c. Very short answer questions
1. Why do animals reproduce?
2. What are the male and female gametes called?
3. Give a basic difference between a zygote and a foetus.
4. Name the organs of male and female reproductive systems.
5. Why do animals undergoing external fertilisation lay large number of eggs and sperms?
Answers
Explanation:
1. Animals reproduce to give birth to babies of the same species and ensure that their species are not getting extinct from earth. This is a very important process of maintaining life and ecosystem.
2. Gametes are an organism's reproductive cells. They are also referred to as sex cells. Female gametes are called ova or egg cells, and male gametes are called sperm. Gametes are haploid cells, and each cell carries only one copy of each chromosome.
3. Zygote is a fertilized egg formed after the fusion of the sperm with the egg. It divides several times to form an embryo. On the other hand, Foetus is a stage of the embryo that shows all the main recognizable body parts of a mature organism.
5. These animals lay hundreds of eggs but all the eggs do not fertilise and develop into new individuals. The eggs get exposed to water movement, wind and rainfall. ... Thus production of large numbers of eggs ensure fertilisation of atleast few of them
Answer:
on this planet earth is from hundreds of generations ago and will continue for hundreds of generations. This continuity of generations is due to the biological process called reproduction. Reproduction is defined as the process in which an organism gives birth to its young ones. This chapter gives us complete information on how organisms reproduce and their development. The types of reproduction, sexual and asexual taking place in various organisms are explained in a precise manner.
This chapter also highlights how unicellular organisms reproduce and compare it with multicellular organisms. This chapter .