Puberty And Menstrual Cycle

Explanation
Day 1 of the menstrual cycle is when menstruation starts. Menstruation is the shedding of the uterine lining, which occurs when an egg released during the previous cycle is not fertilized. This marks the beginning of a new menstrual cycle.

Explanation
During ovulation, only one egg is typically released from the ovary. This process occurs once a month in women of reproductive age. The released egg then travels down the fallopian tube, where it can potentially be fertilized by sperm if sexual intercourse occurs. If fertilization does not occur, the egg will disintegrate and be expelled during menstruation. Therefore, the correct answer is 1.

Explanation
The menstrual cycle is controlled by hormones. Hormones like estrogen and progesterone play a crucial role in regulating the menstrual cycle. These hormones are produced by the ovaries and help in the development and release of eggs from the ovaries. They also regulate the thickening and shedding of the uterine lining during menstruation. Additionally, hormones from the pituitary gland, such as follicle-stimulating hormone (FSH) and luteinizing hormone (LH), also play a part in controlling the menstrual cycle.

Explanation
After menstruation, the uterus lining starts to build up again. During menstruation, the uterus sheds its lining, and after this process is complete, the body begins to prepare for the possibility of pregnancy. The hormone levels in the body start to increase, causing the lining of the uterus to thicken in preparation for the implantation of a fertilized egg. This process occurs in the second half of the menstrual cycle, after ovulation has already taken place.

Explanation
After an egg is released from the ovary, it can survive for approximately 3 days. This is because the egg needs to be fertilized by sperm within this time frame in order for pregnancy to occur. If fertilization does not occur, the egg will disintegrate and be expelled from the body during menstruation. Therefore, the correct answer is 3 days.

Explanation
The trachea is not a name for the tube between the ovaries and the uterus. The trachea is a tube in the respiratory system that connects the larynx to the bronchi, allowing air to pass into and out of the lungs. The correct name for the tube between the ovaries and the uterus is the fallopian tube or oviduct, which is part of the female reproductive system and is responsible for transporting eggs from the ovaries to the uterus.

Explanation
The uterus is not part of the male reproductive system. It is a female reproductive organ responsible for nurturing and supporting the development of a fetus during pregnancy. In males, the penis and scrotum are part of the reproductive system. The penis is involved in sexual intercourse and the transfer of sperm, while the scrotum houses the testicles, which produce sperm and testosterone.

Explanation
Puberty refers to the period of physical and sexual maturation during which a child's body undergoes significant changes, such as the development of secondary sexual characteristics. It is not solely determined by age or specific events like starting secondary school or turning 13. The onset of puberty varies from person to person and can be influenced by factors such as genetics, nutrition, and overall health. Therefore, there is no fixed age or event that marks the beginning of puberty for everyone.

Explanation
Voice deepening is a change that only happens to boys during puberty. As they go through adolescence, their vocal cords lengthen and thicken, causing their voices to become deeper. This change is a result of increased testosterone levels and the growth of the larynx. On the other hand, underarm hair growth and increased interest in the opposite sex can occur in both boys and girls during puberty.

Explanation
The menstrual cycle starting is a biological process that only occurs in girls and women. It is a monthly cycle in which the lining of the uterus is shed, resulting in menstruation. This process prepares the body for potential pregnancy. On the other hand, the growth of a child and the increase in body odor from sweat glands can happen to both boys and girls.