Biology

How Do Organisms Reproduce?

Question:

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.

Answer:

Advantages of vegetative propagation are:

  1. Plants raised by vegetative propa-gation can bear fruits and flowers earlier.
  2.  Plants produced are genetically similar.
    Banana and Rose can be raised by vegetative method.
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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 is the effect of DNA copying which is not perfectly accurate on the reproduction process?

Q 4.

What is the importance of DNA copying in reproduction?

Q 5.

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

Q 6.

What are the advantages of sexual reproduction over asexual reproduction?

Q 7.

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

Q 8.

How does binary fission differ from multiple fission ?

Q 9.

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

Q 10.

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

Q 11.

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

Q 12.

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 13.

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

Q 14.

What are the different methods of contraception?

Q 15.

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

Q 16.

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

Q 17.

How will an organism be benefited if it reproduces through spores?

Q 18.

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

Q 19.

How is the process Of pollination different from fertilization ?

Q 20.

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

Q 21.

State the method used for growing rose plants.

Q 22.

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

Q 23.

(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 24.

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

Q 25.

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 26.

Which of the following is not a pan Of the female reproductive system in human beings ?
(a) Ovary
(b) Uterus
(c) Vas deferens
(d) Fallopian tube

Q 27.

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

Q 28.

What could be the reasons for adopting contraceptive methods?

Q 29.

“Variations that confer an advantage to an individual organism only will survive in a population.” Justify.

Q 30.

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

Q 31.

(a) In the human body what is the role of
(i) seminal vesicles, and (ii) prostate gland?
(b) List two functions performed by testis in human beings.

Q 32.

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 33.

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

Q 34.

What is the role of the seminal vesicles and the prostate gland ?

Q 35.

(a) Draw a diagram showing germination of pollen on stigma of a flower.
(b) Label pollen grain, male germ- cells, pollen tube and female germ-cell in the above diagram.
(c) How is zygote formed?

Q 36.

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

Q 37.

Explain vegetative propagation with the help of two examples. List two advantages of vegetative propagation.

Q 38.

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

Q 39.

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

Q 40.

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

Q 41.

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

Q 42.

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

Q 43.

“DNA copies generated during  reproduction will be similar but may not be identical to the original.” Justify this statement.

Q 44.

List and explain in brief three methods  of contraception.

Q 45.

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 46.

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 47.

Why is variation beneficial to the species but not necessarily for the individual?

Q 48.

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

Q 49.

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

Q 50.

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