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Practice each question, then open the answer or worked solution.
Paheli has a rose plant in her garden. How can she increase the number of rose plants in the garden?
Ans: The most common method of rose plant propagation is 'Stem Cutting'. So, Paheli should cut about 20-30cms long stems of a year-old plant and from its one side plant this stem into the soil. This stem cutting technique will give rise to a new rose plant.
Why do desert snakes burrow deep into the sand during the day?
Ans: Desert snakes burrow deep into the sand during the day because Deserts are too hot during the daytime. And the soil deep inside is cooler than the soil on the top. Therefore, snakes burrow deep to rest in cooler soil and escape the scorching heat of the desert.
Write the adaptation in aquatic plants due to which
(a) Submerged leaves can bend in the flowing water.
Ans: Submerged leaves can bend in the flowing water due to their special shape i.e. long narrow and ribbon-shaped. These changes in shape help to tolerate water currents without getting harmed. E.g. – tape grass.
(b) Leaves can float on the surface of the water.
Ans: Leaves that can float on the surface of the water are simple, lightweight, hollow, and long.
Mention one adaptation present in the following animals:
(a) In camels to keep their bodies away from the heat of the sand.
Ans: Camels have very long legs, so the body of the camel is far away from the surface of the sand and thus, this adaptation helps camels to keep their bodies away from the heat of the sand.
(b) In frogs to enable them to swim.
Ans: Frogs generally have webbed feet that help them to swim in the water.
(c) In dolphins and whales to breathe in the air when they swim near the surface of the water.
Ans: Dolphins and whales both have a special opening known as "Blow Holes". These specialized openings help the whales and dolphins to breathe in the air when they swim near the surface of the water.
Some desert plants have very small leaves whereas some others have only spines. How does this benefit the plants?
Ans: Deserts are well known for adverse conditions like scarcity of water. plants growing in the desert adapt themselves to such adverse conditions. So they have very small leaves and in some others, leaves are modified into spines to prevent loss of water through transpiration.
What are the specific features present in a deer that helps it to detect the presence of predators like a lion?
Ans: These are the following features that are helpful for the deer to detect the presence of predators:
(i) Deers have long and thin legs that help them to run away very fast from predators.
(ii) Deers have long and sharp ears that help them to listen to sound from the distance.
(iii) The eyes of the deer are present on the sides of its head. This enables it to keep watch in all directions.
Read the features of plants given below:
(a) Thick waxy stem
(b) Short roots
(c) Cone-shaped plants
(d) Sloping branches
(e) Small or spine-like leaves
(f) Hollow stem
Choose the type of plant for every feature given in a, b, c, d, e, and f from the list given below: Aquatic plant, Desert plant, Mountainous plant
Ans:
(a) Thick waxy stem – It is a feature of a Desert plant. It helps in the conservation of water.
(b) Short roots – It is a feature of an Aquatic plant. Water is present near the surface, so they don't need long roots.
(c) Cone-shaped plants – It is a feature of Mountainous plants. The cone shape of the plants helps the snow to slide off from the plant easily.
(d) Sloping branches- It is also a feature of Mountainous plants. The slope prevents the deposition of snow and ice on the plant.
(e) Small or spine-like leaves- it is a feature of the Desert plant. This helps in the prevention of water loss through transpiration.
(f) Hollow stem – It is a feature of an Aquatic plant. Hollow nature helps the plants to float on water easily.