Determine the correctness or otherwise of the following Assertion (A) and the Reason (R).Assertion: Cytoplasmic male sterility (cms) is invariably due to defect(s) in mitochondrial function.Reason: cms can be overcome by pollinating a fertility restoring (Rf ) plant with pollen from a non cms plant.

Consider the following statements regarding the germination of pollen grain and choose the correct answer:
1. The content of the pollen is a true male gametophyte
2. The pollen tube comes out due to the protrusion of the exine through the germ pore
3. When the pollen grain has germinated, the pollen tube penetrates the stigma through the stigmatic papillae
4. Some stigmas have a continuous cuticle in which pollen tubes penetrate by enzyme action

A

Only 2, 3 and 4 are true

B

Only 1, 2 and 3 are true

C

Only 1, 3 and 4 are true

D

Only 1, 2 and 4 are true

Plant breeds manipulate sterility and floral morphology to take advantage of hybrid vigour.
Which of the basic methods listed below are utilised for this purpose?
1. Genetic male sterility
2. Self-incompatibility
3. Hybridization
4. Induced mutation
5. Cytoplasmic male sterility
Select the correct answer:

A

1, 2 and 4

B

1, 2 and 5

C

3, 4 and 5

D

All of these

Determine the correctness or otherwise of the following Assertion (A) and the Reason (R).
Assertion: MTT assay is used to determine cell viability based on the principle of color formation by DNA fragmentation.
Reason: MTT assay is used to determine cell viability based on the color development by converting tetrazolium soluble sail to insoluble salt.

A

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

B

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

C

(A) is true but (R) is false

D

(A) is false but (R) is true

Consider the following statements and choose the correct answer:
1. In angiosperms the pollination consists of transference of the pollen grains from the anther to the stigma either by self-pollination or by cross-pollination
2. Pollen grain is shed from the pollen sac in the two-celled stage
3. The exine of each microspore grows out into a tube, called the pollen tube
4. The growth of pollen tube is stimulated by sugary substances secreted by the stigma

A

Only 1, 2 and 3 are true

B

Only 1, 3 and 4 are true

C

Only 1, 2 and 4 are true

D

1, 2, 3 and 4 are true

Determine the correctness or otherwise of the following Assertion (A) and the Reason (R).
Assertion: It is possible to regenerate a whole plant from a single plant cell.
Reason: It is easier to introduce transgenes into plants than animals.

A

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

B

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

C

Both (A) and (R) are false

D

(A) is true but (R) is false

Determine the correctness or otherwise of the following Assertion (a) and Reason (r).
Assertion: During rolling, front tension and (or) back tension are (is) employed to decrease rolling load.
Reason: Roll pressure decreases due to lowering of flow stress as a result of front tension/back tension.

A

a is false but r is true

B

a is true and r is also true, but r is not the reason for a

C

a is true and r is also true, and r is the reason for a

D

a is true but r is false

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.

A

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

B

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

C

(A) is true but (R) is false

D

(A) is false but (R) is true

Determine the correctness or otherwise of the following Assertion (A) and the Reason (R).
Assertion: IgM is found in serum as a pentameric protein consisting of five IgM monomers.
Reason: The pentameric form of IgM is due to cross linking of IgM monomers via peptide bond.

A

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

B

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

C

(A) is true but (R) is false

D

(A) is false but (R) is true

Arrange the following demographic transition theory given by Blackur (ascending order)
1. Declining phase with low mortality, lower fertility
2. Low stationary phases with low fertility and low mortality
3. Early expanding phase marked by high fertility
4. High stationary phase marked by high fertility and mortality

A

1, 2, 3, 4

B

4, 3, 2, 1

C

3, 4, 2, 1

D

1, 3, 2, 4

Determine the correctness or otherwise of the following Assertion (A) and the Reason (R).
Assertion: A very low amount of inhibitor can act as an activator for allosteric enzymes.
Reason: Allosteric enzymes follow Michaelis-Menten kinetics.

A

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

B

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

C

(A) is true but (R) is false

D

(A) is false but (R) is true

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