- Which horizon of soil profile is the area of maximum leaching?
(a) O-horizon (b) B-horizon
(c) A-horizon (d) C-horizon
- Which type of population interaction is present between
pollinating species of wasp and fig trees?
(a) Commensalism (b) Protocooperation
(c) Competition (d) Symbiosis
- What is the growth equation for a population provided with
unlimited resources?
(a) dN
dt
=rN (b)
dN
dt
rN
KN
K
=
⎛ −
⎝⎜
⎞
⎠⎟
(c) dN
dt
rN
N
K
= −
⎛
⎝⎜
⎞
⎠⎟
1 (d)
dN
dt
=rN− 1
- Proline, useful in maintaining osmotic and water potential
is present in
(a) mesophytes (b) hygrophytes
(c) halophytes (d) xerophytes.
- Cuckoo laying eggs in crow’s nest shows
(a) hyperparasitism (b) holoparasitism
(c) ectoparasitism (d) brood parasitism.
- Urn-shaped age pyramid is possible when
(a) post-reproductive individuals are more than
reproductive individuals.
(b) reproductive individuals are more than pre-
reproductive individuals.
(c) pre-reproductive individual and reproductive
individuals are equal in number.
(d) when pre-reproductive and post reproductive
individuals are equal in number.
- Identify the A, B, C and D in the given table.
Population
interaction
Effect on
species X
Effect on
species Y
Parasitism A –
B ++
Amensalism – C
D ––
A B C D
(a) + Protocooperation 0 Competition
(b) – Commensalism 0 Competition
(c) + Mutualism + Predation
(d) + Mutualism + Predation
- Read the given statements and select the correct option.
Statement A : Cattle do not graze on weed, Calotropis.
Statement B : Calotropis have thorns and spines, as
defense against herbivores.
(a) Both statements A and B are correct and statement
B is the correct explanation of statement A.
(b) Both statements A and B are correct but statement
B is not the correct explanation of statement A.
(c) Statement A is correct but statement B is incorrect.
(d) Both statements A and B are incorrect.
27. Root caps are replaced by root pockets in
(a) Pistia (b) Agave
(c) Opuntia (d) Acacia
28. Which of the following graphs correctly depicts the rate of
respiration (on Y-axis) of a hibernating mammal living in
cold climate?
(a)
(b)
(c)
(d)
- Which among the following is an example of phenotypic
adaptation?
(a) Desert lizards living in burrows to escape heat.
(b) Altitude sickness on going to high altitude.
(c) Excretion of concentrated urine by camels.
(d) Developing ice nucleating proteins in extracellular
spaces in body.
- Petal of Ophrys resembling female bee shows
(a) pseudocopulation
(b) brood parasitism
(c) protocooperation
(d) competition.
ANSWER KEY
- (c) 2. (c) 3. (c) 4. (b) 5. (d)
- (a) 7. (a) 8. (a) 9. (d) 10. (b)
- (b) 12. (c) 13. (b) 14. (a) 15. (d)
- (b) 17. (a) 18. (b) 19. (c) 20. (d)
- (a) 22. (d) 23. (d) 24. (b) 25. (a)
- (c) 27. (a) 28. (d) 29. (b) 30. (a)
