Tag: biology

Questions Related to biology

Choose the correct answer from the alternatives given.
An example for enucleated cell in plants is:

types of endosperms plant kingdom biology

  1. parenchyma cell

  2. meristematic cell

  3. tracheid

  4. a mature sieve tube cell

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Correct Option: D

When a heterozygous maize plant with coloured and full endosperm seed is crossed to a plant with colourless and shrunken seeds , in the progeny 480 colored full endosperm seed containing 20 colored shrunken seed containing and 20 colorless and full endosperm seed containing plants are produced What is the percentage of rfecombination?

types of endosperms plant kingdom biology

  1. 96

  2. 4

  3. 50

  4. 2

Show answer
Correct Option: A
Explanation:

When a heterozygous maize plant with coloured and full endosperm seed is crossed to a plant with colourless and shrunken seeds. In the progeny 480 coloured full endosperm seed containing 20 coloured shrunken seed containing and 20 colourless and full endosperm seed containing plants are produced. The percentage of recombinants are 38%. 

no option

Choose the correct answers from the alternatives given.
Scutdllum is

types of endosperms plant kingdom biology

  1. a protective covering of the radicle

  2. a protective covering of the plumule

  3. an endosperm

  4. a shield-shaped cotyledon

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Correct Option: D

Choose the correct answers from the alternatives given.
The perisperm is the remaining

types of endosperms plant kingdom biology

  1. nucellus

  2. endosperm

  3. female gametophyte

  4. integument

Show answer
Correct Option: A
Explanation:
Perisperm nutritive tissue of seed derived from the nucellus and deposited externally to the embryo sac distinguished from the endosperm. A layer of nutritive tissue in the seed of certain flowering plants that are derived from the nucellus and surrounds the embryo. In seeds of some plants remnants of nucellus is persistent. This residual, persistent nucellus is called perisperm.
So, the correct option is, 'nucellus'.

Which of the following agricultural practices keeps the fields free for a season allowing replenishment of the lost nutrients?

biology fertility of the soil patterns of cropping rotation of crops cropping patterns common irrigation systems

  1. Monocropping

  2. Crop rotation

  3. Multiple cropping

  4. Field fallow

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Correct Option: D
Explanation:

The farm land is ploughed and then not used for the cultivation of the crops for some time. This helps in the land to gain the fertility again and the method is known as field fallow. This provides the land some time to replenish its nutrients so that the next round of crops can grow properly.

Thus, the correct answer is option D. 

Which of these is/are the advantages of crop rotation?

biology fertility of the soil patterns of cropping rotation of crops cropping patterns common irrigation systems

  1. It prevents the depletion of selective nutrients

  2. It prevents the building up of diseases and pests of a particular crop

  3. It enhances the production by increasing the soil fertility

  4. All of the above

Show answer
Correct Option: D
Explanation:

The crop rotation is a pattern of growing a series of different types of crops in the same area in the sequential season. It is a method of replenishment of nutrients by the regular succession over the same field. It enhances the health of crops and minimizes the amount of pest. Thus, the correct answer is option D.

Which cropping method involves the successive growing of different crops in the same field in a definite pattern?

biology sustainable agriculture patterns of cropping rotation of crops cropping patterns common irrigation systems

  1. Mixed cropping

  2. Crop rotation

  3. Inter cropping

  4. Mixed farming

Show answer
Correct Option: C
Explanation:

Intercropping is the practice of growing two or more crops on the same piece of land in alternate rows. It increases the land productivity and acts as an insurance for the farmers during the crop failure.

So, the correct answer is option C.

Which cropping method involves growing two or more crops in definite row pattern?

biology sustainable agriculture patterns of cropping rotation of crops cropping patterns common irrigation systems

  1. Intercropping

  2. Mixed farming

  3. Mixed cropping

  4. Crop rotation

Show answer
Correct Option: A
Explanation:

Intercropping is a cropping practice that involves growing two or more crops in proximity in different rows. This practice of cultivating different crops gives higher income than the sole cropping. Intercropping maintains the soil fertility and reduces the soil runoff. 

Thus, the correct answer is option A. 

Which of these statements is true about intercropping?

biology sustainable agriculture patterns of cropping rotation of crops cropping patterns common irrigation systems

  1. Seeds of two crops are mixed before sowing.

  2. Harvesting and thrashing are not possible separately.

  3. Maximum utilisation of nutrients supplied.

  4. There are set pattern of rows of crops.

Show answer
Correct Option: D
Explanation:

Intercropping is growing two or more crops simultaneously in the same field in a definite pattern which avoids the competition between both the crops. The sowing time of crops in this pattern may be the same or different.

Which of the following terms is used for raising both plant crop and livestock on farm?

biology sustainable agriculture patterns of cropping rotation of crops cropping patterns common irrigation systems

  1. Mixed farming

  2. Intercropping

  3. Monocropping

  4. Crop rotation

Show answer
Correct Option: A
Explanation:

Mixed farming is a method of agriculture which involves cropping as well as raising livestock. For example growing of cereal crops with cattle farming as cattle excrete nitrogenous waste that can be used as manure for cereals whereas waste from crops is used as fooder and reduces the use of artificial fertilizers.