Grade-3 Science Chapter- 3 Common Insects - Insects in Our Surroundings


Chapter 3
Topic: Common Insects - Insects in Our Surroundings
Section A

Identify the following insects and name them.
Label the parts of the insect shown in the picture given below.
 Ans-


Give one word answers.
(a) Insect that collects honey.                  Honey Bee
(b) An insect that causes malaria.           Mosquito
(c) An insect that damages crops.           Grasshopper / Locust
(d) An insect that help in pollination.        Butterfly / Bee

 Section B

 People have always loved the beauty of butterflies!

 Look at the pictures of these butterflies and then fill in the observation sheet.

 Observation Sheet
(a)  How many butterflies to you observe in the picture? __4____
(b)  Do you see a pattern in the wings of the butterflies? _Yes__
(c)  Are the patterns observed similar in all butterflies?  _No__
(d)  Write any four features that are common in these butterflies?
Ans- Four features common in these butterflies-
1-   Butterflies have four wings.
2-   They have a pair of antennae.
3-   Their body is divided into head, thorax and abdomen.
4-   They have six legs.

 Fill in the table to check whether the following are insects:

Name
Does its body have a hard covering?
How many legs does it have?
Does it have feelers/ antennae?
Is it an insect?
 Honey Bee
Yes
6
Yes
Yes
 horse
No
4
No
No
 mosquito
Yes
6
Yes
Yes
 ant
Yes
6
Yes
Yes
 snake
Yes (Scales)
No
Yes
No
 grasshopper
Yes
6
Yes
Yes
 baby
No
2
No
No

 Identify the different stages in the life cycle of butterfly using the given clue cards.

 I am round in shape and lay on the leaves of plants.
  Egg
 I am in my chrysalis stage.
  Pupa
 At this stage, I eat and eat to grow quickly.
  Larva

Q. Why are some insects called pests?
Ans- Some insects harm people, their livestock or crops. Therefore they are called as pests.

Section C

 Walking Through the forest…..
 Imagine if you could go on a forest trail, which insects would you most likely  observe?  List them in the space provided below.  Choose the one you like the best and the reason for your choice.

 I saw…..

Butterflies
Bees
Ants
Beetles
Wasps

The insect of my choice- Butterfly_

The reason for my choice-

I like butterflies as they are beautifully coloured. Butterflies also help in pollination.

Section D

 Name three useful insects.
1-   Honeybee
2-   Silkworm
3-   Butterfly
 Name three harmful insects.
1-   Mosquito
2-   Housefly
3-   Cloth moth

 Name the four stages in the life cycle of a butterfly.

Egg

Pupa

Larva

Butterfly

Section- E
(Revision Exercise)

Q. Name the three important body parts of an insect.
Ans- The three important body parts of an insect are:
1-   Head
2-   Thorax
3-   Abdomen

Q. How many legs do insects have?
Ans- Insects have six legs.

Q. What is the function of feelers found in insects?
Ans- Feelers found in insects are used to smell, feel and taste things.

Q. Where would you find the eggs of a butterfly?
Ans- Eggs of a butterfly can be found on leaves of plants.

Q. Give two examples of social insects.
Ans- Two examples of social insects are:
1-   Ants
2-   Bees
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