Biology

How Do Organisms Reproduce?

Question:

Why does menstruation occur?

Answer:

If the egg is not fertilized and uterus does not get zygote, the developed lining slowly breaks and menstruation occur.

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How Do Organisms Reproduce?

Q 1.

How are the modes for reproduction different in unicellular and multicellular organisms ?

Q 2.

Name the largest cell present in the human body.

Q 3.

What are the advantages of sexual reproduction over asexual reproduction?

Q 4.

The anther contains :
(a) Sepals
(b) Ovules
(c) Carpel
(d) Pollen grains.

Q 5.

What is the effect of DNA copying which is not perfectly accurate on the reproduction process?

Q 6.

Define the term puberty. List two  changes observed in girls at the time of puberty.

Q 7.

List two advantages of practising vegetative propagation in plants. Select two plants raised by this method from the list given below:
Banana, Gram, Pea, Rose, Tomato, Wheat.

Q 8.

State one genetically different feature between sperms and eggs of humans. What is its consequence?

Q 9.

How does binary fission differ from multiple fission ?

Q 10.

How does reproduction help in providing stability to populations Of species?

Q 11.

Expand AIDS. List any four methods of prevention (control) of AIDS.

Q 12.

What is meant by asexual reproduction? List its any two different forms.

Q 13.

What is ‘reproduction’? Mention the importance of DNA copying inreproduction.

Q 14.

With the help of suitable diagrams, explain the various steps of budding in Hydra.

Q 15.

What are the different methods of contraception?

Q 16.

Define the terms unisexual and bisexual giving one example of each.

Q 17.

What is reproduction? What are its two types? Which one of the two confers new characteristics on the offsprings and how?

Q 18.

Why is DNA copying an essential part of the process of reproduction?

Q 19.

What is the importance of DNA copying in reproduction?

Q 20.

What is AIDS? Which microbe is responsible for AIDS infection? State one mode of transmission of this disease. Explain in brief one measure for the prevention of AIDS.

Q 21.

Mention the mode of reproduction used by
(a) Amoeba (b) Planaria.

Q 22.

Name the information source of making proteins in the cell. State two basic events in reproduction.

Q 23.

List the parts of human male reproductive system which contribute fluid to the semen. State two advantages semen offers to the sperms.

Q 24.

Why is vegetative propagation practised for growing some type of plants?

Q 25.

What are the changes seen in girls at the time Of puberty ?

Q 26.

If a woman is using a copper-T will it help in protecting her from sexually transmitted diseases?

Q 27.

What could be the reasons for adopting contraceptive methods?

Q 28.

(a) Explain the role of placenta in the development of human embryo.
(b) Give example of two bacterial and two viral sexually transmitted diseases. Name the most effective contraceptive which prevents spread of such diseases.

Q 29.

How is the process Of pollination different from fertilization ?

Q 30.

How does the embryo get nourishment inside the Mother’s body?

Q 31.

Differentiate between ‘self-pollination’ and ‘cross-pollination’. Describe double fertilisation in plants.

Q 32.

State what type of method is used for growing jasmine plant.

Q 33.

What are sexually transmitted diseases?
Name four such diseases. Which one of them damages the immune system of human body?

Q 34.

List any four modes of asexual reproduction.

Q 35.

List two advantages of vegetative  reproduction practised in case of an orange plant.

Q 36.

How does growing embryo get nutrition from the mother’s blood?

Q 37.

Draw a diagram of a human female reproductive system and label the part
(i) that produces egg
(ii) where fusion of egg and sperm take place
(iii) where zygote is implanted
What happens to human egg when it is not fertilised?

Q 38.

State in brief the changes that take place in a fertilised egg (zygote) till birth of the child in the human female reproductive system. What happens to the egg when it is not fertilised?

Q 39.

Can you think of reasons why more complex organisms cannot give rise to new individuals through regeneration?

Q 40.

What are the functions performed by the testes in human beings?

Q 41.

Name the two types of germ-cells present in human beings. How do they structurally differ from each other? Give two differences.

Q 42.

Describe in brief the role of (i) testis (ii) seminal vesicle, (iii) vas deferens, (iv) ureter and (v) prostate gland in human male reproductive system.

Q 43.

Name one sexually transmitted disease each caused due to bacterial infection and viral infection. How can these be prevented?

Q 44.

(a) Explain the terms:
(i) Implantation (ii) Placenta
(b) What is the average duration of human pregnancy?

Q 45.

List any four reasons for vegetative propagation being practised in the growth of some type of plants.

Q 46.

What does HIV stand for? Is AIDS an infectious disease? List any four modes of spreading AIDS.

Q 47.

a) List any four reasons for adopting contraceptive methods.
(b) If a woman is using Copper-T, will it help in protecting her from sexually transmitted diseases? Why?  

Q 48.

Explain the following methods of contraception giving one example of each:
(i) Barrier method
(ii) Hormonal imbalance method
(iii) Surgical method.

Q 49.

(a) What is fragmentation in organism?
Name a multicell-ular organism which reproduces by this method.
(b) What is regeneration in organism? Describe regeneration in Planaria with the help of a suitable diagram.

Q 50.

Name an organism which reproduces by spore formation. List three conditions favourable for spores to germinate and grow.