Tag: biology

Questions Related to biology

Which one of the following structures not found in any class of algae?

plant kingdom biology

  1. Rhizoid and apical cell

  2. Apical cell

  3. Embryo

  4. Thalloid plant body

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Correct Option: A

Choose the correct statement.

plant kingdom biology

  1. Haploid contained of human DNA is4.6$\times{10}^6$bp

  2. A nitrogenous base is linked to pentose sugar through phosphodiester linkage

  3. X-ray diffraction data of Maurice Wilkins and Rosalind Franklin was the basis of Watson and Crick's DNA model

  4. DNA is an acidic substance was first identified by Watson and Crick

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Correct Option: A

Smallest unit in the plant cell wall is

plant kingdom biology

  1. Micelle

  2. Microfibril

  3. Fibril

  4. None of these.

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Correct Option: A

Laminarin and mannitol, the reserve food of brown algae, are

plant kingdom biology

  1. lipids

  2. complex carbohydrates

  3. proteins

  4. lipoproteins

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Correct Option: B
Explanation:

The food in the members of Phaeophyceae is stored as complex carbohydrates in the form of laminarin or mannitol.

Consider the following statements.
a. Ectocaipus has an alternation of isomorphic generations
b. Fucus has no free living haploid generation
c. All red algae are multicellular organisms
d. Brown algae have a few unicellular species
Which of these statements are correct?

plant kingdom biology

  1. $1, 2, 3$ and $4$

  2. $2, 3$ and $4$

  3. $1, 3$ and $4$

  4. $1$ and $2$

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Correct Option: A

Cross between unrelated organisms is

biology food production uses of animals agro-complimentary occupations improvement of crop production

  1. Hybridisation

  2. Heterosis

  3. Test cross

  4. Back cross

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Correct Option: A

Which of the following process is helpful in hybrid seed production?

biology food production uses of animals agro-complimentary occupations improvement of crop production

  1. Embryo rescue

  2. Apomixis

  3. Polyembryony

  4. Somatic hybridisation

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Correct Option: B
Explanation:
  • Apomixis in flowering plants is defined as the asexual formation of a seed from the maternal tissues of the ovule, avoiding the processes of meiosis and fertilization, leading to embryo development. 
  • It plays an important role in hybrid seed production. The method of producing hybrid seeds by cultivation is very expensive for farmers. Also, by sowing hybrid seeds, it is difficult to maintain hybrid characters as characters segregate during meiosis.
  • Apomixis prevents the loss of specific characters in the hybrid. Also, it is a cost-effective method for producing seeds.
  • So, the correct answer is 'Apomixis'.

The nitrogen deficiency of soil can be fulfilled by using the principle of

biology food production uses of animals agro-complimentary occupations improvement of crop production

  1. Crop rotation

  2. Transplantation

  3. Multiple cropping

  4. Broadcasting

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Correct Option: A
Explanation:

Crop rotation is a simple process of growing alternatively legume crops after every cycle of a commercial crop. The leguminous plant have root nodules in which nitrogen fixing bacteria resides which convert atmospheric nitrogen into usable forms by plants and hence increase the fertility of the soil.

Broadcasting is a method of throwing seeds randomly on the soil for germination. Transplantation is the process of uprooting in replanting the plants at some other place. Multiple cropping is growing two or more crops together in the same piece of land in the same season.These cannot help in curing the Nitrogen deficiency of the soil.
Thus, the correct answer is 'Crop rotation.'

A group of animals related by descent and similar in most characters are said to be__________________

biology food production uses of animals agro-complimentary occupations improvement of crop production

  1. Clone

  2. Variant

  3. Breed

  4. Variety

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Correct Option: C
Explanation:

  • The organisms which are related by descent are known as breed. They have most of the characters which are similar. 
  • The general features, characteristics, size, appearance, etc. of these animals resemble each other. 
  • These animals mate or breed with each other in the same breed in order to maintain the pure line breed.
Thus, the correct answer is option C. 

One way of incorporating desirable characters into crop varieties is by 

biology food production uses of animals agro-complimentary occupations improvement of crop production

  1. Fertilization

  2. Leaching

  3. Hybridization

  4. Composting

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Correct Option: C
Explanation:

One way of incorporating desirable characters into crop varieties is by hybridisation. Hybridisation refers to crossing between genetically dissimilar plants.

Thus, the correct answer is option C.