SCIENCE
ANIMAL ADAPTATION
STD:7
YEAR: 2013-14
Answer the following questions:
Q1) Why are Siberian cranes called migratory birds?
Ans) Because during winter months they migrate from a colder place to a warmer place to
cope up with the cold climate and shortage of food.
Q2) Why does the Polar bear have a round, bulky body?
Ans) Because they have thick layer of fat and fur which help to keep it well insulated during
extreme winters.
Q3) Who incubates the eggs of Penguins?
Ans) Males incubates the eggs of Penguins
Q4) What are the adaptive features of the red-eyed tree frog?
Ans) – It has a bright green body with blue sides and pale yellow stripes, which helps in
camouflaging.
- Its feet have suction cups on the toes to stick to the trees. It also has powerful legs.
- Its eyes are red and bulging. This scares away potential predators.
- It is a nocturnal animal and sleeps during the day and underside large tree leaves.
Q5) How can the Toucan feed on nuts that have hard shells?
Ans) Toucan has developed a big, strong and sharp beak to squash many kinds of nuts and
berries found on trees.
Q6)Write four functions of the trunk of an elephant.
Ans) It is used for breathing, feeding, smelling, drinking, lifting load, grasping and for
defense.
Q7) Give reasons for the following:
i) The Polar bear has white fur.
Ans) To keep itself warm and also to camouflage with the snow.
ii) Penguin rests its egg on its foot.
Ans) Because over there it is cushioned and protected by males “brood patch”, a warm fold
of feathers and fat that rests atop the feet.
iii) Siberian crane visits Asian countries during extreme winter season.
Ans) To cope with the cold climate and shortage of food supply during winter months.
iv) Toucan can crack the hard shell of nuts.
Ans) Because it has developed a big, strong and sharp beak to squash the nuts.
Q8) Discuss the adaptive features of the Polar bear.
Ans) – It is a warm-blooded animal.
- It can maintain its body temperature even in severe cold climatic conditions due to thick
layer of fat called blubber.
- Its thick white fur also helps to keep it warm and helps in camouflaging with snow.
- It is a strong swimmer. It has wide and large paws that help in swimming and walking on
snow.
- It can keep its nostrils closed for a very long time while swimming under water.
It has a strong sense of smell and can catch its preys smell from far as one kilometre.
Q9) Why do animals in the tropical rainforests live on different layers of the forest?
Ans) The tropical region is located near the equator and has hot and wet climate.
- The summer temperature can be as high as 50°C. In winters, the minimum temperature
seldom goes to below 15°C to 20°C.
- The days and night are almost equal in length throughout the year.
- The tropical rainforests in this region are dense, warm and wet. Hence, there is plenty of
vegetation and various types of animals found here.
-And therefore, to avoid competition for food, the animals confine themselves to different
layers of the forest.
Q10) How are elephants adapted to live on the forest floor of the rainforest?
Ans) – They have large ears with a keen sense of hearing. The large ears also help them to
lose heat from the body to keep themselves cool.
- The upper lip is fused with the nose. The nose is modified in the form of a long trunk, which
is used for breathing, feeding, smelling, drinking, lifting load, grasping and for defence.
- They have a unique foot structure which helps them to walk over uneven surfaces and
swampy ground.
- Adults develop modified teeth called tusks. They use them to tear the bark of trees, which is
their favourite food.
NOTE: KINDLY READ THE TEXTBOOK ALONG WITH THE NOTES