Reaching the age of adolescence

The given diagram shows the production of sperm cells in humans.

Cell A is a normal body cell.

How many chromosomes are there in cell A?

• 46

• 46 pair

• 23

• 23 pair

The given diagram shows the production of sperm cells in humans.

How many chromosomes are there in cell E?

• 23

• 23 pair

• 46

• 46 pair

Name the hormone in females that is produced by ovaries and helps in the development of mammary glands.

• Estrogen

• Testosterone

• Thyroxine

• Adrenalin

Why do boys have a hoarse voice at puberty?

• Due to the sex hormones.

• Due to the development of Adam's apple.

• Due to the excessive vibration of vocal cords.

• The larynx grows and protrudes out which can be seen as Adam's apple.

AIDS is a set of symptoms and illnesses that develops at the final stage of HIV infection if left untreated.

Write the ways by which it is transmitted.

• from the infected mother through her milk.

• through sexual contact with an infected person.

• by sharing the syringes for injecting drugs used by an infected person.

• All the above

What will be the sex of the individual with sex chromosomes as XY?

• Boy

• Girl

• Neither boy nor girl

• None of the above

Locate the gland that helps the body to adjust to stress.

• C

• D

• E

• F

The hormones released from this gland stimulate other glands to release their hormones.

• Thyroid.

• Pituitary.

• Adrenal.

• Thymus.

Which hormone is secreted by the gland ‘F’?

• Thyroxine

• Insulin

• Adrenaline

• Testosterone

Which of these is true of the endocrine system?

• secretes hormones that are transported to target cells by blood

• causes changes in metabolic activities

• effects are prolonged

• All of the above is true.