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Global Effects of Air Pollution & Climate Change(6)Ecology, Biodiversity & Population Growth(3)

Global Effects of Air Pollution & Climate Change

6 Questions

GATE→2026→Global and Regional Environmental Issues→Global Effects of Air Pollution & Climate Change

Q1

MSQ[1 Mark]

Which of the following statements is/are TRUE about global warming?

(A)

Interception of incoming solar radiation by greenhouse gases in earth's atmosphere is responsible for global warming.

(B)

Interception of outgoing longwave radiation by greenhouse gases in earth's atmosphere is responsible for global warming.

(C)

Global warming can cause sea level rise.

(D)

Carbon dioxide is one of the major greenhouse gases in earth's atmosphere responsible for global warming.

Explanation

GATE→2024→Global and Regional Environmental Issues→Global Effects of Air Pollution & Climate Change

Q2

MCQ[1 Mark]

Which one of the following is NOT a greenhouse gas?

(A)

$CO_2$

(B)

$CH_4$

(C)

$H_2S$

(D)

$H_2O$

Explanation

GATE→2023→Global and Regional Environmental Issues→Global Effects of Air Pollution & Climate Change

Q3

MCQ[1 Mark]

The correct ascending order of the following greenhouse gases with respect to their global warming potential relative to $CO_2$ in the time horizon of 100 years is

(A)

$CH_4 < N_2O < CFCl_3 < CF_2Cl_2$

(B)

$CF_2Cl_2 < CH_4 < N_2O < CFCl_3$

(C)

$CH_4 < N_2O < CF_2Cl_2 < CFCl_3$

(D)

$N_2O < CFCl_3 < CH_4 < CF_2Cl_2$

Explanation

GATE→2023→Global and Regional Environmental Issues→Global Effects of Air Pollution & Climate Change

Q4

MSQ[2 Marks]

Which of the following statements is/are NOT true?

(A)

Urban heat island effect in a city can be reduced by increasing trees and vegetation cover in the city.

(B)

Urban heat island intensity is affected by $PM_{2.5}$ concentrations in a city.

(C)

Urban heat island intensity increases due to installation of reflective roofs in a city.

(D)

In comparison with the non-urban areas, urban heat island effect raises night-time temperatures more than daytime temperatures in cities.

Explanation

GATE→2022→Global and Regional Environmental Issues→Global Effects of Air Pollution & Climate Change

Q5

MCQ[1 Mark]

Which one of the following statements is correct regarding Global warming?

(A)

Water vapour does not contribute to global warming.

(B)

Global warming is likely to increase the productivity of plants due to $CO_2$ fertilization.

(C)

CFCs do not cause global warming, but can cause ozone layer depletion in stratosphere.

(D)

HFCs and HCFCs are good substitutes for the ozone depleting substances as they cause neither global warming nor ozone layer depletion.

Explanation

GATE→2022→Global and Regional Environmental Issues→Global Effects of Air Pollution & Climate Change

Q6

MSQ[2 Marks]

Carbon cycle, nitrogen cycle and phosphorus cycle play important role in the ecosystems. Which of the following statement(s) is/are NOT correct about the phosphorus cycle?

(A)

Shortage of phosphorus can be a limiting factor in many ecosystems, however, its excess can stimulate eutrophication.

(B)

Organic phosphates exist in various rock and soil minerals.

(C)

Like carbon cycle, phosphorus also has a gaseous phase and can move into far away ecosystems.

(D)

Human interventions like application of phosphorus fertilizers cause much phosphorus to get into the ocean.

Explanation

Ecology, Biodiversity & Population Growth

3 Questions

GATE→2026→Global and Regional Environmental Issues→Ecology, Biodiversity & Population Growth

Q7

MCQ[1 Mark]

A species whose impact on an ecosystem is disproportionately large in comparison to its population is called _____ species.

(A)

dominant

(B)

keystone

(C)

apex predator

(D)

endemic

Explanation

GATE→2023→Global and Regional Environmental Issues→Ecology, Biodiversity & Population Growth

Q8

MCQ[2 Marks]

Read the following statements: I. According to the Liebig's law of minimum, the growth is regulated by the limited factors i.e., resources in scarcity and not by the resources in abundance. II. Shelford's law of tolerance states that, only the factors present in excess/abundance can affect the growth, development of an organism or rate of biological process. III. Shelford's law of tolerance states that, an organism's success is based on a complex set of conditions and that each organism has a certain minimum, maximum, and optimum levels of environmental factor or combination of factors that determine success. The correct choice is

(A)

I and II are correct; III is incorrect

(B)

I and III are correct; II is incorrect

(C)

II is correct; I and III are incorrect

(D)

III is correct; I and II are incorrect

Explanation

GATE→2022→Global and Regional Environmental Issues→Ecology, Biodiversity & Population Growth

Q9

MCQ[1 Mark]

In context of ecosystems, which one of the following is NOT a correct statement?

(A)

The growth of an organism such as a plant may be dependent on a number of different factors such as sunlight, mineral nutrients (nitrates, phosphates, etc.), etc. Liebig's law states that, growth occurs at the rate permitted by the most limiting factor.

(B)

The carrying capacity of a population is determined by its limiting resources. Carrying capacity is the upper limit of an ecosystem up to which it can provide basic needs.

(C)

The Ramsar convention on lakes and backwater systems of International importance is an international treaty for the conservation and sustainable use of lakes and backwater systems. The treaty was signed in 1981 and became effective in 1985.

(D)

A Red Data Book contains lists of species whose continued existence is threatened. Species are classified into different categories of perceived risk.

Explanation