Reason : In case timely treatment is not given,
STD may lead to PID, abortions and even cancer of
reproductive tract.
- Assertion : About one third of all pregnancies abort
spontaneously, within 4 weeks of conception.
Reason : A woman may not even know that she is
pregnant, and foetus can abort, with the menses.
- Assertion : Oral contraceptive pills increase the risk
of intravascular clotting.
Reason : They are not recommended for women
with a history of blood clotting, cerebral blood vessel
damage, hypertension and heart disease.
- Assertion : Removal of gonads can be considered as
a contraceptive option.
Reason : An ideal contraceptive should be effective
and irreversible.
- Assertion : Amniocentesis is the prenatal diagnostic
technique that helps to identify chromosomal disorders
only in the foetus.
Reason : It cannot be used for detecting any metabolic
disorders in the foetus.
- Assertion : Cryptorchidism is a condition in which
testes are unable to descend into scrotal sacs.
Reason : This results in oligospermia.
- Assertion : The main factor for the increase of human
population is increase in birth rate.
Reason : Decrease in death rate, both due to decreased
MMR and IMR does not affect the human population
growth rate.- Assertion : If birth and death rates are equal, a zero
population growth rate would result, which is called
demographic transition.
Reason : It is a hypothetical situation and has not
occurred in any country, till date.
Figure Based Questions- Refer to the figure below of different contraceptive
methods and identify A, B, C, D, E and F. - Fill in the blanks using the letters assigned above.
You may also use appropriate phrases, wherever
required.
(a) (i) and (ii) are (iii) releasing contraceptive
devices and increase phagocytosis of sperms
within the uterus.
(b) (iv) , (v) and (vi) are made of rubber, and
inserted into the female reproductive tract to
cover the cervix, before coitus.
(c) (vii) is implanted under the skin of the inner arm,
above the elbow.
sOLUTIOns
CHAPTER-1 : REPRoDuCTIon In oRgAnIsMs
(c) 2. (b) 3. (b) 4. (b) 5. (a)
(d) 7. (c) 8. (d) 9. (c) 10. (d)
(c) 12. (d) 13. (c) 14. (a) 15. (c)
False. Organisms of similar size show different life
span.
False. Bambo species flower only once in their
lifetime, generally after 50-100 years.
True
True
False. Meiosis occurs in both haplontic and haplo-
diplontic life cycles, in the zygote.
False. It can be used interchangably in plants only.
False
23. True
24. False. The basal part of stem should have atleast
one node.
25. False. Stolons are the arched horizontal branches
e.g., in strawberry.
26. A-(vii), B-(vi), C-(v), D-(iv), E-(iii), F-(ii), G-(i)
27. A-(v, xiii), B-(ii, xiv), C-(iii, xii), D-(iv, x), E-(vi, ix),
F-(i, xi), G-(vii, viii)
28.(A) (i) morphallaxis, (ii) epimorphosis, (iii) Zoospores, (iv)
conidia, (v) chlamydospores.
(B) (a) Grafting is successful in monocots dicots and
unsuccessful in dicots monocots, as they have open
closed vascular bundles.
(b) In grafting, scion stock is always older than stock
scion.