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Plant Hormones

Identify the ...

Question

Identify the plant hormone ‘X’ from the given statements
and select the correct option regarding it.
I. It promotes cell division in plants.
II. It helps in breaking dormancy of seeds.
III. It delays the ageing in leaves.
IV. It brings about morphogenesis along with auxin during tissue culture.

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Solution

Cytokinins are known to delay senescence in leaf tissues, promote mitosis, and stimulate differentiation of the meristem in shoots and roots.

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Q. Choose the right from the following.
(i) In light, hormone auxin, helps the cells to grow longer in plants.
(ii) Plant hormone gibberellins help in growth of a stem.
(iii) Cytokinin inhibits cell division.
(iv) Abscisic acid promotes growth in plants.

Q. Q. Which of the following pairs is/are correctly paired?

Plant Hormone	Functions
1. Auxin	Helps in the growth of plant tissue.
2. Cytokinin	Promotes cell division, delays aging of cells.
3. Ethylene	Inhibits growth and causes wilting of leaves, promoting dormancy of buds.
4. Gibberellin	This is a gaseous hormone that causes the ripening of fruits.

Select the correct answer using the codes given below:

Q. Scientists use various combinations of auxin and cytokinin in plant tissue culture experiments. Choose the correct statement from the options given below regarding the role of both hormone in plant culture medium.

Q. Which of the following statements regarding ethylene is/are correct?
I. Ethylene influences the growth of seeds and seedlings.
II. It helps in breaking the dormancy of seeds.
III. It promotes the formation of apical hook in dicots, germination and horizontal growth of seedlings.

Q. Read the given statements and identify the plant hormones X, Y and Z.
(i) Hormone Y suppresses flowering in mango and also promotes rapid internode/petiole elongation in deep water rice plants and hence helping leaves or upper part of shoot to remain above water.
(ii) Hormone X promotes root growth and root hair formation.
(ii) Hormone Z inhibits the seed germination, increases the tolerance of plant to various stresses, play important role in seed development maturation and dormancy.

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