Gentics and Evoloution MCQ question and answer with solution

91

Some plasmids exist in only a very few copies per cell which are said to be

A) Stringent plasmids B) Relaxed plasmids C) F plasmids D) None of the above

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Answer & Solution

Answer: Option A

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92

Three of the 64 amino acid codons do not specify any tRNA and hence are called

A) Silent codons B) Anticodons C) Nonsense codons D) None of the above

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Answer & Solution

Answer: Option C

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93

Parasexual means of recombining somatic nuclei is found in

A) Some fungi and bacteria B) Thallophytes C) Gymnosperms D) Viruses

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Answer & Solution

Answer: Option A

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94

Assertion (A) Mendel worked on garden pea (Pisum sativum).
Reason (R) Garden pea belongs to family-Malvaceae.

A) Both A and R are true and R is the correct explanation of A B) Both A and R are true, but R is not the correct explanation of A C) A is true, but R is false D) A is false, but R is true

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Answer & Solution

Answer: Option C

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95

In which of the following methods of hybridization the recipient parent is crossed to a donor parent?

A) Pedigree method B) Bulk method C) Composite cross method D) Back-cross method

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Answer & Solution

Answer: Option D

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96

Consider the following statements.
1. Use and disuse of organs.
2. Inheritance of acquired characters.
3. Branching descent
4. Natural selection
5. Mutation
6. Reproductive isolation
The two key concepts of Darwinism from the given options are

A) 1 and 2 B) 3 and 4 C) 5 and 6 D) 4 and 6

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Answer & Solution

Answer: Option B

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97

The Oparin-Haldane theory regarding origin of life suggests that

A) Most of the living organisms once originated due to a number of chemical reactions in the earth B) Complex organic molecules would have been formed through a series of chemical reactions in the earth's 'primordial soup' C) Abundant energy must have been available in the form of heat, cosmic rays and lightning to drive the chemical reactions D) Both B and C

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Answer & Solution

Answer: Option D

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98

Which of the following theories suggests that the plants and animals that have inhabited the earth have been changing through millions of years in the different geological periods of the earth's history?

A) The doctrine of descent B) Theory of eternity C) Theory of abiogenesis D) Theory of catastrophism

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Answer & Solution

Answer: Option A

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99

The major functions, which ectomycorrhizae perform, include

A) Absorption of water B) Solubilisation of complex organic molecules into simple organic nutrients, their absorption and transfer to the roots C) Protection of plants from attack of disease-inciting pathogens by secreting antimicrobial substances D) All of the above

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Answer & Solution

Answer: Option D

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100

The unit of heredity in our body is called

A) Chromosome B) DNA C) Gene D) Nucleus

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Answer & Solution

Answer: Option C

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Gentics and Evoloution MCQ question and answer with solution | Biology Gk MCQs