop into a complete plant. This property of the plant cell is called totipotency.
The basis of tissue culture is to grow a large number of cells in a sterile controlled environment.
The cells are obtained from the stem, root or other plant parts and are allowed to grow in culture medium containing mineral nutrients, vitamins and hormones to encourage cell division and growth.
As a result, the cells in culture will produce an unorganised proliferative mass of cells which is known as callus tissue, which can be further stimulated to differentiate into an embryo, a process called embryogenesis.
So, the correct answer is option B.
Fishes having swim bladder , which do not have direct
communication with the exterior and where resorbent and
secretory part is not sharply separated from one another are
called as
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Physostomes
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Physoclists
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Euphysoclists
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Paraphysoclists
Explanation
Two type of air bladders are known In the more
generalized groups of teleosts the air bladder retains
connection with the gut via a pneumatic duct, just as in
adenoids and dipping.S uch an open `aibr ladder is called
physostomous. In the teleost Erythrinus the `aibr ladder
has a lateral attachment to gut. Such a closed or
ductless air bladder is called physoclistous.
Which of the following animal can be formed without fertilization?
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Human
0%
Hen
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Honey bee
0%
Ascaris
Explanation
Queen bee is the only fertile female whose primary function is the reproduction. She produces both fertilized and unfertilized eggs. Fertilized eggs will hatch into female worker bees, while unfertilized eggs will become drones or honey bee males.
The number of calves produced during its whole reproductive period of a cow or buffalo is
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8 - 10 calves
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15 - 20 calves
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12 - 16 calves
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5 - 7 calves
Explanation
Cow or buffalo are the milch animal and produces 8 - 10 calves during its productive life time
if a cow is on pasture and well taken care of.
Therefore, the correct answer is option A.
In honeybee, royal jelly is secreted from which of the following gland?
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Crop gland
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Wax gland
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Pharyngeal gland
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Salivary gland
Explanation
Royal jelly is secreted by the hypo-pharyngeal gland (sometimes called as the brood food gland) of young worker (nurse) bees, to feed young larvae and the adult queen bee. Royal jelly is always fed directly to the queen or the larvae as it is secreted; it is not stored.
The life span of a honey bee drone is
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4 - 5 months
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1 - 3 months
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6 - 7 months
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10 - 12 months
Explanation
Honey bees are grouped into three caste fertile queen, sterile female or worker and drones or male for mating. Drones (male bees) are the largest bees in the colony. each hive consists 200- 300 drones and they do not perform useful work for the hive. Drones live for a very short period of about 1 - 2 months. Thus, the correct answer is option B.
Apis dorsata
refers to
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Rock bee
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Little bee
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Indian bee
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European bee
Explanation
Apis dorsata
also called as 'giant honeybee / rock honeybee'. This species is distinctly bigger than the common honeybee, and longer in overall shape. They can look far brighter and more contrasting in colour than the common honeybee.
Himgiri developed by hybridisation and selection for disease resistance against rust pathogens is a variety of
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Wheat
0%
Chilli
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Maize
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Sugarcane
Super-ovulation and embryo transplantation are meant for improving
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Human race
0%
Livestock
0%
Poultry
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Plants
Explanation
Livestock is commonly defined as domesticated animals raised in an agricultural setting to produce labor and commodities such as meat, eggs, milk, fur, leather, and wool.
Multiple ovulation and embryo transfer is the method in which the mother is superovulated to obtain a high number of superior organisms. This is a common practice in cattle and livestock.
The mother is injected with the hormone FSH which results in the production of many eggs which are removed surgically and then in vitro fertilization is performed. The fertilized eggs are cultured till the 16-32 celled stage and then implanted into the uterus of the surrogate mother.
Thus, the correct answer is option B.
