How Do Organisms Reproduce

Biology
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During adolescence, the body of boys and girls undergoes certain changes. Given below are a few of those changes. Find which changes occur in boys:
(a) Broad shoulders
(b) Wider chests
(c) Broadening of the hip region
(d) Development of muscles
(e) Development of mammary glands
(f) Growth of facial hair
(g) Acne and pimples on the face
(h) Development of sex organs
(i) High-pitched voice
(j) Growth of pubic hair

A
Broad shoulders, wider chests, development of muscles, growth of facial hair, acne and pimples on face, development of sex organs, growth of pubic hair.
B
Broadening of the hip region, broad shoulders, wider chests, development of muscles, growth of facial hair, acne and pimples on the face, development of sex organs, growth of pubic hair.
C
Development of mammary glands, acne and pimples on face, development of sex organs, growth of pubic hair.
D
Broadening of the hip region, broad shoulders, wider chests, development of muscles, growth of facial hair.
Hard
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Contraceptive oral pills help in birth control process by

A
Preventing ovulation
B
Killing the ova
C
Killing the sperms
D
Forming barriers between sperms and ova
Hard
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What could be the reasons for adopting contraceptive methods?

A
To maintain the population size by preventing unwanted pregnancies.
B
To maintain the distance between two children and to plan the family size.
C
To prevent sexually transmitted diseases.
D
All of the above
Hard
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Organisms in population A, have no genetic variations, and organisms of population B, have genetic variations. Based on this information, choose the correct statement.

A
Population A is more stable than population B.
B
Population B is more stable than population A.
C
Both population A and population B are stable.
D
Stability cannot be determined from the presence or absence of variations.
Hard
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