Reproduction In Animals Class 8th Biology AP Board Solution

Class 8^th Biology AP Board Solution

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1. Gametes and zygote Differentiate between:
2. Sexual reproduction and asexual reproduction Differentiate between:…
3. External fertilization and internal fertilization Differentiate between:…
4. Viviparous and oviparous animals Differentiate between:
5. Compare the reproduction in Hydra and Amoeba. Note down the differences in your notebook.…
6. Why do fish and frog lay more number of eggs whereas cow and human beings usually give…
7. Can animals produce off springs even without formation of zygotes, how? Explain with…
8. How can you identify the animal is viviparous or oviparous.
9. Who am I? a) I am formed by the fusion of male and female gametes... b) I am a gamete that…
10. State the reason why most of the terrestrial animals’ fertilisation takes place…
11. Observe the following figures and write the functions of them.
12. By taking help of the given words label the following life cycle? (eggs, adult, pupa,…
13. Explain the process of metamorphosis in housefly by taking help from in the given diagram.…
14. Match the following
15. What would happen if all the organisms stop the process of reproduction?…
16. Kavitha found a tadpole in a pond. She collected it carefully and put it in an aquarium…
17. Collect information from your library or from other sources like internet and discuss the…
18. Sketch the diagrams of male and female reproductory systems?
19. Draw a labelled diagram of the life history of frog and identify forms are herbivores…
20. How would you appreciate Ritwik’s work when he kept back the pigeon squab in the…

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Question 1.

Differentiate between:

Gametes and zygote

Answer:

Question 2.

Differentiate between:

Sexual reproduction and asexual reproduction

Answer:

Question 3.

Differentiate between:

External fertilization and internal fertilization

Answer:

Question 4.

Differentiate between:

Viviparous and oviparous animals

Answer:

Question 5.

Compare the reproduction in Hydra and Amoeba. Note down the differences in your notebook.

Answer:

Amoeba reproduces by a process known as binary fission in which parent cell divides into two equal daughter cells. Whereas in hydra reproduction occurs by budding.

Binary fission in case of amoeba

Reproduction through budding in case of hydra

In budding, the bud is formed from the parent individual whereas in binary fission no bud formation occurs. In binary fission equal division of cytoplasm takes place whereas unequal division of cytoplasm occurs in case of budding. In budding new individual is formed from old one’s whereas in fission old individual splits to give two new individuals.

Question 6.

Why do fish and frog lay more number of eggs whereas cow and human beings usually give birth to only one at a time?

Answer:

External development of young ones occurs in case of frog and fish due to which its protection from the surrounding decreases. So to cope up with the loss they lay more no. of eggs because not many have a chance to survive. Whereas in case of cow and human beings development occurs inside the mother’s body and the egg is protected. So they give birth to only one at a time.

Question 7.

Can animals produce off springs even without formation of zygotes, how? Explain with suitable example.

Answer:

Yes, some animals can produce offspring even without formation of zygotes. For example, in case of amoeba, the parent cell nuclei divided into two which is followed by the equal cytoplasmic division. The result is the formation of two new daughter cell from the old parent cell with each nuclei i.e., one cell containing one nuclei. These daughter cell will further behave as parent cell and it itself undergoes the same process and results in formation on new daughter cell.

Question 8.

How can you identify the animal is viviparous or oviparous.

Answer:

If an organisms give birth to fully developed young ones they are identified as viviparous. Whereas organism who lay eggs and is hatched in external environment are identified as oviparous. Birds lays eggs and the further development of zygotes occur outside the parents body and when it develops at a certain stage it hatches out. This is an example of oviparous. In case of mammals the zygotes and developed inside females body and when it attains a certain stage of development it is expelled from the female’s body.

Question 9.

Who am I?

a) I am formed by the fusion of male and female gametes...

b) I am a gamete that has a tail and travel to fuse with female gamete...

c) I am a fully developed embryo inside a mother’s body...

Answer:

(a) Zygote

(b) Sperm

(c) Fetus or a baby

Question 10.

State the reason why most of the terrestrial animals’ fertilisation takes place internally.

Answer:

The environment on terrestrial land keeps on changing than that of the marine environment. So inorder to increase the survival chance of the fertilization (internal environment is nearly constant) terrestrial animals’ fertilization takes place internally.

Question 11.

Observe the following figures and write the functions of them.

Answer:

A) testis- production of sperms.

B) fallopian tube – captures mature ova after it is released from the ovary and provides the site of fertilization.

C) sperm – male gamete that fertilizes female gamete ova.

D) fertilization – one of the sperm fertilizes ova and results in zygote formation which will further developed into young ones.

Question 12.

By taking help of the given words label the following life cycle?

(eggs, adult, pupa, larva)

Answer:

Question 13.

Explain the process of metamorphosis in housefly by taking help from in the given diagram.

Answer:

Metamorphosis is the process by which the immature forms develop into an adult. The adult male and female produces gametes which are haploid (n). the gametes then fertilize and form a zygote (2n). After 1-2 days of fertilization, the zygote will develop into a larva which is segmented, have mouth hooks, and actively feed. after the larval stage comes the pupa stage in which the body is enclosed in a puparium (outer hard shell) and is inactive and immature. After the pupa states the adult comes out from the puparium by breaking it.

Question 14.

Match the following

Answer:

Question 15.

What would happen if all the organisms stop the process of reproduction?

Answer:

If all organisms stop the process of reproduction the there will be no organism left and it will lead to extinction.

Question 16.

Kavitha found a tadpole in a pond. She collected it carefully and put it in an aquarium supposing it as a fish. After some days what did she find and why?

Answer:

The tadpole is the intermediate stage in the life cycle of a frog. So the tadpole that Kavitha has collected will develop into an adult frog.

Question 17.

Collect information from your library or from other sources like internet and discuss the life cycle of Honeybees in the symposium at your school.

Answer:

Question 18.

Sketch the diagrams of male and female reproductory systems?

Answer:

MALE REPRODUCTIVE SYSTEM

Question 19.

Draw a labelled diagram of the life history of frog and identify forms are herbivores

Answer:

Adult frogs are carnivores whereas tadpole are herbivores.

Question 20.

How would you appreciate Ritwik’s work when he kept back the pigeon squab in the ventilator? If you were in Ritwik’s place what would you do?

Answer:

Before keeping pigeon squab one must know everything about them live the conditions in which they grow, feeding habits, breeding habits and should take a proper check on the environment.

By the action of Ritwik, we can say that he has an interest in birds and like to keep them.

I would have done the same what ritwik has done.