Chapter 38, Problem 1SA

Summary Introduction

Introduction:

There are a number of animals present in the environment. Animals can live in a variety of habitats. The animals that are found on the land are called as land animals. However, the organisms that live in water bodies are called aquatic animals. All the animals have the capability to produce their offsprings by the process of reproduction.

Answer to Problem 1SA

Correct answer:

The land animals contain an internal fertilization system. Hence, the correct answer is option a.

Explanation of Solution

Reason for correct answer:

Option a. is given as “internal”.

The type of fertilization system in which the male and female gametes fertilize inside the animal’s body is termed as internal fertilization. The male gamete is released in the body of the female partner. After this, the male gamete fuses with the female gamete inside the body of the female partner. Most of the land animals show this type of fertilization system. They need internal body conditions for the fusion of both the gametes.

Reason for incorrect answer:

Option b. is given as, “external”.

The fertilization system in which the male and female gametes fuse with each in the external environment is called external fertilization. This type of fertilization does not occur inside the body organisms. However, land animals do not have this type of fertilization system. In land animals, the fusion of both male gamete and female gametes takes place inside the body of the female partner. This indicates that land animals do not have an external fertilization system. Hence, option b. is incorrect.

Conclusion

Internal fertilization system is observed in the animals that live on land. Thus, the correct option is a.