Q4 of 36 Page 261

A. Write the names of five endocrine glands found in the human body. Name the hormones secreted by each gland.

B. Name the gland which controls the secretion of hormones of pituitary gland.


C. How does our body response when adrenaline is secreted in large amounts into the blood?


D. Name the disease which occurs in adults due to the deficiency of iodine in the diet. What is the main symptom of this disease ?

(A)


(B) Hypothalamus gland controls the secretion of hormones of pituitary gland.


(c) When adrenaline hormone is secreted in large amount into the blood, it raises the heartbeat and blood-pressure, due to which more glucose go into the blood. Thus the glucose provides energy to fight back in a situation. This is why it is also known as emergency hormone.


(D) Goitre is the disease which occurs in adults due to deficiency of iodine in the diet.


The main symptom is the enlargement of the thyroid gland.


Diagram showing the disease of goitre. It is caused due to the deficiency of iodone.



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4

A. What is meant by ‘tropisms’ ? Explain with an example.

B. Mention types of tropisms. Define each type of tropism. Write the name of stimulus in each case.


C. How do tropism differ from nastism?

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A. Define phototropism and give one example of it.

B. How does phototropism occur in a plant stem ? Explain with the help of labelled diagrams.


C. What is meant by positive phototropism and negative phototropism? Give one example of each type.

 4

A. Name the structural and functional unit of nervous system.

B. What is autonomous nervous system? What is its function?


C. What is voluntary nervous system? Explain the working of voluntary nervous system with an example.

 4

A. What is a reflex action? Explain with the help of an example.

B. How involuntary actions and reflex actions differ from each other?