Assignment (Biology)

                                             Class-x     

                        How do organisms reproduce?

1.    Why do organisms reproduce?

2.    What is the basic event that takes place during reproduction? How is it important?

3.    Copying of DNA inherits similar characters in new individuals, still they are different from their parents. Give reasons.

4.    What are variations? How are they important for species?

5.    Variations are not important for one individual but they are important for species. Justify.

6.    What is difference between fission taking place in Amoeba & Leishmania?

7.    Differentiate between Fragmentation & Regeneration.

8.    Why regeneration is not considered a method of Reproduction?

9.    Write two advantages of vegetative propagation.

10.  Vegetative propagation slows down the process of evolution.  Give reasons.

11.  Sexual mode of reproduction increases the number of variations. Explain.

12.  Write down the advantages of Sexual Reproduction.

13.  Name two unisexual & bisexual flowers.

14.  What are the post fertilization changes that take place in a flower?

15.  Which part of embryo produces shoot system and root system?

16.  List 2 similar changes that take places in human males and females after puberty.

17.  What is placenta? Write its functions.

18.  Give any two reasons to maintain good reproductive health.

19.  Name three sexually transmitted diseases and their causes.

20.  Explain different contraceptive methods.

21.  Expand the following terms:

           1.STD

           2.IUCD

           3.AIDS

           4.HIV

22.  Differentiate between menarche and menopause.

23.  Explain mode of reproduction in Rhizopus.

24.  What happens to the wall of uterus if no fertilization takes place?

25.  Write the function of i) serotum  ii) prostrate gland iii) seminal vesicles  iv) vas deferens

26.  Draw neat and labeled diagrams of male and female reproductive system.

27.  Differentiate between self pollination and cross pollination.

28.  Define vegetative propagation. Write its significance.

29.  Draw a diagram showing the process of germination of pollens on stigma.

30.  Draw longitudinal section of flower and mention its male and female parts.

31.  How does the embryo get nourishment inside the mother’s body?

32.  Why are testes located outside the abdomen?

33.  What is tubectomy?

34.  If a women using a copper-T, how will it prevent pregency? What side effect is caused by it?

35.  Write any two common features which develop during puberty in boys and girls?

36.  Distinguish between a gamete and a zygote.

37.  Fertilization in humans can occur only once in a mouth. Why?

38.  What substances are contained i) in oral pills, and ii) in vaginal pills, used as contraceptives? How do they work?

39.  The human males use a device X made of a very thin rubber sheet as a covering on the male organ to prevent pregnancy. This device traps the gametes Y in it. In order to prevent pregnancy, the human females use a device Z which is a circle of rubber with a metal spring around it. The device Z is put inside the vagina to cover the cervix. It stops Y from going into the uterus. What is device X, Y and Z?