Home
Class 12
BIOLOGY
Which statements are correct ? a - Cyt...

Which statements are correct ?
a - Cytokinins suppress the synthesis of chlorophyll
b - Auxins control apical dominance
c - Gibberellins promote shoot elongation
d - Abscisic acid enables seeds to with-stand desiccation.

A

a and b only

B

b and c only

C

a and c only

D

b, c and d only

Text Solution

AI Generated Solution

The correct Answer is:
To determine which statements are correct regarding plant hormones, let's analyze each statement one by one. ### Step-by-Step Solution: 1. **Statement a: Cytokinins suppress the synthesis of chlorophyll.** - **Analysis:** This statement is incorrect. Cytokinins are known to promote cell division and delay the degradation of chlorophyll, thereby enhancing chlorophyll synthesis rather than suppressing it. - **Conclusion:** **Incorrect.** 2. **Statement b: Auxins control apical dominance.** - **Analysis:** This statement is correct. Auxins are plant hormones that are primarily responsible for promoting cell elongation and are produced at the tip of the shoot. They play a crucial role in maintaining apical dominance, which is the phenomenon where the main central stem of the plant grows more strongly than the side stems. - **Conclusion:** **Correct.** 3. **Statement c: Gibberellins promote shoot elongation.** - **Analysis:** This statement is also correct. Gibberellins are a group of plant hormones that promote various growth processes, including shoot elongation. They are involved in processes such as seed germination and the growth of stems. - **Conclusion:** **Correct.** 4. **Statement d: Abscisic acid enables seeds to withstand desiccation.** - **Analysis:** This statement is correct as well. Abscisic acid (ABA) is known as the stress hormone and helps plants cope with stress conditions, including drought. It plays a vital role in enabling seeds to withstand desiccation (drying out). - **Conclusion:** **Correct.** ### Final Answer: The correct statements are: **b, c, and d.**
Promotional Banner

Topper's Solved these Questions

  • Plant Growth and Movements

    DINESH PUBLICATION ENGLISH|Exercise CYG|20 Videos

  • Plant Growth and Movements

    DINESH PUBLICATION ENGLISH|Exercise BRAIN TEASERS-IV|41 Videos

  • Plant Growth and Movements

    DINESH PUBLICATION ENGLISH|Exercise BRAIN TEASERS-IV|41 Videos

  • PLANT BREEDING AND DISEASE CONTROL

    DINESH PUBLICATION ENGLISH|Exercise Check your Grasp|10 Videos

  • PLATYHELMINTHES-THE FLAT WORMS

    DINESH PUBLICATION ENGLISH|Exercise check your grasp|9 Videos

Similar Questions

Explore conceptually related problems

The following statements are given about different plant growth hormones : I. Cytokinin suppresses the synthesis of chlorophyll. II. Auxins control apical dominance. III. Gibberellins promote shoot elongation. IV. Abscisic acid enables seeds to withstand desication. Which of the above statements are correct?

Pick up correct statements (A) Cytokinins delay senescence (B) Auxin regulate apical dominance (C) Ethylene enhances seed germination (D) Gibberellins cause falling of immature leaves.

Abscisic acid controls (a) Cell elongation and cell wall formation (b) Shoot elongation (c) Leaf fall and dormancy (d) Cell division

Which of the following statements are correct ? (a) Cortisol suppresses the immune response (b)Thyroxine supports the process of red blood cell formation (c) Glucagon stimulates glycogenesis process (d) Androgens stimulate muscular growth, aggressiveness, high pitch of voice.

Read the given statements about auxins and state whether they are true or false : a. Auxin promotes apical dominance. b. Auxins have a negative impact on cytokinin levels. c. F.W went isolated auxins from the coleoptiles of the coleptiles of the oat plant. d. Auxin promotes flowering in the pineapple plants.

Select the activites associated with gibberellins (a) Apical dominance (b) Good herbicides (c) Promote bolting (d) Delay senescence (e) Stimulate closure of stomata.

How many of the given statements are correct w.r.t meristmatic tissues? A. The meristems which occur at the tips of roots and shoots are primary meristems. B. Some cells 'left behind ' from the shoot apical meristem constitutes the accessory bud. C. Cork cambium is responsible for producing secondary tissues. D. The process of formation of structurally and functionally specialised cells is known as dedifferentiation. E. The intercalary meristem occurs in grasses and regenerates parts removed by grazing herbivore. F. Interfascicular cambium and fascicular vascular cambium are absent in woody plant axis.

Phytohormone commonly called stress hormone is (a) Auxin (b) Abscisic acid (c) Gibberellin (d) Cytokinins

A phytohormone involved in the de novo synthesis of alpha -amylase in germinating seeds is (a) Auxin (b) Gibberellin (c) Ethylene (d) Cytokinin

Among the given statements identify the correct statements, a. RNA takes part in synthesis of proteins, b. Proteins essentially contain sulphur, phosphorus, hydrogen & oxygen, br c. Nitrogen is less common component of protein. Br d. Peptide bonds formed by dehydration synthesis bind amino acids in formation of protein, e. Proteins on hydrolysis yield fatty acids.