Ecology Questions for CSIR NET

Dear Students,
Welcome to Ecology MCQ-12 (Ecology Questions for CSIR NET). This MCQ set consists of Advanced Ecology / Conservation Biology / Environmental Sciences Questions taken from the previous year question papers of CSIR NET Life Sciences Examination. These questions can be used for the preparation of CSIR NET, ICMR JRF, DBT BET JRF, and GATE.

You may also like: Ecology CSIR NET Questions Part 1 | Part 2

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Three Indian animals – cormorant, lion-tailed macaque and gerbil are to be matched with the ecosystem they inhabited – Wetland (A), Desert (B), Deciduous forest (C), or Rain forest (D). Which of the following is the correct match of the animal with its habitat? (CSIR_2015_I)

Cormorant – D; Lion-tailed macaque – C; Gerbil – B

Cormorant – A; Lion-tailed macaque – C; Gerbil – D

Cormorant – A; Lion-tailed macaque – D; Gerbil – B

Cormorant – B; Lion-tailed macaque – C; Gerbil – D

None

Which of the following set of observations is true with reference to a comparison of aquatic (A) and a terrestrial (T) ecosystems? (CSIR_2015_I)

Number of trophic levels is more in A than in T; Productivity/Biomass ratio is higher in T than in A; Herbivore assimilation efficiency is higher in A than T

Number of trophic levels is more in A than in T; Productivity/Biomass ratio is greater in A than in T; Herbivore assimilation efficiency is higher in T than in A

Number of trophic levels is more in T than in A; Productivity/Biomass ratio is higher in T than in A; Herbivore assimilation efficiency is higher in T than in A

Number of trophic levels is more in A than in T; Productivity/Biomass ratio is greater in A than in T; Herbivore assimilation efficiency is higher in A than in T

None

According to 2014 IUCN Red List, which of the following vertebrate classes has the largest percentage of threatened species? (CSIR_2015_II)

Mammals

Birds

Reptiles

Amphibians

None

Which gas does NOT contribute to global warming through its greenhouse effect? (CSIR_2015_II)

Nitrous oxide

Methane

Carbon dioxide

Nitric oxide

None

A red coloured tubular flower without any odour is most likely to be pollinated by (CSIR_2015_II)

Beetles

Bees

Butterflies

Birds

None

A small lake has three trophic levels – phytoplankton (autotrophs), zooplankton (herbivores) and plantovorous fish (primary carnivore). Into this lake, a population of piscivorous fish (secondary carnivore) was introduced to study the ‘top-down effects’. What is the expected long term consequence of such an introduction to phytoplankton and zooplankton trophic levels? (CSIR_2015_I)

Zooplankton biomass will increase and phytoplankton biomass will decrease

Zooplankton biomass will decrease and phytoplankton biomass will increase

The biomass of both zooplankton and phytoplankton will increase

The biomasses of both zooplankton and phytoplankton will decrease

None

The utilization or consumption efficiency of herbivores is highest in: (CSIR_2016_I)

Plankton communities of ocean waters.

Mature temperate forests.

Managed grasslands.

Managed rangelands.

None

In which ecosystem is the autotroph-fixed energy likely to reach the primary carnivore level in the shortest time? (CSIR_2016_I)

Temperate deciduous forest

Grassland

Ocean

Tropical rain forest

None

A population is growing logistically with a growth rate (r) of 0.15/week, in an environment with a carrying capacity of 400. What is the maximum growth rate (No. of individuals/week) that this population can achieve? (CSIR_2015_II)

22.5

None

10.

In a field experiment, autotrophs are provided a 14C-labelled carbon compound for photosynthesis. Radioactivity (14C) levels were then monitored at regular intervals in all the trophic levels. In which ecosystem is the radioactivity likely to be detected fastest at the primary carnivore level? (CSIR_2015_II)

Open ocean

Desert

Deciduous forest

Grassland

None

11.

For a population growing exponentially with a growth rate r, its population doubling time is: (CSIR_2016_I)

(N0 X 2)/r

In 2/r

λ In 2

In r X 2

None

12.

Which of the following global hotspots of biodiversity has the highest number of endemic plants and vertebrates? (CSIR_2016_I)

Sundaland

Tropical Andes

Brazil’s Atlantic Forest

Mesoamerican forests

None

13.

If gypsy moth egg density is 160 at time t and 200 at t + 1, what will be its value at time t + 3, assuming that egg density continues to increase at constant rate? (CSIR_2016_I)

250

280

312

390

None

14.

The approximate P:B (Net Primary Production: Biomass) ratios in four different ecosystems (A, B, C, D) are A – 0.29; B – 0.042, C – 16.48; D – 8.2. The four ecosystems are: (CSIR_2016_I)

A – Ocean; B – Lake; C – Grassland; D – Tropical forest

A – Grassland; B – Tropical forest; C – Ocean; D – Lake

A – Tropical forest; B – Ocean; C – Grassland; D – Lake

A – Grassland; B – Ocean; C – Lake; D – Tropical forest

None

15.

Which of the following statements is INCORRECT about a keystone species? (CSIR_2017_II)

Species other than consumers can be a keystone species

Keystone species has influence on a community proportionate to its abundance

Removing a keystone species can reduce species richness of a community

Removing a keystone species can effect successive trophic levels causing a trophic cascade

None

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Ecology CSIR NET Questions (Part-1)
CSIR NET Ecology Questions (Part-2)
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MCQ on Community Ecology (Synecology)
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Ecology Questions for CSIR NET (Part-3)

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