Assignment
Lesson :The Living Organisms and their Surroundings
Why is reproduction important for organisms?
Fill in the blanks:
(a) Saline water, hot air and sand are ................ components of a habitat.
(b) The habitat of plants and animals that live in ................ is called the aquatic habitat.
(c) ................ enable a plant or an animal to live in its surroundings.
(d) Plants and animals that live on land are said to live in ................ habitats
Paheli has a rose plant in her garden. How can she increase the number of rose plants in the garden?
Why do desert snakes burrow deep into the sand during the day?
Write the adaptation in aquatic plants due to which
(a) submerged leaves can bend in the flowing water.
(b) leaves can float on the surface of water. .
Mention one adaptation present in the following animals:
(a) In camels to keep their bodies away from the heat of sand.
(b) In frogs to enable them to swim.
(c) In dolphins and whales to breathe in air when they swim near the surface of water.
Some desert plants have very small leaves whereas some others have only spines. How does this benefit the plants?
What are the specific features present in a deer that helps it to detect the presence of predators like lion?
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
What are the adaptive features of a lion that helps it in hunting?
Answers
1.Reproduction is very important for living organisms as it helps them to produce young ones of their own kind and maintains the continuity of life.
2.(a) abiotic ( non-living)
(b) water
(c) Adaptations
(d) terrestrial
3.Paheli can increase the number of rose plants in the garden by planting stem cuttings of rose plant. It is a common method of plant propagation in which 20-30 cm long pieces of one year old stems are cut and their lower ends are planted in the soil.
4. As the deeper layers of sand are cooler, so desert snakes burrow deep into the sand to stay away from heat of the desert during day time.
5.(a) Submerged leaves are long narrow and ribbon – like which can easily bend in flowing water and withstand water currents without getting damaged, e.g., tape grass.
(b) Stems/stalks of floating leaves are long, hollow and light which help the leaves to float over water surface.
6.(a) Long legs of camel help to keep the upper part of the body away from the heat of the sand on the ground.
(b) Webbed feet enable frog to swim in water.
(c) Blow holes present in dolphins and whales help them to breathe in air when they swim near the surface of water
7.Small leaves and spines are modifications of leaves, which are adaptations of plants to live in desert habitat. In these modifications the surface of leaf lamina is reduced thereby reducing water loss by transpiration.
8.Specific features present in deer that help them to detect the presence of predators like lion are:
(i) Long ears to hear and recognise movement of predators.
(ii) Eyes on the sides of its head which allow it to look in all directions.
9.(a) Desert plant
(b) Aquatic plant
(c) Mountainous plant
(d) Mountainous plant
(e) Desert plant
(f) Aquatic plant
10. Adaptive features of a lion that help it in hunting are as follows :
Brown body colour helps it to hide in dry grassland for avoiding detection by its prey.
Eyes placed in front allow it to know the exact location and movements of its prey.
Strong paws, sharp teeth and long claws help it to catch and kill the prey.
No comments:
Post a Comment