Chapter 6 Control and Coordination

NCERT Class 10th

Science SOLUTIONS

Subject

Question

What are plant hormones?

Updated on July 6, 2025 | By Learnzy Admin | 👁️ Views: 129 students

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Solution

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Plant hormones are natural chemical substances made by plants that help in controlling and coordinating their growth, development, and responses to the environment. They are also called phytohormones.

Main types of plant hormones:

Auxins – Help in growth of stem and bending of plant toward light.
Gibberellins – Help in growth of stems, seed germination, and flowering.
Cytokinins – Help in cell division and growth of new leaves.
Abscisic acid – Stops growth and helps plant survive during stress (like lack of water).
Ethylene – Helps in ripening of fruits.

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More Questions on `Control and Coordination`

Question 1

What is the difference between the manner in which movement takes place in a sensitive plant and the movement in our legs?

Question 2

Compare and contrast nervous and hormonal mechanisms for control and coordination in animals.

Question 3

How are involuntary actions and reflex actions different from each other?

Question 4

What is the need for a system of control and coordination in an organism?

Question 5

How does chemical coordination occur in plants?

Question 6

Which signals will get disrupted in case of a spinal cord injury?

Question 7

How does phototropism occur in plants?

Question 8

What is the function of receptors in our body? Think of situations where receptors do not work properly. What problems are likely to arise?

Question 9

The brain is responsible for (a) thinking. (b) regulating the heart beat. (c) balancing the body. (d) all of the above.

Question 10

The gap between two neurons is called a (a) dendrite. (b) synapse. (c) axon. (d) impulse

Question 11

Which of the following is a plant hormone? (a) Insulin (b) Thyroxin (c) Oestrogen (d) Cytokinin.

Question 12

Why are some patients of diabetes treated by giving injections of insulin?

Question 13

How does our body respond when adrenaline is secreted into the blood?

Question 14

Why is the use of iodised salt advisable?

Question 15

How does chemical coordination take place in animals?

Question 16

How do auxins promote the growth of a tendril around a support?

Question 17

Give an example of a plant hormone that promotes growth.

Question 18

How is the movement of leaves of the sensitive plant different from the movement of a shoot towards light?

Question 19

What is the role of the brain in reflex action?

Question 20

How do we detect the smell of an agarbatti (incense stick)?

Question 21

Which part of the brain maintains posture and equilibrium of the body?

Question 22

What happens at the synapse between two neurons?

Question 23

What is the difference between a reflex action and walking?