Time to answer
Write true or false.
1. Mammals do not give birth to young ones directly. (F)
2.Mammals are warm blooded. (T)
3.mammals have hair or fur on their body. (T)
4. Mammals look after their young ones for a very short period of time. (F)
Fill in the blanks.
1. Albumen is the white part of the egg.
2.frogs lay their eggs in large clusters known as spawns.
3. The larva of housefly is called maggot.
4. The process by which insecta shed their skin is called moulting.
5. In eggs, the yolk provides nutrition to the developing embryo.
1. Multiple choice questions (MCQs)
a . Which of the following is the proo by which a young one comes out of an egg?
Ans. 2. Laying
b. What are the animals who change their body temperature according to the temperature of their surrounding known as?
Ans. 2. Cold blooded
C. Which of the following is not a mamals?
Ans. Crocodile
2. Give one word answer for the following.
a. The yellow part inside an egg
Ans. Yolk
b. Animals producing young ones of their own kind
Ans. Viviparous
C. Young one of an insect that looks similar to the adult
Ans. Nymph
d. Young on. e of an insect that looks different from the adult.
Ans. Larva
Q. 3.Read the following two statements and choose the correct option.
Statement1- mammals have hair on their body.
Statement2.-All mammals live on land.
Ans. Statement 1 is correct but 2 is incorrect.
a. What are the two ways by which animals reproduce?
Ans. Animals reproduce by laying eggs and by giving birth to the young ones directly.
b. What is spawn.
Ans. Spawn is a large clusters of eggs of amphibians.
c. Write two features of mammals?
Ans. 1.mammals give birth to their young one.
2. Their body is covered with fur and hair.
3. They are warm blooded
4. They are terrestrial and have lungs to breathe.
d. Why does a mother bird sir on her eggs?
Ans. The mother bird sits on the egg to keep them warm and incubale property.
5. Long answer type question
a. Discuss the reproduction in amphibians.
Ans. Amphibians require both land and water to complete life cycle. For example- frog by hundred of egg once in a safe place in lake or pond. These large clusters of egg are called spawns. The egg hatch into tiny tadpoles. They resemble fish and swim in water. After a few weeks a tadpole begins to develop legs. Tadpoles tails get shorter and shorter until they disappear entirely and tadpoles grow into adult frogs.
b. Describe the structure of an egg with all its functions.
Ans. Usually eggs are oval or round in shape. They are of various size most of the eggs have a hard outer shell which protects the growing embryo inside it. With in the ahell there is white thick liquid which has a yellow part in the center. The white part is albumen and the yellow part is called the yolk which provides nutrition to the developing embryo.
c. Why are most of the reptile eggs eaten by other animals?
Ans. Most of the reptile do not care for their eggs and leave them to hatch and care for themselves. Hence most of the eggs are eaten by other animals.
Ans. Insecta like butterfly pass through four stage in their life cycle. Here the young one which hatch out of the eggs looks quite different from the adult insecta. It is called a larva. The larva of butterfly is called caterpillar. The larva feeds and cover it self in a cocoon. This stage is called a pupa finally the pupa burst out of its cocoon and the adult insect comes out.
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