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 Multiple Choice QuestionsMultiple Choice Questions

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1.

In honey bee, royal jelly is secreted from :

  • corp gland

  • wax gland

  • pharyngeal gland

  • salivary gland


C.

pharyngeal gland

In honey bees, royal jelly is secreted from pharyngeal gland of the workers. First two days all larvae of queen bees regularly fed on royal jelly.


2.

Somaclonal variation appears in

  • organisms produced through somatic hybridization

  • plants growing in highly polluted conditions

  • apomictic plants

  • tissue culture raised plants


D.

tissue culture raised plants

Somaclonal variations is the variation seen in plants that have been produced by plant tissue culture. Chromosomal rearrangements are an important source of this variation. It could be genotypic or phenotypic.


3.

Assertion : In plant tissue culture, somatic embryos can be induced from any plant cell.

Reason : Any viable plant cell can differentiate into somatic embryos.

  • If both Assertion and Reason are true and the reason is the correct explanation of the assertion

  • If both Assertion and Reason are true but the reason is not the correct explanation of the assertion

  • If Assertion is true statement but Reason is false

  • If both Assertion and Reason are false statements


A.

If both Assertion and Reason are true and the reason is the correct explanation of the assertion

Any viable somatic cell of a plant has the ability to form full fledged plants. This ability of plant cell is known as cellular totipotency. Therefore, it is defined as the ability of a single cell to divide and produce all of the differentiated cells in an organisms.


4.

Genetic diversity in agricultural crops is threatened by

  • introduction of high yielding varieties

  • intensive use of fertilizers

  • extensive intercropping

  • intensive use of biopesticides


A.

introduction of high yielding varieties

Genetic diversity in agricultural crop is threatened by the introduction of high yielding varieties as they heve the required traits and hence always are bred purely. This eliminates other crop/ variety from the pool.


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5.

The map given below indicates the Former and the present distribution of an animal. Which animal could it be:

  • Wild ass

  • Nilgai

  • Black buck

  • Lion


A.

Wild ass

The wild ass, once widely distributed north-western arid zone; now confined to Runn of Kutchchh and Pakistan. Indian Wild Ass Santuary is located in Gujarat state of India. It is spread over 4954 km2. And it is the largest wildlife sanctuary in India.


6.

Assertion: Fish meal is a rich source of protein for cattle and poultry.

Reason: Fish meal is produced from non-edible parts of fishes like fins, tail etc.

  • If both Assertion and Reason are true and Reason is the correct explanation of Assertion

  • If both Assertion and Reason are true but Reason is not the correct explanation of Assertion

  • If Assertion is true but Reason is false

  • If both Assertion and Reason are false.


C.

If Assertion is true but Reason is false

Fish meal consists of wastes of fish oil or canning industry or from the whole fish of non-oil type. The protein content of this meal is highly digestable, nutritive and of biological importance. Fish meal is also used for domestic animals like pigs, poultry. cattle etc.


7.

Assertion: The honey bee queen copulates only once in her life time.

Reason: The honey bee queen can lay fertilized as well as unfertilized eggs.

  • If both Assertion and Reason are true and Reason is the correct explanation of Assertion

  • If both Assertion and Reason are true but Reason is not the correct explanation of Assertion

  • If Assertion is true but Reason is false

  • If both Assertion and Reason are false.


B.

If both Assertion and Reason are true but Reason is not the correct explanation of Assertion

Queen is the only fertile female in beehive, having immensely developed ovaries. She lives for several successive years laying about 2000 or more eggs a day and upto about 1,500000 eggs during her life time. The queen has a remarkable capacity of controlling the fertilization of its eggs. A fertilized egg is laid in a worker or queen cell or honey comb, while an unfertilized egg in a drone cell, the latter develops parthogenetically. The queen mates only once in a life time. The sperms stored in her spermatheca fertilize her eggs as long as she lives.


8.

Which is social foresting species

  • Leucaena leucocephala

  • Tectona grandis

  • Mangifera indica

  • Rosa indica


A.

Leucaena leucocephala

Leucaena leucocephala is commonly known as subabool. It is a very fast growing leguminous plant and therefore is commonly used as social foresting species.


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9.

Assertion : Use of fertilizers greatly enhances crop productivity.

Reason : Irrigation is very important in increasing crop productivity.

  • If both Assertion and Reason are true and the reason is the correct explanation of the assertion

  • If both Assertion and Reason are true but the reason is not the correct explanation of the assertion

  • If Assertion is true statement but Reason is false

  • If both Assertion and Reason are false statements


B.

If both Assertion and Reason are true but the reason is not the correct explanation of the assertion

Fertilizers are chemical compounds applied to promote plant growth. They are either applied to the soil or by foliar feeding. They mainly increase the crop yield. Average yield per hectare has increased from 1.1 tons in 1950 to 2.3 tons in 1986 by the use of inorganic fertilizers.

Irrigation is very important in increasing crop productivity as water is an essential component of vital activities of a plant.


10.

Which one is not produced by aquaculture?

  • oyster

  • silkworm

  • singhara

  • frog


B.

silkworm

Sericulture is the cultivation of silkworms to produce silk.

Aquaculture is the farming of fish, crustaceans, molluscs, aquatic plants, algae and other organisms. Therefore, rearing of oyster, singhara and frog is mainly done by aquaculture.


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