Worker bees are
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Sterile females
0%
Fertile females
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When queen is absent then acts as a fertile females
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Sterile drones
Explanation
The worker bees are sterile females and cannot reproduce. They perform all function for the hives and thus, called as worker honey bee. They have the responsibility of maturing honey, feeding the larvae and drones, grooming the queen, cleaning cells, producing wax, pollinating flowers and much more. Hence, option A is correct.
Reproducing plants by cells instead of seeds is called as
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Tissue culture
0%
Amphimixis
0%
Mutation
0%
Breeding
Explanation
Tissue culture is a process that involves exposing plant tissue to a specific regimen of nutrients, hormones, and light under sterile, in vitro conditions to produce many new plants, each a clone of the original mother plant, over a very short period of time.
The term plant tissue culture (micro propagation) is generally used for the aseptic culture of cells, tissues, organs and their components under defined chemical and physical conditions in vitro.
So, the correct answer is option A.
Queen bee is known for ...................
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Administration
0%
Making hive
0%
Egg laying
0%
Collection of food
Explanation
The queen bee is the most valued bee in the whole hive. The main job of queen is to lay eggs. She can lay up to 2,000 per day. Hence, option C is correct.
Life span of worker bee is ................
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0%
10 days
0%
15 days
0%
6 weeks
0%
10 weeks
Explanation
Workers bee are the smallest castes.
The
life span
of an adult
worker bee
varies with the time of the year.
It takes
about twenty one days in their development from egg to adult and w
hen the colony is active in spring and summer, worker bee may live as long as 5-6 weeks. During the inactive period in winter a worker bee lives five months or more.
Hence, option C is correct answer.
Honey is ........ in nature.
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Acidic
0%
Neutral
0%
Alkaline
0%
Basic after some days
Explanation
According to the National
Honey
Board, the
acidity
of
honey
ranges from a pH of about 3.4 to about 6.1, with an average of 3.9.
The acidity of any honey is directly related to the floral sources that created it.
Therefore, honey is acidic in nature (pH range from 1 - 6.9 are acidic in nature). Hence, option A is correct.
Which of the following species of honey bee is reared in artificial hives in India?
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Apis indica
0%
Apis dorsata
0%
Apis florea
0%
Apis colletidae
Explanation
Apis indica
is a species of bee that is commonly found in the regions of India.
This species of bees are reared by constructing artificial beehives.
They are easy to handle and culture artificially in the constructed hives.
Thus, the correct answer is option A.
Honey bee is of greatest use to man due to which reason?
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We get honey from them.
0%
Helps in cross pollination.
0%
Is of medicinal value.
0%
It entertains.
Explanation
The greatest value of the honey bee to man is
in the pollination of flower. Another financial return is from the production of bee wax and honey.
In which of the following bee, wax glands are found?
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0%
Queen bee
0%
Drone
0%
Workers
0%
Both A and C
Explanation
Worker bees, which live only around 35 days in summer, make wax from about the 10th day of their lives to the 16th. When workers are roughly 10 days old, they develop special wax-producing glands in their abdomens. The glands convert the sugar in the honey into wax, which seeps through small pores in the bee’s body leaving tiny white flakes on its abdomen. These bits of wax are then chewed by the bees. The chewed wax is added to the construction of the honeycomb. Hence, option C is correct.
Honeybee after discovering the new source of nectar or honey
can convey this information but
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Cannot convey the direction
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Can convey the direction by round or tail wagging dance
0%
Can convey the direction by round dance only
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Can convey the direction by tail wagging dance only
Explanation
The honey bees exhibit 2 types of dance to communicate the location of food
the round dance and the tail-wagging or waggle dance
.
The round dance is used for food sources 25-100 meters away from the hive or closer. After distributing some of her new-found nectar to waiting bees the scout will begin running in a small circle, switching direction every so often.
The round dance does not give directional information. Bees elicited into foraging after a round dance fly out of the hive in all directions searching for the food source they know must be there.
As the food source becomes more distant the round dance is replaced by the waggle dance.
