3rd Class Science Living and Non-living Things Reproduction

    Reproduction

All living things have the potential to produce offspring of its own kind. By reproduction process, organisms maintain their balance in the nature. Different animals reproduce in different ways. Hence, the reproduction is one of the most important characteristic features of living things.

Look at the following ways of reproduction in animals:

Insects lay eggs which pass through different stages in their life cycle. Grasshopper and cockroach have three stages in their life cycle.

Egg ----> Nymph ----> Adult

Housefly and butterfly pass through four stages.

 Egg ---->  Caterpillar ----> Pupa ----> Adult

Look at the following table of Animals and its young ones:

Plants reproduce with the help of seeds. Seeds grow into new plant on getting proper condition of light, water, warmth and air. Few plants like potato, sugar cane, rose, money plants, and bryophyllum grow into a new plants with the help of stem, roots or leaves. Non living things do not reproduce.      

     If dog reproduces puppy then lion reproduces which one of the following?

(a) Kitten

(b) Chick

(c) Calf

(d) Cub

(e) Baby

Answer: (d)

Explanation

Cub is the young one of lion, kitten is the young one of cat, chick is the young one of hen, and calf is the young one of cow. Therefore, option (d) is correct and rest of the options is incorrect.

    Which one of the following is wrongly placed in the following table?  

(a) Birds

(b) Insects

(c) Whales

(d) Elephant

(e) Human beings

Answer: (c)

Explanation

Whale is a mammal not fish and it gives birth to young ones. Therefore, option (c) is correct and rest of the options is incorrect.

The two sharp front teeth which rodents use for gnawing are incisors.

The elephant smells with its trunk.

Spider is not an insect and it has 8 legs.

Spiny anteater is a mammal that lays eggs.

The most useful moth is the silk moth. Its caterpillars are called silk worm.

The baby of a young elephant is longer than almost any other animal.

A human baby spends about nine months inside its mother's belly before being born.

Snakes are hunters because they have long teeth for grabbing prey.

There are two types of things on the earth, living and non-living.

Living things are further divided into two groups, plants and animals.

Growth is one of the most important characteristic feature of a living thing.

Every living organism require food and air to survive.

Plants take in oxygen all the time.