NCERT Ecology Population NCERT Botany,zoology Objective Questions

Ecology Organism and Population Mock Test-3

Question No:1

The salt concentration is measured as salinity in parts per ______.

[A] a) Billion
[B] Million
[C] Hundred
[D] Thousand



Question No:2

The salinity of inland waters is ______

[A] 3
[B] 4
[C] 5
[D] 2



Question No:3

The salinity of sea water is _______

[A] > 100
[B] 30-35
[C] 60-80
[D] 10-15



Question No:4

The salinity of a hyper saline lagoon is

[A] Upto103
[B] >103
[C] Upto102
[D] >102



Question No:5

The organisms which are tolerant of a wide range of salinities are

[A] Salinotrophs
[B] Euryhaline
[C] Salinosomes
[D] Stenohaline



Question No:6

The organisms which are restricted to a narrow range of salinity are known as

[A] Salinosomes
[B] Salinotolerants
[C] Euryhaline
[D] Stenohaline



Question No:7

Fresh water animals cannot live for long in sea water because they would face problems of

[A] Vapour pressure
[B] Purity
[C] Osmotic
[D] Thermal change



Question No:8

Assertion: Photosynthesis is an essential life process of plants.
Reason: Small plants growing in forest are adapted to other process than photosynthesis because they are over-shadowed l_, tall canopied trees. .

[A] A is true and R is also true
[B] R is true and A is false
[C] A is true but R is false
[D] Both A and R are false



Question No:9

For many animals, light is an important factors which regulates _______ variations,

[A] Nocturnal
[B] Diurnal
[C] Urinal
[D] Crepuscular



Question No:10

The activities of animals like foraging, reproductive and migratory depend on

[A] Temperature
[B] Water
[C] Light
[D] Air



Question No:11

Marine organisms, which live at a depth of > m, receive solar energy in which form?

[A] Different rays from visible spectrum
[B] UV radiations
[C] Cosmic rays
[D] Infra Red radiations



Question No:12

The factors which affect percolation and water holding capacity of soil are

[A] Soil composition
[B] Grain size
[C] Aggregation
[D] All of the above



Question No:13

Vegetation in any area depends on

[A] pH of soil
[B] Mineral composition
[C] Topography
[D] All of the above



Question No:14

The ______ characteristics often determine the type of benthic animals than can thrive there

[A] Composition
[B] Sediment
[C] Grain size
[D] Water holding capacity



Question No:15

The internal environment of an organism is called

[A] Equilibrium
[B] Organostasis
[C] Homeostasis
[D] Apoptosis