Solved Exercises

1. Tick (√) the correct answer.
   i. Which characteristic is common among butterfly, bird and bat?
   (a) teeth (b) hair (c) bones.

ii. Many plants produce fruits:
(a) to protect seeds. (b) to produce food for the seeds. (c) to store water for the seed germination. (d) to stop seeds from dispersal.

iii. Which one of the following is an example of invertebrate?
(a) cat (b) butterfly (c) lizard (d) frog

iv. Which part of a plant is absent in non-flowering plants?
(a) root (b) seed (c) fruit (d) leaf

v. Which one of the following is a non-flowering plant?
(a) apple (b) rose (c) mango (d) pine

vi. Which statement is correct for all the vertebrates?

(a) Have fur (b) Have more than four legs (c) Have backbone (d) Can fly in air

2. Write short answers.

i. Write any four characteristics of living things?

i. Living things use food to remain alive. They breathe, Reproduce offsprings of their own kinds. Grow, and have the ability to sense.

ii. Write any three differences between plants and animals?

ans. Plants are usually green, prepare their own food, and cannot move, while animals are of various colors, depend
on plants or other animals for their food, and can move from one place to another.

iii. Differentiate between vertebrates and invertebrates?

ans. Vertebrates are the animals having backbone while invertebrates are the animals having no backbone.

iv. Write names of different types of teeth and their functions.

i. Incisors – Biting and cutting food
ii. Canines – Piercing and tearing food
iii. Premolars – Chewing and grinding food
iv. Molars – Chewing and grinding food

v. What functions do bones and muscles perform together?
i. Bones provide support to the body, and muscles help you to move by working with the bones and joints.

vi. Describe the functions of lungs and heart?

ans. Lungs are responsible for the exchange of oxygen between blood and air, and the heart pumps blood
throughout the body through blood vessels.

3. Constructed Response Questions:

The diagrams show a tiger skull and a rat skull.

(a) What does a tiger do with its canines?
ans. A tiger uses its canines for piercing the prey.

(b) What does a rat do with its incisors?
ans. A rat uses its incisors for biting food or killing prey.

Investigate:

i. How are the invertebrates useful for humans?
ii. ii. What is the importance of biodiversity?
i. The existence of many living things is important for the survival of life on Earth.
iii. What is the importance of a flower?
i. The function of flowers is to produce seeds and the function of seeds is to produce new plants.