Control and Coordination

What is reflex action? Explain the mechanism of reflex action with a suitable example.

(a) What are “hormones”?

(b) List four characteristics of hormones

(c) Name the hormone required for the following:

Functioning of mammary glands

Regulation of calcium and phosphate

Lowering of blood glucose

Development of moustache and beard in human malc.

Name two hormones secreted by pancreas. Write one function of each hormone named.

Maintenance of Posture and Equilibrium. Cerebellum.

(a) Distinguish between voluntary and involuntary actions of our body.

(b) Choose involuntary actions, amongst the following:

Reading, Beating of heart, Salivation in the mouth on viewing tasty food, Talking.

(a) What is

• Phototropism and
• Geotropism?

With labelled diagrams describe an activity to show that light and gravity change the direction that plant parts grow in.

(b) Mention the role of each of the following plant hormones:

• Auxin

· Abscisic acid.

Write the function of hormone thyroxine in our bodies.

What are nastic and curvature movements? Give one example of each.

Name the three major regions of human brain. Which part of brain maintains posture and equilibrium of the body?

What are phytohormones?

What is neuron?

Explain the cause of shoots of the plant bending towards light?

Name the hormone responsible for regulation of

• Metabolism of carbohydrates, fats and proteins
• Balance of calcium and phosphate
• Blood pressure
• Water and electrolyte balance.