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Something to Know
A. Fill in the blanks.
1. Butterflies are attracted to fresh flowers.
2. Honeybees suck nectar from flowers.
3. The six-sided chambers of beehives are called combs.
4. Malaria is spread by the bite of female Anopheles mosquito.
5. The cover, weaved by a silk moth, around itself is called a cocoon.
6. Bees and wasp are stinging insects.
B. Write True or False for the following statements.
1. Insects help in pollination. True
2. Lac insects grow on banyan trees. True
3. Houseflies spread malaria. False
4. Aedes mosquito spreads dengue. True
5. Bubonic plague is caused by a mosquito. False
C. Tick (✔) the correct option.
1. The insect, that usually spreads jaundice, is the-
(a) mosquito
(b) wasp
(c) housefly (✔)
(d) butterfly
Answer – (c) housefly (✔)
2. Honeybees make honey from-
(a) lac
(b) nectar (✔)
(c) milk
(d) sugar
Answer – (b) nectar (✔)
3. The sting of insects, like the bees and wasps, is located on their-
(a) wing
(b) back (✔)
(c) mouth
(d) leg
Answer – (b) back (✔)
4. An insect, that helps to save our crops from pests, is the-
(a) wasp
(c) bee
(b) lady bird beetle (✔)
(d) butterfly
Answer – (b) lady bird beetle (✔)
D. Answer the following questions in brief.
1. What is pollination?
Answer – The process of shifting of pollen grains from one place to another is called pollination.
2. Where do bees store the nectar?
Answer – Honeybees store the nectar in the six sided chambers called combs.
3. Name the insect that gives us silk. What does it feed on?
Answer – We get silk from silk worm. It feeds on mulberry leaves.
4. Name the diseases that get spread by houseflies.
Answer – Diseases like diarrhea, cholera and jaundice are spread by houseflies.
E. Answer the following questions.
1. How does a silk moth weave a cocoon?
Answer – The silk moth secretes a liquid which changes into a fine thread. Hence, the silk moth weaves cocoon from this thread.
2. How is honey collected from a beehive?
Answer – Honey is collected from a beehive by following ways.
Lightning fire under it the hive.
The heat and smoke from fire drives bee out of hive.
The honey collectors remove hive and collect honey.
3. What is lac? State its four uses.
Answer – The semi-solid substance secrete by lac insects is called lac.
Four uses of lac are as follows-
It is used for making paints.
It is used for making printing ink.
It is used for making bangles.
It is used for making varnishes.
4. How do houseflies spread diseases?
Answer – Houseflies spread diseases in following ways –
They gather germs by sitting on garbage or animals’ excreta.
Carrying germs on their feet and body they sit on any food items and pass the germs on the food.
Consuming the uncovered and infected food or water cause diseases like diarrhea, cholera and jaundice.
5. How can we save ourselves from harmful insects?
Answer – We can save ourselves from harmful insects by –
Maintaining cleanliness and hygiene.
We can get rid of insects by using insecticides or pesticides.
Applying neem or kerosene oil on wooden furniture.
We can keep dried neem leaves in clothes.
Value Based Question
Mohit studies in Class-IV. He likes street food very much. His mother always warns him not to eat unhealthy and uncovered food. One day Mohit ate some uncovered street food while coming back to his home from school. In the evening he complained about stomach cramps and vomiting. His mother immediately took him to a doctor for treatment. The doctor diagnosed that Mohit was suffering from diarrhea. Mohit told the truth to his mother and felt sorry for not listening to her advice. He also promised not to eat uncovered street food in future.
1. Name the insect which spreads diarrhea.
Answer – Housefly is the insect that spreads diarrhea
2. State the common symptoms of diarrhea.
Answer – The common symptoms of diarrhea are:
Vomiting
Dysentery
Stomach ache
3. Your younger brother/sister likes to eat ‘junk’ and street food. How can you help him/her to develop healthy eating habits?
Answer – I can help him/her to develop healthy eating habits by-
By teaching him/her the benefits of eating healthy food.
By not letting him/her I her eat junk food.
By accompanying him/ her in eating fruits & vegetable
4. Mention any two values shown by Mohit.
Answer – The values shown by Mohit are-
Honesty
Self-realisation.
Something to Do
1. Collect the pictures of different insects. Paste them in a scrapbook and write their names also.
Answer –
2. Find out the details about the life cycle of silk moth and draw it in your notebook.
Answer – The life cycle of mulberry silkworm completes in 45-55 days, consists of stages egg, larva, pupa and moth.
3. Collect information about the different types of natural methods, used in households, to keep away harmful insects.
Answer – 1. Install mosquito nets and screens.
2. Fix cracks and holes in your walls.
3. Never let water stagnate.
4. Get rid of trash properly.
5. Install proper seals on all your doors.
4. Form a group of your friends. Assign tasks to each member of the group to create awareness about cleanliness, hygiene and other methods that can save us from harmful insects.
Answer – Students will do this task under the guidance of subject teacher.