Q21 of 61 Page 1

(a) Name, the respective part of human female reproductive system:

(i) that produces eggs.


(ii) where fusion of egg and sperm takes place, and


(iii) where zygote get implanted.


(b) Describe in brief what happens to the zygote after it gets implanted.

(a) Part of human female reproductive system :

(i) Part of human female reproductive system that produces eggs is Ovary


(ii) Part of human female reproductive system where fusion of egg and sperm takes place is Fallopian tube


(iii) Part of human female reproductive system where zygote gets implanted is Uterus


(b) After zygote implantation, there is a development of a disc like tissue known as Placenta which connects the mother and the Foetus through umbilical cord. Placenta helps in exchange of nutrients, Oxygen and waste products between mother and the embryo.


More from this chapter

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19

State the reason why carbon can neither form C4+ cations nor C4- anions, but forms covalent compounds. Also state reasons to explain why covalent compounds:

(a) are bad conductors of electricity?


(b) have low melting and boiling points?

 20

(a) Give one example each of a unisexual and a bisexual flower.

(b) Mention the changes a flower undergoes after fertilization.


(c) How does the amount of DNA remains constant though each new generation is a combination of DNA copies of two individuals?

 22

A student wants to project the image of a candle flame on the walls. of school laboratory by using a lens:

(a) Which type of lens should he use and why?


(b) At what distance in terms of focal length 'F' of the lens should he place the candle flame so as to get


(i) a magnified, and (ii) a diminished image respectively on the wall?


(c) Draw ray diagram show the formation of the image in each case.

 23

(a) List three common refractive defects of vision. Suggest the way of correcting these defects.

(b) About 45 lac people in the developing countries are suffering from corneal blindness.


About 30 lac children below the age of 12 years suffering from this defect can be cured by replacing the defective cornea with the cornea of a donated eye. How and why can students of your age involve themselves to create awareness about this fact among people?