Yes, it is correct. The endocrine system works closely with the nervous system in regulating certain activities of the body by secreting hormones directly into the bloodstream.

The age at which the reproductive system becomes functional is called puberty. The human body undergoes several changes during adolescence,  which marks the onset of puberty.

Yes, it is correct. Testosterone is the male sex hormone. 

A human body has 23 pairs of chromosomes, out of which 22 pairs are autosomes and 1 pair is the sex determining pair.

The beginning of the menstrual cycle is an indicator of the beginning of the reproductive age in females.

Chromosomes that do not take part in the determination of sex are called autosomes. There are 22 pairs of autosomes in a human. This is the correct option. A human being has 22 pairs of autosomes and only 1 pair of allosomes.

Sex chromosomes in sperms determine the baby’s gender. Allosomes are the sex chromosomes.

This is the correct option. Endocrine glands are glands of the endocrine system that secrete their products, hormones directly into the blood rather than through a duct.

Yes, it is the correct answer. A mammary gland is an organ in female mammals that produces milk to feed young offspring. Mammals get their name from the word mammary. In humans, the mammary glands are situated in the breasts. In ruminants such as cows, goats, and deer, the mammary glands are contained in the udders. These are exocrine glands.

Human females have two of the same kind of sex chromosomes (XX), while males have two distinct sex chromosomes (XY). The XY chromosomal cells create testosterone and anti-müllerian hormone to turn the genderless sex organs into male. With females, their cells excrete estrogen, driving the body down the female pathway. Thereby, determining the sex of the baby.

The endocrine glands secrete them in small amounts.

Endocrine glands are glands without ducts. Exocrine glands are glands with ducts. Pituatory glands secrete growth hormones. Hence, option (2) is correct.

This is the correct option as all the above statements are correct

The shedding of the uterine thickening along with its blood vessels is known as menstruation.

Thyroxine hormone regulates carbohydrate, protein and fat metabolism in the body so as to provide the best balance for growth. It has influence over physical and mental development of an individual.

A gamete is a mature reproductive cell - a sperm or an ovum. This is the correct option.

The first menstrual flow begins at puberty and is called menarche.

The adrenal gland controls the stress hormones cortisol and epinephrine. The stress hormones act by mobilizing energy from storage to muscles, increasing heart rate, blood pressure and breathing rate and shutting down metabolic processes such as digestion, reproduction, growth and immunity.

The reason why many adolescents get acne and pimples at the time of puberty is because of increased activity of sebaceous or oil and sweat glands.

This is the correct option. The thyroid gland is situated at the base of the neck, in front of the windpipe. The adrenal glands are two, situated on top of the kidneys. The pancreas are situated below the stomach. The pituatory glands are situated at the base of the brain.