7th Std Science 1 The Living World : Adaptations and Classification l Question and Answer

YADNYA e-Learning

Science Studies -  7th Standard

1. The Living World : Adaptations

and Classification

Question And Answer

1. Find my match !

2. Read the paragraph and answer the following questions.

I am a penguin. I live in polar region covered by snow. My abdomen is white. My skin is thick with a layer of fat underneath. My body is spindleshaped. My wings are small. My toes are webbed. We live in flocks.

(a) Why is my skin white and thick and why is there a thick

layer of fat underneath ?

Ans: Penguin skin is white and thick and there is a thick layer of fat underneath because it keep them warm under such extreme cold conditions.

(b) Why do we live in flocks sticking close to each other ?

Ans: In order to escape the extreme cold conditions, they nestle together to keep each other warm hence they live in flocks sticking close to each other.

(c) Which geographical region do I inhabit? Why?

Ans: Penguin inhabit in polar region, because we are aquatic flightless bird.

(d) Which adaptations should you have to enable you to live

permanently in the polar region ? Why ?

Ans: Black and white skin with thick layer of fat beneath it and presence of strong muscles in chest are characteristics that help penguin to live permanently in polar region.

3. Who is lying ?

(a) Cockroach – I have five legs.- Lying

(b) Hen – My toes are webbed.- Lying

(c) Cactus – My fleshy, green part is a leaf.- True

4. Read each of the following statements.Write a paragraph about adaptation with reference to each statement.

(a) There is extreme heat in deserts.

Ans: Deserts are characterized by severe scarcity of water. Hence, desert animals have a thick skin to prevent loss of water from the body. Their legs are long with flat and cushioned soles. The nostrils are protected by folds of skin. The eyelashes are long and thick. Rats, snakes, spiders, lizards in deserts live in deep burrows during daytime and are active at night.

(b) Grasslands are lush green.

Ans: Diverse types of bushes and grasses are found in the grasslands. Fibrous roots of grasses prevent soil erosion. Forests in the equatorial region are dense. Animals like tiger, elephants and deer can remain hidden in these grasses. However, grasses in cold regions are very short. Animals like the rabbit are found in such grasses. Vast meadows are found in hilly areas as well as plains.

(c) Insects are found in large numbers.

Ans: Insects are found in large numbers because they have developed mechanism which help them to survive even in harshest of environment.

(d) We hide.

Ans: There are certain species which are able to hide themselves by bending their colour with that of surrounding. Like lizards, butterfly, frog etc.

(e) We have long ears.

Ans: Animals with long ears are found in grassland, It is an adaptive mechanism which enables them to receive sound from long distance.

5. Answer the following.

(a) Why is the camel called the ‘Ship of the desert’ ?

Ans: Camel called the ship of desert because it is only the means of transport found in desert. The body of camel has undergone various modifications that help to survive in hot and dry conditions of desert.

(b) How can the plants like cactus and acacia live in deserts

with scarce water ?

Ans: Desert plants are either leafless or their leaves are like small needles or have been modified into thorns. As a result, they lose very little water by evaporation. The stem stores water and food and is therefore fleshy. The stems are green as they perform photosynthesis in the absence of leaves. Their roots penetrate deep into the soil and some roots spread away into the soil in search of water. There is a thick layer of a waxy Cactus substance on the stems of these plants, too.

(c) What is the inter-relationship between adaptations of organisms and their surroundings ?

Ans: Adaption is defined as the modification or change in the organism body or behaviour that help to survive in a particular environment. The environment in which an animal survives consist of many different things. These factors can be in form of climate the kinds of food plant that grow in it.

(d) How are organisms classified ?

Ans: The hierarchy of classification was developed by Carolyn Linnaeus. It refer to the organisation or classification of organisms in order to rank the importance. Include order, family, genus, and species in that order thus species is the basic unit of classification.