General
✓✗Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): Gibberellins are used to increase the yield of sugarcane.
Reason (R): Gibberellins increase the length of the stem, and sugarcane stores carbohydrate as sugar in its stems.
In the light of the above statements, choose the correct answer from the options given below.
Assertion (A): Gibberellins are used to increase the yield of sugarcane.
Reason (R): Gibberellins increase the length of the stem, and sugarcane stores carbohydrate as sugar in its stems.
In the light of the above statements, choose the correct answer from the options given below.
- Both Assertion and Reason are true and Reason is the correct explanation of Assertion
- Both Assertion and Reason are true but Reason is not the correct explanation of Assertion
- Assertion is true but Reason is false
- Both Assertion and Reason are false
General
✓✗Which of the following is not an effect of abscisic acid?
- Promotion of seed germination
- Inhibition of plant metabolism
- Stimulation of stomatal closure
- Induction of seed dormancy
General
✓✗Secondary xylem and secondary phloem formed by interfascicular cambium are products of
- senescence
- dedifferentiation
- redifferentiation
- abscission
General
✓✗Kinetin is chemically a modified form of
- adenine
- tryptophan
- guanine
- uracil
General
✓✗Two seedlings, X and Y, start with dry weights of 1 g and 4 g. Both grow exponentially with the same relative growth rate. After the same time, which statement is correct?
- Both seedlings gain exactly the same absolute weight.
- Both increase by the same factor, but Y gains more weight.
- X gains more absolute weight than Y in the same time.
- Y increases by a larger factor than X in the same time.
General
✓✗Growth in plants is generally accompanied by
- a fall in the total protoplasm
- a loss of cells from meristems
- a decrease in dry weight only
- metabolic processes that use energy
General
✓✗Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): The growth curve of most living organisms in their natural environment is sigmoid.
Reason (R): Limited nutrient availability does not allow exponential growth to continue for long.
In the light of the above statements, choose the correct answer from the options given below.
Assertion (A): The growth curve of most living organisms in their natural environment is sigmoid.
Reason (R): Limited nutrient availability does not allow exponential growth to continue for long.
In the light of the above statements, choose the correct answer from the options given below.
- Both Assertion and Reason are true and Reason is the correct explanation of Assertion
- Both Assertion and Reason are true but Reason is not the correct explanation of Assertion
- Assertion is true but Reason is false
- Both Assertion and Reason are false
General
✓✗Abscisic acid plays an important role in
- root growth and root hair formation
- seed development, maturation and dormancy
- bolting of cabbage and elongation of grape stalks
- fruit ripening and degreening of citrus
General
✓✗Development in plants is under the control of
- only plant growth regulators
- both intrinsic and extrinsic factors
- only the genes of the plant
- only light and temperature
General
✓✗Which of the following can undergo dedifferentiation?
- Mature dead vessel members
- Dead sclerenchyma fibres
- Dead tracheids of xylem
- Living parenchyma cells
General
✓✗Which of the following is part of development but is not a measure of growth?
- Increase in dry weight
- Differentiation of cells into tissues
- Increase in length
- Increase in cell number
General
✓✗Match List I with List II.
Choose the correct answer from the options given below.
| List I (factor) | List II (role in growth) |
| A. Water | I. Raw material for protoplasm and source of energy |
| B. Oxygen | II. Releases metabolic energy |
| C. Nutrients | III. Every plant has an optimum range |
| D. Temperature | IV. Cell enlargement and turgidity |
- A-I, B-II, C-IV, D-III
- A-IV, B-II, C-I, D-III
- A-IV, B-I, C-II, D-III
- A-II, B-IV, C-I, D-III
General
✓✗Given below are two statements.
Statement I: Plant growth regulators are intrinsic factors that control development.
Statement II: Light and temperature are intrinsic factors that control development.
In the light of the above statements, choose the correct answer from the options given below.
Statement I: Plant growth regulators are intrinsic factors that control development.
Statement II: Light and temperature are intrinsic factors that control development.
In the light of the above statements, choose the correct answer from the options given below.
- Both Statement I and Statement II are correct
- Both Statement I and Statement II are incorrect
- Statement I is correct but Statement II is incorrect
- Statement I is incorrect but Statement II is correct
General
✓✗Which of the following PGRs is a growth promoter?
- Abscisic acid
- Dormin
- Gibberellin
- Inhibitor-B
General
✓✗2,4-D is widely used to kill
- insects
- monocotyledonous crops
- dicotyledonous weeds
- fungi