biology - how do organisms reproduce?

Class 10 - Biology

How Do Organisms Reproduce?

Q&A
Question:

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?  

Answer:

(a) Four reasons for adopting contra ¬ceptive methods are:
(i) To increase the gap between, two children.
(ii)To prevent unwanted preg ¬nancy.
(iii)To prevent transmission of STDs.
(iv)To control population growth. (b) If a woman is using a copper-T,
it will not help in protecting her from sexually transmitted diseases. Copper-T prevents only implantation in the uterus.



--- >>>

Questions and Answers


How Do Organisms Reproduce? - Questions
1.

How is the process Of pollination different from fertilization ?


Answer
2.

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


Answer
3.

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


Answer
4.

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


Answer
5.

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


Answer
6.

What is regeneration? State a reason why a more complex organism cannot give rise to new individuals through this method.


Answer
7.

Asexual reproduction takes place through budding in :
(a) Amoeba
(b) Yeast
(c) Plasmodium
(d) Leishmania.


Answer
8.

What are the different methods of contraception?


Answer
9.

(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?


Answer
10.

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


Answer
11.

(a) Name the parts labelled A, B, C, D and E.
how-do-organisms-reproducechapter-wise-important-questions-class-10-science-8
(b) Where do the following functions occur?
(i) Production of an egg
(ii) Fertilisation
(iii) Implantation of zygote.
(c) What happens to the lining of uterus:
(i) before release of a fertilised egg?
(ii) if no fertilisation occurs?


Answer
12.

Write any two differences between binary fission and multiple fission in a tabular form as observed in cells of organisms.


Answer
13.

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


Answer
14.

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.


Answer
15.

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


Answer
16.

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?  


Answer
17.

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


Answer
18.

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


Answer
19.

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


Answer
20.

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


Answer
21.

List any three differences between pollination and fertilisation.


Answer
22.

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


Answer
23.

(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.


Answer
24.

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


Answer
25.

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?


Answer
26.

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


Answer
27.

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


Answer
28.

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


Answer
29.

What could be the reasons for adopting contraceptive methods?


Answer
30.

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


Answer
31.

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


Answer
32.

State the method used for growing rose plants.


Answer
33.

Name the largest cell present in the human body.


Answer
34.

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


Answer
35.

(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.


Answer
36.

List and explain in brief three methods  of contraception.


Answer
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?


Answer
38.

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


Answer
39.

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


Answer
40.

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


Answer
41.

What are the advantages of sexual reproduction over asexual reproduction?


Answer
42.

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


Answer
43.

Draw a longitudinal section of a flower and label the following parts:
(i) Part that produces pollen grain.
(ii)Part that transfers male gametes to the female gametes.
(iii) Part that is sticky to trap the pollen grain.
(iv) Part that develops into a fruit.


Answer
44.

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


Answer
45.

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


Answer
46.

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.


Answer
47.

Why does menstruation occur?


Answer
48.

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


Answer
49.

Write the full form of DNA. Name the part of the cell where it is located. Explain its role in the process of reproduction of the cell.


Answer
50.

(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.


Answer