14 - Invertebrates 

In this post, you can check the solutions to the exercises of Invertebrates of Oasis School Science Grade 10 by Jayananda Kapadi.

Group A

1. What are invertebrates? Give one example.
Answer: Animals that lack the vertebral column are called invertebrates. Example: Butterfly.

2. Name two species of silkmoths reared in Nepal.
Answer: Two species of silkmoths reared in Nepal are:
  • Bombyx mori
  • Attacus ricini
3. What is the food of the larva of Seri silkworm?
Answer: The food of the larva of Seri silkworm is Mulberry leaves.

4. Write down the scientific name of Seri silkworm and Eri silkworm.
Answer: The scientific name of Seri silkworm is Bombyx mori and that of Eri silkworm is Attacus ricini.

5. In how many stages does the life cycle of silkmoth complete?
Answer: The life cycle of silkmoth completes in four distinct stages.

6. Write any two characteristics of eggs of silkmoth.
Answer: Any two characteristics of eggs of silkmoth are:
  • The eggs are small and rounded.
  • Eggs are yellowish-white in colour.
7. What is the food of larva of silkmoth?
Answer: The food of the larva of silkmoth is Mulberry leaves.

8. In which stage of life cycle does the silkmoth produce silk thread?
Answer: In pupa stage of life cycle, the silkmoth produces silk thread.

9. What is cocoon? Write its function.
Answer: Cocoon is a covering of the larva of silkworm formed by binding silk secretions around itself. It functions to protect the pupa from its enemies and natural challenges.

10. Write any two characteristics of pupa of silkmoth.
Answer: Any two characteristics of pupa of silkmoth are:
  • It is inactive stage of the life cycle of silkmoth.
  • This stage lasts for about 12-14 days.
11. How many types of honeybees are there in the hive? What are they?
Answer: There are three types of honeybees in the hive. They are: Queen bee, Drone bees, and Worker bees.

12. Write down three characteristics of drone bee.
Answer: Three characteristics of drone bee are:
  • It is the only male bee in the hive.
  • It has functional reproductive organs.
  • Its body is black and hairy.


13. In how many stages does the life cycle of silkmoth complete?
Answer: The life cycle of silkmoth completes in four distinct stages.

14. Write any two characteristics of the egg of honeybee.
Answer: Any two characteristics of the egg of honeybee are:
  • The eggs are elongated.
  • The color of the eggs is white.
15. What is royal jelly?
Answer: Royal jelly is a protein rich, milky secretion secreted by the workers bee that nourishes the upcoming queen bee in its larval stage.

16. In how many days the life cycle of honeybee complete?
Answer: The life cycle of honeybee completes in about 16 to 21 days, depending on the type of bee.

17. What is metamorphosis?
Answer: Metamorphosis is the positive change in the form of an organism that evolves it from an immature form to a mature form in two or more distinct stages.

Group B

1. Why are eggs of silkmoth stored below 18$^o$C in winter season?
Answer: It is done to prevent the hatching of eggs into larvae.

2. Why is the larva of silkmoth called voracious eater?
Answer: The larva of silkmoth is called a voracious eater because it feeds extensively on the mulberry leaves, that doesn't look normal.

3. Write any two differences between larva and egg of silkmoth.
Answer: Any two differences between larva and egg of silkmoth are:
LarvaEgg
Larva of silkmoth is creamy-white in color.Egg of silkmoth is yellowish-white in color.
They feed on the mulberry leaves.Being completely covered by shell, eggs do not feed on anything externally.

4. Why are cocoons kept in hot air before the extraction of silk fibre?
Answer: It is done to kill the germs present in the cocoon. Also, it helps to loosen the fibre which makes it easier to work with later on.

5. Write any two differences between male silkmoth and female silkmoth.
Answer: Any two differences between male silkmoth and female silkmoth are:
Male silkmothFemale silkmoth
The size of male silkmoth is comparatively smaller.Female silkmoth is comparatively larger in size.
It has narrow and long abdomen.It has broad and short abdomen.
[Source: Byjus]

6. Write any two differences between pupa and cocoon.
Answer: Any two differences between pupa and cocoon are:


About this book:

Oasis School Science Grade 10
Author: Jayananda Kapadi
Editor: Dr. Rameshwar Adhikari

About Oasis Publication:

Oasis Publication (P) Ltd.
Anamnagar, Kathmandu, Nepal
Phone: 0977-01-4224004