Q41
Which part of the world has a high density of organisms?
Correct Answer
Option D
Solution
(d) Tropical rain forests have highest biodiversity and organism density.
Organisms and Populations
Q42
In which one of the following is nitrogen not a constituent?
Correct Answer
Option B
Solution
(b) Idioblasts contain calcium oxalate crystals — no nitrogen.
Q43
The process of growth is maximum during
Correct Answer
Option D
Solution
(d) Growth rate is maximum during the exponential (log) phase.
Q44
Vivipary is characteristic of halophytes
Correct Answer
Option D
Solution
(d) Vivipary is characteristic of halophytes growing in saline conditions.
Q45
Association of animals when both partners are benefitted
Correct Answer
Option B
Solution
(b) Mutualism: both partners benefit.
Q46
In increasing order of organizational complexity, which one of the following is the correct sequence?
Correct Answer
Option A
Solution
(a) Population → species → community → ecosystem (increasing complexity).
Q47
Which type of association is found between entomophilous flower and pollinating agent?
Correct Answer
Option A
Solution
(a) Flower provides nectar; insect provides pollination — both benefit (mutualism).
Q48
Choose the correct match.
Correct Answer
Option C
Solution
(c) Utricularia (bladderwort), Drosera (sundew), Dionaea (Venus flytrap) are all insectivorous plants.
Q49
Which of the following communities is more vulnerable to invasion by outside animals and plants?
Correct Answer
Option B
Solution
(b) Oceanic island communities are most vulnerable as they are isolated from other habitats.
Q50
Choose the correct sequence of stages of growth curve for bacteria
Correct Answer
Option A
Solution
(a) Bacterial growth: lag → log → stationary → decline phase.
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