Plant Anatomy and Physiology MCQ question and answer with solution

71

A free biradical is almost always produced when

A) A double bond between two carbon atoms is changed to a triple bond B) A triple bond between two carbon atoms is changed to a double bond C) A double bond between two carbon atoms is changed to a single bond D) A single bond between two carbon atoms is changed to a triple bond

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Answer & Solution

Answer: Option C

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72

The nucellus of ovule is surrounded by one or two cellular coats called

A) Columella B) Lamellae C) Integuments D) Chalaza

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Answer: Option C

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73

When reaction proceeds from one direction to another they have to overcome an energy barrier called the

A) Terminal energy B) Activation energy C) Enzymatic energy D) Enthalpy

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Answer: Option B

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74

Match List-I with List-II and select the correct answer:

List-I	List-II
a. Nitrogen	1. Structural element
b. Iron	2. Biocatalytical element
c. Molybdenum	3. Indispensable element
d. Iodine	4. Stimulating element

A) a-2, b-3, c-4, d-1 B) a-3, b-1, c-2, d-4 C) a-1, b-2, c-3, d-4 D) a-2, b-1, c-4, d-3

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Answer: Option C

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75

A grain of maize is infact a dry one-seeded indehiscent fruit of

A) Caryopsis type B) Balausta type C) Sorosis type D) Pome type

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Answer & Solution

Answer: Option A

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76

Rhizobia are known to produce the plant hormone

A) Abscisic acid B) Indole acetic acid C) Glyceric acid D) All of the above

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Answer: Option B

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77

Who among the following considered climax vegetation "as a pattern of populations corresponding to the pattern of environmental gradients"?

A) Whittaker (1953) B) Churchill (1965) C) Odum (1966) D) Penfound (1952)

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Answer: Option A

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78

Consider the following statements.
1. Carbon dioxide, chlorophyll and sunlight all are essential for photosynthesis.
2. Rate of photosynthesis is maximum in red light and minimum in green light.
3. Increase in O₂ concentration decrease photosynthesis.
Which of the statements given above is/are correct about photosynthesis ?

A) 1, 2 and 3 B) 1 and 3 C) 1 and 2 D) 2 and 3

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Answer: Option A

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79

Which of the following is an example of bound auxin?

A) Indole-3-acetaldehyde B) Indole-3-acetonitril C) Glucobrassicin D) Indole-3-ethanol

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Answer: Option C

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80

There is extreme reduction in roots and analogous organs; some are rootless, when roots are present, they are without root hairs because water and nutrient salts may be absorbed by the entire permeable plant surface under water. These adaptations belong to

A) Free floating hydrophytes B) Rooted hydrophytes with floating leaves C) Rooted submerged hydrophytes D) Rooted and immersed hydrophytes

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Answer & Solution

Answer: Option C

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Plant Anatomy and Physiology MCQ question and answer with solution | Biology Gk MCQs