Reproduction

Step 1: Some contraceptive pills are hormone-based. Step 2: They can prevent or alter ovulation. Step 3: If no egg is released, the chance of fertilization decreases.

Step 1: A condom prevents sperms from reaching the egg. Step 2: It also reduces direct contact of body fluids. Step 3: Therefore it can help in both contraception and disease prevention.

Step 1: An intrauterine device is placed in the uterus. Step 2: A copper device negatively affects sperms. Step 3: This lowers the chance of fertilization.

Step 1: Sperms are produced in testes. Step 2: The vas deferens carries them forward. Step 3: Blocking this tube prevents sperms from reaching the released fluid.

Step 1: Egg enters the fallopian tube from ovary. Step 2: Fertilization usually happens in the fallopian tube. Step 3: Blocking this tube prevents sperm and egg from meeting.

Step 1: Sexually transmitted diseases can spread through body fluids or contact. Step 2: Unsafe behavior increases infection risk. Step 3: Safe behavior and correct knowledge help in prevention.

Step 1: Reproductive health is linked with body and safety. Step 2: Wrong information can increase health risks. Step 3: Correct information helps in family planning and disease prevention.

Step 1: Vegetative propagation is a method of asexual reproduction. Step 2: A new plant develops from a part of one parent. Step 3: So genetic mixing is low and variation remains less.

Step 1: Spores can often survive unfavorable conditions. Step 2: Thick walls protect them from drying and damage. Step 3: Under suitable conditions they can germinate and form a new organism.

Step 1: Asexual reproduction can produce offspring quickly. Step 2: But offspring are similar to the parent and variation is low. Step 3: In a changing environment, low variation can be disadvantageous.

Step 1: In sexual reproduction two gametes fuse. Step 2: If both have half the number, the normal number is restored after fusion. Step 3: This keeps chromosome number stable in a species.

Step 1: Fertilization forms a zygote. Step 2: The zygote undergoes cell division. Step 3: Repeated division and development form an embryo.

Step 1: Ovulation releases an egg from the ovary. Step 2: If the egg is not fertilized, the prepared uterine lining is not used. Step 3: Then the lining can break down as menstruation.

Step 1: Egg moves through the fallopian tube. Step 2: Sperm can reach this place for fertilization. Step 3: If the tube is blocked, gamete fusion becomes difficult.

Step 1: Testes produce sperms. Step 2: Sperm is the male gamete that fuses with the egg. Step 3: If sperms are not formed, the chance of fertilization decreases greatly.

Step 1: Ovules are found inside the ovary of a flower. Step 2: They contain the structure linked with the female gamete. Step 3: After fertilization, the ovule develops into a seed.

Step 1: After fertilization, the ovary becomes a fruit. Step 2: Fruit can cover and protect seeds. Step 3: Many fruits also help in seed dispersal.

Step 1: Water activates the seed. Step 2: Air is needed for respiration and suitable temperature for growth. Step 3: These conditions help the embryo germinate.

Step 1: No organism lives forever. Step 2: Reproduction forms new organisms. Step 3: Formation of new generations keeps the species continuing over time.

Step 1: Male and female gametes are separate cells. Step 2: During fertilization they fuse. Step 3: Their fusion forms the zygote.