Free Organisms And Populations (Weekly Quiz: 2) NEET Biology Questions & Answers with Detailed Explanation & Full Review

Question-1

Formation of tropical forests needs mean annual temperature and mean annual precipitation as

(a) 5 - 15°C and 50 - 100 cm

(b) 18 - 25°C and 150 - 400 cm

(c) 30 - 50°C and 100 - 150 cm

(d) 5 - 15°C and 100 - 200 cm

Question-2

The plant-animal interaction often involve coevolution of the mutualists, so that

(a) a given plant species can be pollinated only by its partner animal species and no other species

(b) the mutually beneficial system could be safeguarded against cheaters

(c) the animal utilises plant not only for oviposition but also to pollinate the plant

(d) All of the above

Question-3

The main reason behind building burrows in soil by burrowing animals is __________.

(a) To derive nutrition parts of plants from underground.

(b) To escape from predators.

(c) The mode of evolution chose burrows as a specific habitat.

(d) To hide and escape from the above-ground heat.

Question-4

Ecotone is

(a) the bottom of a lake

(b) a polluted area

(c) a zone of transition between two communities

(d) a zone of developing community

Question-5

Soil is composed of –

(a) Mineral + Organic matter + Water

(b) Mineral + Water + Air

(c) Mineral + Organic matter + Air + Water

(d) Organic matter + Water

Question-6

Gause’s ‘competitive exclusion principle’ states that

(a) in a competition for similar resource both the participants are benefitted.

(b) humans are the most widespread agents of disturbance.

(c) in a competition, both the participants are excluded.

(d) two closely related species competing for the same resources cannot co-exist indefinitely and competitively inferior one will be eliminated eventually

Question-7

Mycorrhizae are the example of:

(a) Antibiosis

(b) Amensalism

(c) Mutualism

(d) Fungistasis

Question-8

In the models that describe population growth, r stands for

(a) a time interval.

(b) population density.

(c) total number of individuals in the population.

(d) growth rate.

Question-9

Niche overlap indicates

(a) active cooperation between two species

(b) mutualism between two species

(c) two different parasites on the same host

(d) sharing of one or more resources between the two species.

Question-10

Read the following statements about 'recent studies supporting competition' as suggested in 'Gause's competitive exclusion principle'.

1. Gause's hypothesis says if two species compete for same resources then one will be eliminated by another species.
2. More recent studies point out that species facing competition might evolve mechanismsthat promote coexistence rather than exclusion.
3. Gause's competitive exclusion principle is effective when resources are in excess.
4. Unlimited resources give better opportunity for adaptation.

Choose the correct combination of statements.

(a) I, II and IV

(b) I and II

(c) III and IV

(d) I and IV