Plant Biotechnology MCQs

Question 1

Enhanced axillary branching for multiple shoot production is promoted by

Accepted Answer

2, 4-D

Answer

Abscisic acid

Answer

Gibberellic acid

Answer

Benzyl adenine

Question 2

Shoot organogenesis by tissue culture results into

Accepted Answer

A monopolar structure that has a strong connection with the pre-existing vascular tissue of the explant

Answer

A bipolar structure that has no vascular connection with the explant

Answer

A monopolar structure that has no vascular connection with the explant

Answer

A bipolar structure that has a strong connection with the pre-existing vascular tissue of the explant

Question 3

Determine the correctness or otherwise of the following Assertion [A] and the Reason [R]. Assertion [A]: A zygote and its immediate descendant cells are unspecialized and are called totipotent. Reason [R]: Totipotent cells retain the capacity to differentiate into only a few cell types.

Accepted Answer

[A] is true but [R] is false

Answer

Both [A] and [R] are false

Answer

Both [A] and [R] are true but [R] is not the correct reason for [A]

Answer

Both [A] and [R] are true and [R] is the correct reason for [A]

Question 4

Plant secondary metabolites

Accepted Answer

Provide defense mechanisms against microbial attack

Answer

Help to increase the growth rate of plant

Answer

Help in plant reproduction processes

Answer

Make the plant susceptible to unfavorable conditions

Question 5

Determine the correctness or otherwise of the following Assertion (A) and Reason (R). Assertion: The production of secondary metabolites in plant cell cultures is enhanced by the addition of elicitors. Reason: Elicitors induce the expression of enzymes responsible for the biosynthesis of secondary metabolites.

Accepted Answer

Both (A) and (R) are true and (R) is the correct reason for (A)

Answer

Both (A) and (R) are true but (R) is not the correct reason for (A)

Answer

(A) is true but (R) is false

Answer

(A) is false but (R) is true

Question 6

When present in tissue culture medium, gibberellin

Accepted Answer

Helps to break dormancy of buds and bulbs

Answer

Promotes dormancy development in buds and bulbs

Answer

Is regarded as plant growth inhibitor

Answer

Prevents normal recognition of auxin molecule

Question 7

Callus formation from mature tissue explant occurs through

Accepted Answer

Both A and B of the above

Answer

Dedifferentiation

Answer

Redifferentiation

Answer

Neither A nor B

Question 8

Identify the natural plant growth regulators from the following list. P. Zeatin Q. Benzylaminopurine (BAP) R. Indole-3-acetic acid (IAA) S. 2, 4-Dichlorophenoxyacetic acid

Accepted Answer

P, R

Answer

P, Q

Answer

Q, S

Answer

R, S

Question 9

Which one of the following is the growth factor used for growth of tissues and organs in plant tissue culture?

Accepted Answer

Cytokinin

Answer

Cysteine

Answer

Cytidylate

Answer

Cyclic AMP