Free Ecosystem (Monthly Quiz: 2) NEET Biology Questions & Answers with Detailed Explanation & Full Review

Question-1

Primary productivity

(a) is greatest in freshwater ecosystems.

(b) is equal to the standing crop of an ecosystem.

(c) is the rate of conversion of light to chemical energy in an ecosystem.

(d) is inverted in some aquatic ecosystems.

Question-2

Pick up the correct food chain

(a) Grass → Fox → Rabbit → Bird

(b) Grass → Chaemeleon → Insect → Bird

(c) Phytoplankton → Zooplankton → Fish

(d) Fallen leaves → Bacteria → Insect larvae

Question-3

The nature of climax community ultimately depends on

(a) bed rock

(b) climate

(c) soil organisms

(d) pool of available nutrients

Question-4

In an ecosystem, organism occupies a specific place in a food chain is called

(a) Progressive straight line

(b) Branching lines

(c) Trophic level

(d) Standing crop

Question-5

About 70% of total global carbon is found in

(a) grasslands

(b) forests

(c) oceans

(d) agroecosystems

Question-6

How many top-carnivores are supported in an above grassland ecosystem based on production of nearly 6 million plants?

(a) 6

(b) 3

(c) 9

(d) 12

Question-7

The climatic factors that regulate soil microbe activities during decomposition are

(a) soil moisture

(b) temperature

(c) Both (a) and (b)

(d) wind

Question-8

Which of the following statements is correct?

(a) Consumers consume energy

(b) Producers produce energy

(c) Decomposers decompose energy

(d) Producers transform energy

Question-9

Match the following columns.

Column I(Seres)	Column II(Features)
A. Xeroseres	1. Ecological succession starts on terrestrial habitat
B. Hydroseres	2. Succession begins from open water bodies
C. Lithoseres	3. Succession begins on sand
D. Psammoseres	4. Succession starts on a bare rock

Codes A B C D

(a) 4 3 1 2

(b) 3 1 2 4

(c) 1 2 4 3

(d) 2 4 3 1

Question-10

Natural reservoir of phosphorus is :

(a) Rock

(b) Animal bones

(c) Fossils

(d) Sea water

Question-11

Which of the following are ecosystem services?

(a) Crop pollination

(b) Purification of air and water by forest

(c) Nutrient cycling

(d) All of these

Question-12

Which of the following most often limits the primary productivity of the ecosystem ?

(a) Oxygen

(b) Solar radiation/light

(c) Consumers

(d) Nitrogen

Question-13

Given below is an imaginary pyramid of numbers. What could be one of the possibilities about certain organisms at some of the different levels?

(a) Level PP is 'phytoplanktons' in sea and 'whale' on top level TC.

(b) Level PC is 'insects' and level SC is 'small insectivorous birds'.

(c) Level one PP is 'pipal trees' and the level SC is 'sheep'.

(d) Level PC is 'rats' and level SC is 'cats'.

Question-14

How much carbon is fixed approximately in biosphere annually through the process of photosynthesis?

(a) 4 × $10^10$ kg

(b) 4 × $10^13$ kg

(c) 4 × $10^8$ kg

(d) 4 × $10^20$ kg

Question-15

The rate at which light energy is converted into chemical energy of organic molecules is the ecosystem's

(a) gross primary productivity

(b) net secondary productivity

(c) net primary productivity

(d) gross secondary productivity.

Question-16

Which of the following is not true for a pyramid of productivity?

(a) Because of the loss of energy at each trophic level, most food chains are limited to three to five steps.

(b) Only about 10% of the energy in one trophic level is passed into the next level.

(c) The pyramid of productivity of some aquatic ecosystems is inverted because of the large zooplankton primary - consumer level.

(d) Eating grain-fed beef is an inefficient means of obtaining the energy trapped by photosynthesis.

Question-17

What price tag did Robert Costanza put for fundamental ecosystem services?

(a) 22 trillion US $

(b) 33 trillion US $

(c) 11 trillion US $

(d) 44 trillion US $

Question-18

The primary difference between sedimentary and atmospheric cycles is that in _____ cycles the nutrient does not _____.

(a) sedimentary; leave the aquatic environment

(b) sedimentary; leave the terrestrial environment

(c) atmospheric; leave the aquatic environment

(d) sedimentary; enter the atmosphere

Question-19

Primary succession on rocks starts with

(a) grass

(b) lichen

(c) mosses

(d) ferns

Question-20

The species that invade a bare area in ecological succession are called

(a) biological species

(b) benthos

(c) seral species

(d) pioneer species