Important Questions Answer of Biology Class 10 | Invertebrates | SEE

Invertebrates

1. Useful insects/ invertebrates:-

  • Silkworm
  • Honeybee, etc.

2. Honeybee:

is social insects because it has division of labour. The queen workers and drones have distinct roles in honey-comb.

3. Apiculture:

The cultivation of Honey-bees

4. Sericulture:

The cultivation of silkworm.

5. Life cycle:

Completed in four stages:-

6. Puparium:

The outer coat of pupa is called puparium.

7. Classification of silkworm and Honey bee:-

Silkworm

  • Kindom:- Amialia
  • Sub-kingdom:- Invertebrata
  • Phylum:- Arthopoda
  • Class:- Insecta
  • Types: silkworm.

Honeybee

  • Kingdom:- Animalia
  • Sub-kingdom:- Invertebrata
  • Phylum:- Arthopoda
  • Class:- Insecta
  • Type:- Honeybee

8. Body is divided into three distinct parts:-

  • Head:- Compound eyes, a pair of antenna, and the mouth parts.
  • Thorax:- It contains three pairs of jointed legs.
  • Abdomen:- The abdomen is segmented.

9. Metamorphosis:-

The metamorphosis is the important events in the life cycle of insects. The change from eggs to adults is the result of metamorphosis.

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10. Silkworm/ silk moth:-

  • Its body is white creamy and 15 mm long.

Eggs:- a) Female lays 300 to 400 eggs at a time on the malberry/ leaves.

b) At temperature 18º to 25ºc, eggs are hatched into larva after 10-12 days.

  • Larvara:- a) It lives on mulberry/ leaves and it changes its skin four times that is called moalting.

b) It wrap skill thread to its body and converted into cocoon.

c) The silkworm need one month to complete larva stages, etc.

  • Pupa:- a) It is an inactive stage of life cycle. This stage is completed in 12 to 14 days.

b) The cover of pupa is called puparium. The pupa stage is also called cocoon stage.

c) The cocoon is the pupa stage and it is inactive stage. The silk is obtained from single cocoon. We put cocoon in warm water to kill larva present inside of cocoon.

d) Diagram:-

Advantages:-

  • Its thread is used to produce costly clothes.
  • It is used in surgery to sticking cot.
  • Improve economic condition of farmer.
  • It is also used in phishing, etc.

Feature of silk thread:-

  • The thread is protenous, light, and strong.
  • It has special shining.
  • It can be coloured easily.
  • It absorbs water redily.
  • Silk clothes are suitable for all seasons.

11. Honey bee:-

a. Development of honey bee:-

Bee Eggs Larva Pupa Total days
Queen

Workers

Drones

3

3

3

5-1/2

6

6

7-1/2

12

14-1/2

16

21

23-1/2

b. Work division:-

Bee and age Function
Drone
  • It make live warm and copulate with queen.
Queen
  • The queen is responsible for laying eggs and managing hive, It produces different types of smell for hive management.
Workers (1-3 days)
  • In this stage these bees are called bady – bees. They are very weax, so they start to walk, attach with hive, provide warmth to eggs, larva, and pupa. they eat surrounding foods and clean bee hives.
4-6 days
  • They feed honey and bee bread to developing larva and they eat themselves too.
7-11 days
  • Head glands developed and produce Royal jelly and they eat themselves too.
12-17 days
  • Head gland become dry.
  • Four pairs of wax glands are produced in the abdomen to produce wax.
  • Wax is used to make hive.
18-20 days
  • Wax glands become dry.
  • Poison glands are developed to protect hive
21 day
  • They start to emerge from hive for collection of necter and water.

c. Mating flight/ Nuplial flight:-

The mating of queen with drone in air is called mating nuptical flight in which eggs are fertilized. After fertilizing eggs, drones are died.

d. Drone cell:-

the queen lay eggs in drone cells for new drones.

  • Worker cell:-

The queen lays eggs in worker cell for future workers.

  • Queen cell:-

The egg laid in queen cell is developed in queen.

e. Chromosome:-

In honey bee, there is a 32 (16 pairs) chromosome. The chromosome carries genetic material from generation to generation.

f. Royal jelly:-

  • A substance secreted by bees to aid in the development of immature or young bees supplied in extra meal to those that will become queen bee.
  • It is secreted by Hypophyrax of nurse bee.

g. Bee-bread:-

A mixture of nectar and pollen made by workers bee and used as food for larva.

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