NCERT Class X Science Class: Chapter –7. Control and Coordination – Part-5

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Question 26:

Which statement is not true about thyroxin?

(a) Iron is essential for the synthesis of thyroxin

(b) It regulates carbohydrates, protein and fat metabolism in the body

(c) Thyroid gland requires iodine to synthesise thyroxin

(d) Thyroxin is also called thyroid hormone

Answer: A

Question 27:

Dwarfism results due to

(a) Excess secretion of thyroxin

(b) Less secretion of growth hormone

(c) Less secretion of adrenaline

(d) Excess secretion of growth hormone

Answer: B

Image Figure shown the dwarfism

Image Figure Shown the Dwarfism

Question 28:

Dramatic changes of body features associated with puberty are mainly because of secretion of

(a) Estrogen from testes and testosterone from ovary

(b) Estrogen from adrenal gland and testosterone from pituitary gland

(c) Testosterone from testes and estrogen from ovary

(d) Testosterone from thyroid gland and estrogen from pituitary gland

Answer: C

Question 29:

A doctor advised a person to take an injection of insulin because

(a) His blood pressure was low

(b) His heart was beating slowly

(c) He was suffering from goiter

(d) His sugar level in blood was high

Answer: D

Image the insulin is made in the pancreas

Image the Insulin is Made in the Pancreas

Question 30:

The hormone which increases the fertility in males is known as

(a) Estrogen

(b) Testosterone

(c) Insulin

(d) Growth hormone

Answer: B

Image hormone the fertility in males Testosterone

Image Hormone the Fertility in Males Testosterone

Question 31:

Which of the following endocrine glands is unpaired?

(a) Adrenal

(b) Testes

(c) Pituitary

(d) Ovary

Answer: C

Image pituitary gland

Image Pituitary Gland

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