Reproduction

Correct answer: A. When fertilization does not occur and the uterine lining breaks down

Step 1: The uterine lining thickens to prepare for pregnancy. Step 2: If fertilization does not occur, this lining breaks down. Step 3: It leaves the body as blood and tissue, called menstruation.

Correct answer: A. Hormones

Step 1: Reproductive organs begin to mature during adolescence. Step 2: Hormone secretion increases at this time. Step 3: Hormones bring many physical changes in the body.

Correct answer: A. To prevent unwanted pregnancy

Step 1: Contraception is a method to prevent pregnancy. Step 2: It helps in family planning. Step 3: Some methods can also help prevent sexually transmitted diseases.

Correct answer: A. Barrier method

Step 1: A condom prevents sperm from reaching the egg. Step 2: It acts as a physical barrier. Step 3: Therefore, it is called a barrier contraceptive method.

Correct answer: A. Permanent surgical method

Step 1: In sterilization, the reproductive passage is blocked surgically. Step 2: This prevents gametes from meeting. Step 3: It is generally considered a permanent contraceptive method.

Correct answer: A. Use of condom

Step 1: Sexually transmitted diseases can spread through sexual contact. Step 2: A condom forms a barrier and reduces contact. Step 3: Therefore, it can help in protection.

Correct answer: A. By fusion of sperm and egg

Step 1: Sperm is the male gamete. Step 2: Egg is the female gamete. Step 3: Their fusion forms a zygote.

Correct answer: A. Zygote

Step 1: Fertilization forms a zygote. Step 2: The zygote divides repeatedly. Step 3: These divisions begin the development of an embryo.

Correct answer: A. In testes

Step 1: Testes produce sperms. Step 2: Testes also produce the male hormone testosterone. Step 3: It is linked with many male changes during puberty.

Correct answer: A. To produce eggs

Step 1: Ovaries are part of the female reproductive system. Step 2: They produce eggs. Step 3: They also help produce female hormones.

Correct answer: A. To carry sperms forward

Step 1: Sperms are formed in testes. Step 2: They need to reach the passage for release. Step 3: The vas deferens helps transport sperms.

Correct answer: A. To carry egg from ovary toward uterus

Step 1: An egg is released from the ovary. Step 2: The fallopian tube carries it toward the uterus. Step 3: Fertilization usually occurs in this tube.

Correct answer: A. To the stigma of the same flower or same plant

Step 1: In self-pollination, pollen remains within the same plant. Step 2: It may reach the stigma of the same flower or another flower of the same plant. Step 3: This is one type of pollination.

Correct answer: A. To a flower of another plant of the same species

Step 1: In cross-pollination, pollen goes from one plant to another plant. Step 2: The other flower belongs to the same species. Step 3: This can increase variation in offspring.

Correct answer: A. Wind, water, and insects

Step 1: Pollen grains must move from anther to stigma. Step 2: Wind, water, and insects can help carry them. Step 3: Therefore, they are considered agents of pollination.

Correct answer: A. Sexual reproduction

Step 1: In sexual reproduction, gametes from two parents fuse. Step 2: This forms a new combination of genetic material. Step 3: Therefore, offspring may show more variation.

Correct answer: A. Because genetic material comes from only one parent

Step 1: Asexual reproduction involves only one parent. Step 2: The offspring receives genetic material from that parent. Step 3: So the offspring is very similar to the parent.

Correct answer: A. To receive pollen grains

Step 1: Stigma is the upper part of the pistil. Step 2: Pollen grains reach it during pollination. Step 3: Therefore, its main function is to receive pollen grains.

Correct answer: A. To connect stigma and ovary

Step 1: The pistil has stigma, style, and ovary. Step 2: The style connects the stigma to the ovary. Step 3: The pollen tube can grow downward through this path.

Correct answer: A. To carry male gamete to the egg

Step 1: A pollen grain can germinate on the stigma. Step 2: This forms a pollen tube. Step 3: The pollen tube carries the male gamete to the egg.

Correct answer: A. Fertilization and implantation of embryo in uterus

Step 1: Fertilization forms a zygote. Step 2: The zygote divides to form an embryo. Step 3: Pregnancy progresses when the embryo implants in the uterine wall.

Correct answer: A. Release of egg from ovary

Step 1: Eggs are produced in ovaries. Step 2: A mature egg may be released from the ovary. Step 3: This event is called ovulation.

Correct answer: A. Movement by tail

Step 1: Sperm is the male gamete. Step 2: Its tail helps it move. Step 3: This movement helps it reach the egg.

Correct answer: A. Healthy and safe functioning of the reproductive system

Step 1: Reproductive health is not only about producing children. Step 2: It also includes hygiene, safety, and correct knowledge. Step 3: A healthy reproductive system is important for both person and society.

Correct answer: A. Fruit

Step 1: The ovary is present in the pistil of a flower. Step 2: After fertilization, the ovary grows and becomes a fruit. Step 3: Remember that the ovule becomes a seed and the ovary becomes a fruit.