The waggle dance includes information about the direction and energy required to fly to the goal.
Therefore, the correct answer is option B.
Number of queens in a hive is ...................
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0%
10
0%
15
0%
20
0%
1
Explanation
Commonly one queen is found to be present in each hive and feeds on royal jelly. She is the queen in real sense as the mother of the colony.
In honey bees, the drones (males) are produced from ..................
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Unfertilized eggs
0%
Fertilized eggs
0%
Larvae fed by royal jelly
0%
Fasting larvae
Explanation
The queen after fertilization lays fertilized
and unfertilized eggs both. From unfertilized eggs male bees emerge which are known as drones.
Honey mainly consists of ........................
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Monosaccharides
0%
Disaccharides
0%
Polysaccharides
0%
Fats
Explanation
Honey is composed primarily
of the sugars
glucose
and fructose; its third greatest component is water. It
consists of fructose (45%) and g
lucose (32-37%) that is monosaccharides and because of glucose and fructose, they gets its sweetness. Hence, option A is correct.
The most commonly maintained species of bee by bee-keepers is
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Apis mellifera
0%
Apis dorsata
0%
Apis florea
0%
Apis anthophila
Explanation
Apis mellifera
is a
species
of honey
bee has the high yielding capacity
. It is
frequently maintained
by
beekeepers
for its honey product. T
his species is widely distributed and an important pollinator for agriculture.
Thus, the correct answer is option A.
Which one of the following substances is at its lowest level present in fish food?
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0%
Actin
0%
Myosin
0%
Cholesterol
0%
Tissue fluid
Explanation
Cholesterol is a common sterol found in many animals and some plants. It is present in very less amount in fish flesh.
Therefore, the correct answer is option C.
Isinglass is a type of by product of fish industry which is principally used for .....................
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Feeding cattle, pigs and poultry
0%
Preparation of paints and varnishes
0%
Clarification of vinegar, wines and beer
0%
Production of insulin
Explanation
Isinglass is principally used for clarifying
of wines, bear and making purse, honey comb, book and ribbon. The isinglass prepared in Russia is of best quality in the world.
Choose the minor carp from the following.
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Cyprinus carpio
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Labeo calbasu
0%
Labeo bata
0%
Ctenopharyngodon idella
Explanation
Carps are various species fresh water and oily fish and belong to the family
Cyprinidae
. These are mostly cultured and domesticated in fisheries and aquaculture farms for food and ornamental purpose. The endemic species of carps are divided into two sub-groups: "major carps" and "minor carps".
Labeo bata
is a minor carp is found in India and Bangladesh and is generally cultivated
So, the correct answer is '
Labeo bata
'
Isinglass is prepared from ..................
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0%
Ichthyophis
0%
Musk deer
0%
Fishes
0%
Lizards
Explanation
Isinglass is a transparent, almost pure gelatin prepared from the swim bladder of the sturgeon and certain other fishes such as cat fishes and carps and used as an adhesive and a clarifying agent
. Hence, option C is correct.
Induced breeding is effective in which of them?
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Pisciculture
0%
Sericulture
0%
Apiculture
0%
Lac culture
Explanation
Induced breeding is effective in pisciculture as induced breeding is an artificial process by means of which the extract of the pituitary is introduced into the body of both the matured male and female fishes, then the carps after being excited lay eggs in the pond water and subsequently, fertilization takes place. This process of breeding is also known as hypophysation.
So, the correct answer is option A.
Hinny is a hybrid of male
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Horse and female donkey
0%
Donkey and female horse
0%
Goat and female lamb
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Sheep and female goat
Which of the following two hormones are essential for induced breeding of fishes?
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TSH and ACTH
0%
Oestrogen and progesterone
0%
FSH and LH
0%
Vasopressin and oxytocin
Explanation
Induced breeding of fish is a technique of producing fish by pituitary injectioning. it is a widely accepted economical breeding programme in an artificial way.
