GSEB Solutions for Class 8 Science and Technology – Adaptation

GSEB Solutions for Class 8 Science and Technology – Adaptation (English Medium)

GSEB SolutionsMathsScience
Exercise 71:

Solution 1(a):

Boat and fish structures are narrow at its anterior and posterior ends and swollen in the middle region.

Exercise 72:

Solution 1(a):

Fish possess nostrils in place of nose.

Solution 1(b):

1. Fish have gills for respiration and tail to change its direction.
2. Sea turtles possess forelimbs that are modified into long flippers for swimming.

Solution 1(c):

	Human	Bird
Size of the body	Modified forms of hand, legs, waist, feet	Hands modified into wings
Shape of the body	Differ in shape	Definite shape
Weight of the body	Variable weight	Light weight
Comparison between their hands, legs, nose, eyes, etc	Various functions are performed by hands, legs, nose and eyes	Birds possess wings, beak and webbed feet.

Exercise 74:

Solution 1(a):

The food habits of dove and eagle vary depending on their adaptation to the environment. The dove feeds on dead animals and small insects whereas the vultures feed on some reptiles.

Exercise 74:

Solution 1(a):

he similarities of the above burrowing animals are-

1. Presence of teeth
2. Feed on animals
3. Live in burrows
4. Eyes located on the sides of the head
5. All are vertebrates

Exercise 76:

Solution 1(a):

1. Pigeon (Due to the nature of feed, the beaks are small and pointed. They feed on insects; so, it is easy for them to pick insects)
2. Eagle (The eagles also need to feed on the dead animals as they tear off their skin)
3. Crow/Birds (The birds fly and rest at a particular place; they put pressure on that particular place with the help of their feet to fly again)
4. Duck (They swim on water; so, they need webbed feet)

Exercise 78:

Solution 1(a):

Observed organ	A plant of Zizypus/ Acacia/ Date palm	A plant of money plant/ Water chest nut (Trapa)/ Lotus
Root system	Fibrous root	Taproot
Stem	Tough and fibrous vascular bundle	Weak stem
Leaf	Long leaves	Heart shaped with yellow spots
Other	Requires high temperature for growth	Needs room temperature to grow

Exercise 79:

Solution 1:

The upper surface of the leaves is deep green due to the presence of chlorophyll but the lower surface is rough due to projections from the veins.

Solution 2:

Due to variation of food habits like nuts, fruits, nectar and animal feeds, the beaks of the birds differ. For example, the beak of crows and vultures are sharp and pointed so they can tear off the dead animal’s body and the doves, sparrows feed on insects from the ground due to which they have small and pointed beaks.

Solution 3:

The hairs help polar animals like polar bears stay warm by trapping the heat close to the skin. So, the polar animals are said to be warm blooded animals.