Reproduction in Animals

Extra Questions

Very Short Answer Type

Question 1: What is reproduction?

Answer: The process by which an organism produces its offspring is called reproduction.

Question 2: What is sexual reproduction?

Answer: When two parents are involved in reproduction and gamete formation takes place, it is called sexual reproduction.

Question 3: What is asexual reproduction?

Answer: When a single parent is involved in reproduction and gamete formation does not happen, it is called asexual reproduction.

Question 4: What is fertilization?

Answer: Fusion of male and female gametes is called fertilization.

Question 5: What is conception?

Answer: Implantation of embryo in uterus is called conception.

Question 6: What is external fertilization?

Answer: When fertilization takes place outside the animal’s body, it is called external fertilization.

Question 7: What is internal fertilization?

Answer: When fertilization takes place inside the animal’s body, it is called internal fertilization.

Question 8: What is in-vitro fertilization?

Answer: When fertilization is carried out in laboratory, it is called in-vitro fertilization.

Question 9: What are oviparous animals?

Answer: Animals which lay eggs are called oviparous animals.

Question 10: What are viviparous animals?

Answer: Animals which give birth to young ones are called viviparous animals.

Short Answer Type

Question 1: What is the difference between sexual and asexual reproduction?


Sexual ReproductionAsexual Reproduction
Two parents are involved.A single parent is involved.
Gametes are formed.Gametes are not formed.
Fertilization takes place.Fertilization does not take place.
Examples: humans, frog, bird, etc.Examples: amoeba, hydra, sponge, etc.

Question 2: Briefly explain the structure of sperm.

Answer: A sperm is very small in size, and is unicellular. It is composed of a head, middle piece and a tail.

Question 3: What is an embryo?

Answer: When the zygote develops to a stage that differentiation into tissues is accomplished, this stage is called embryo.

Question 4: What is foetus?

Answer: When embryo starts resembling a human being, it is called foetus.

Question 5: Briefly explain in-vitro fertilization.

Answer: Any biological process carried out in laboratory is called in-vitro. Thus, fertilization carried out in laboratory is called in-vitro fertilization. After in-vitro fertilization, zygote is allowed to develop into a mass of cells and is then transferred into the uterus for subsequent development. Many women may fail to conceive due to certain problems. In-vitro fertilization helps such women to bear a child.

Question 6: Explain budding with the help of suitable example.

Answer: This method is seen in multicellular animals which are highly simple in structure. A small bud develops on the body. The bud develops and starts resembling its mother. After that, the bud gets detached from the mother’s body to begin life as a new individual. Examples: Hydra and sponges.

Question 7: Explain binary fission with the help of suitable example.

Answer: This method is seen in unicellular animals, e.g. amoeba. The cell of amoeba divided into two daughter cells. Each daughter cell becomes a new individual.

Question 8: Explain the steps from fertilization to child birth.

Answer: Conception and Child Birth: It takes place in the female reproductive system through following steps:

  • A single egg comes out of the ovary every month, and reaches the fallopian tube.
  • Sperms reach the fallopian tube where a sperm fertilizes the egg. This results in formation of zygote.
  • Zygote undergoes several rounds of cell division to become a ball of cells.
  • This ball of cells moves to the uterus and gets implanted in the wall of the uterus. This process is called conception. Conception marks the beginning of pregnancy.
  • Embryo develops inside the uterus to become a baby.

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