Hormone
-
induced spawning
is the only reliable method to induce reproduction in
these fishes
. FSH and LH hormones plays a key role in induced breeding in fishes.
Therefore, the correct answer is option C.
Cod liver oil is extracted from .....................
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0%
Bony fishes
0%
Cartilaginous fishes
0%
Buffaloes
0%
Whales
Explanation
Cod liver oil
, as the name suggests, is the essential oil
extracted from
the livers of Atlantic cod (
Gadus morhua
), cartilaginous fish. The oil is commonly taken as a
dietary supplement. It is one of the best sources of omega-3 fatty acids (EPA and DHA) and contains relatively high amounts of vitamin A and D. Hence, option B is correct.
Estuarian fish culture is a culture of fish in
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0%
Marine water
0%
Fresh water of river
0%
Fresh water of pond
0%
Aquatic medium where fresh and marine water get mixed together
Explanation
Brackish water is the water which is a mixture of salt in water and sea water. It has more salinity than fresh water but not as much as sea water. It is known as estuary. Culturing of fish in this kind of water is called estuary fish culture.
Gambusia
is a ..................
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0%
Predator of mosquito larvae
0%
Parasite on crab
0%
Pathogenic protozoan
0%
Pest on fishes
Explanation
Gambusia affinis
which is also known as mosquitofish is a species of freshwater fish. The name "mosquitofish" was given because the diet of this fish sometimes consists of large numbers of mosquito larvae. Mosquitofish were introduced directly into ecosystems in many parts of the world as a biocontrol to lower mosquito populations. Hence, option A is correct.
What is the main nutritive element in honey
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0%
Disaccharide sugar
0%
Enzymes
0%
Vitamins
0%
All the above
The Indian carp is
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0%
Scoliodon
0%
Labeo
0%
Torpedo
0%
Pristis
Honey bee keeps the nectar for sometime in its
Report Question
0%
Stomach
0%
Salivary gland
0%
Crop
0%
Mouth
The zoological name of honey bee is
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0%
Laccifera
0%
Antheraea
0%
Apis
0%
None of these
The following cells cannot be grown under tissue culture conditions
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0%
Hela cells
0%
Leucocytes
0%
Kidney cells
0%
Nerve cells
Explanation
Nerve cells cannot replicate under Tissue culture conditions hence they cannot be grown by the tissue culture technique.
So the correct option is D.
In India, which state occupies first position in poultry farming
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Kerala
0%
M.P.
0%
Andhra Pradesh
0%
U.P.
The term `aquaculture' means
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0%
Aspergillosis
0%
Marine fisheries
0%
Inland fisheries
0%
(b) and (c) both
Special dance in honey bee is for
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0%
Reproduction
0%
Destruction of enemy bees
0%
Search of food
0%
Convey the information of food source
Explanation
Honey bees performs two type of dances for discovered food source. (1)
Round dance is performed when a newly discovered food source is close to hive. (2) Tail wagging dance is performed for long distance source of food.
Stiffling is related with
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Sericulture
0%
Apiculture
0%
Lacculture
0%
Fishery
Assertion : Sea-faring fishermen sometimes eat raw fish.
Reason : They can be deficient of Vitamin $$B_{1}$$.
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If both the assertion and the reason are true and the reason
is a correct explanation of the assertion
0%
If both the assertion and reason are true but the reason is
not a correct explanation of the assertion
0%
If the assertion is true but the reason is false
0%
If both the assertion and reason are false
0%
If the assertion is false but reason is true
Explanation
Sea faring fisherman suffer from paralysis because raw fish
muscles contain an enzyme which destroys Vitamin$$B_{1}$$
In a bee hive, there are thousands of worker bees performing number of day-to-day activities. Genetically, the worker bees are
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0%
Sterile males.
0%
Fertile males.
0%
Fertile females.
0%
Sterile females.
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