Organisms and Populations — Page 3 | NEET Biology

Q21

Presence of plants arranged into well defined vertical layers depending on their height can be seen best in:

A Tropical Rain Forest

B Grassland

C Temperate Forest

D Tropical Savannah

Correct Answer

Option A

Solution

(a) Tropical rainforests have 5 vertical strata — most pronounced stratification.

Q22

Two opposite forces operate in the growth and development of every population. One of them relates to the ability to reproduce at a given rate. The force opposing it is called

A environmental resistance

B morbidity

C fecundity

D biotic potential

Correct Answer

Option A

Solution

(a) Environmental resistance limits population growth opposing biotic potential.

Q23

Two plants can be conclusively said to belong to the same species if they

A have more than 90 per cent similar genes

B look similar and possess identical secondary metabolites

C have same number of chromosomes

D can reproduce freely with each other and form seeds.

Correct Answer

Option D

Solution

(d) Species members are inter-fertile and produce fertile offspring.

Q24

Plants such as Prosopis, Acacia and Capparis represent examples of tropical

A thorn forests

B deciduous forests

C evergreen forests

D grasslands

Correct Answer

Option A

Solution

(a) Prosopis, Acacia and Capparis are non-succulent thorny hot desert/thorn forest plants.

Q25

Mycorrhizae are the example of:

A Amensalism

B Antibiosis

C Mutualism

D Fungistasis

Correct Answer

Option C

Solution

(c) Mycorrhiza is mutualistic association between fungi and plant roots.

Q26

Praying mantis is a good example of

A warning colouration

B social insects

C camouflage

D mullerian mimicry

Correct Answer

Option C

Solution

(c) Praying mantis blends with vegetation — excellent example of camouflage.

Q27

Between which among the following, the relationship is not an example of commensalism?

A Female wasp and fig species

B Orchid and the tree on which it grows

C Cattle egret and grazing cattle

D Sea anemone and clown fish

Correct Answer

Option A

Solution

(a) Female wasp and fig is mutualism (obligate); the rest are commensalism.

Q28

In which one of the following habitats does the diurnal temperature of soil surface vary most?

A Shrub land

B Forest

C Desert

D Grassland

Correct Answer

Option C

Solution

(c) Desert shows maximum diurnal temperature variation due to bare soil and low humidity.

Q29

The sum total of the populations of the same kind of organisms constitute

A colony

B genus

C community

D species

Correct Answer

Option D

Solution

(d) A species is all populations of the same kind of organism that can interbreed.

Q30

A sedentary sea anemone gets attached to the shell lining of hermit crab. The association is :

A Symbiosis

B Commensalism

C Amensalism

D Ectoparasitism

Correct Answer

Option B

Solution

(b) Sea anemone benefits (transport/food); hermit crab is unaffected — commensalism.