Q18 of 27 Page 1

a) Draw the diagram of the female reproductive system and match and mark the part(s):

i) Where the block is created surgically to prevent fertilization.


ii) Where CuT is inserted?


iii) Inside which condom can be placed.


b. Why do more and more people prefer to use condoms? What is the principle behind the use of condoms?

(a) i. Fallopian tubes are cut and tied to prevent the fertilization process.

ii. CuT is inserted in the cervix of the uterus.


Explanation:


The cuT is a contraceptive measure which is placed inside the uterus of the female to block the entrance of sperm.


iii. Vagina is the region where the condom is placed.


Explanation:


The vagina is the only region where serve as the birth canal at the time of birth. A condom is a rubber sheath which placed over the penis to prevent the sperms from entering the vagina and hence it also prevents the process of fertilization. Hence it is also a process of family planning.



(b)


1. A condom is a rubber or polymer sheath which placed over the penis to prevent the sperms from entering the vagina and hence it also prevents the process of fertilization.


2. A condom is one of the safest and easy procedure to avoid fertilization as it does not allow the sperms from entering the vagina.


3. Also at the same time condom prevent the spread of sexually transmitted diseases.


More from this chapter

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16

a. How will you show experimentally that metals are good conductors of heat?

b. Describe the extraction of Mercury metal from its ore Cinnabar (HgS).

 17

A compound A (C2H4O2) reacts with Na metal to form a compound ‘B’ and evolves a gas which burns with a pop sound. Compound ‘A’ on treatment with an alcohol ‘C’ in the presence of acid forms a Sweet-smelling compound ‘D’ (C4H8O2). On addition of NaOH to ‘D’ gives back B and C. Identify A, B, C and D write the reactions involved.

OR


a. Explain why carbon forms a covalent bond? Give two reasons for carbon forming a large number of compounds.


b. Explain the formation of ammonia molecule.

 19

Name the phenomenon that governs the following: - 5

i) Green beetles living in green bushes are not eaten by the crows.


ii) Number of blue beetles in green bushes increases, only because the red beetles living there were trampled by a herd of elephants.


iii) No ‘medium height plants’ are obtained in F1 generation, upon crossing pure tall and dwarf pea plants.


iv) Tails of mice were surgically removed for several generations; still, mice had tails in the following generations.


v) A migrant beetle reproduces with the local population; as result genes of migrant beetle enter the new population.


OR


a) What are fossils and how is the age of fossils determined?


b). During artificial selection, which features of wild cabbage were selected to give rise to i) Cabbage ii) Cauliflower

 20

(a)What is meant by the term ‘power of accommodation’? Name the component of the eye that is responsible for the power of accommodation.

b. A student sitting at the back bench in a class has difficulty in reading. What could be his defect of vision? Draw ray diagrams to illustrate the image formation of the blackboard when he is seated at the (i) back seat (ii) front seat. State two possible causes of this defect. Explain the method of correcting this defect with the help of a ray diagram.