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Test: Energy Flow (NCERT) - NEET MCQ


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15 Questions MCQ Test Biology Class 12 - Test: Energy Flow (NCERT)

Test: Energy Flow (NCERT) for NEET 2024 is part of Biology Class 12 preparation. The Test: Energy Flow (NCERT) questions and answers have been prepared according to the NEET exam syllabus.The Test: Energy Flow (NCERT) MCQs are made for NEET 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Energy Flow (NCERT) below.
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Test: Energy Flow (NCERT) - Question 1

Given figure represents food chains of a deciduous woodland linked together to form a food web.

Which of the following constitute first trophic level of the grazing food chain and the detritus food chain respectively? 

Detailed Solution for Test: Energy Flow (NCERT) - Question 1

In grazing food chain (GFC), producers constitute the first trophic level whereas detritus food chain (DFC) begins with detritus or dead organic matter.

Test: Energy Flow (NCERT) - Question 2

Study the food web given below and answer the questions that follow.

Which of the following organisms in the given food web acts as a secondary consumer?

Detailed Solution for Test: Energy Flow (NCERT) - Question 2

In the given food web, organisms I (phytoplanktons) act as producers, organisms II, V and VII act as primary consumers as they feed on producers, organisms III and VI act as secondary consumers as they upon primary consumers, and organism IV acts as a tertiary consumer.

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Test: Energy Flow (NCERT) - Question 3

Percentage of photosynthetically active radiation (PAR) in the incident solar radiation is

Detailed Solution for Test: Energy Flow (NCERT) - Question 3

Less that 50% of the solar energy incident over earth is PAR (photosynthetically active radiation).

Test: Energy Flow (NCERT) - Question 4

Percentage of photosynthetically active radiation (PAR) that is captured by plants in synthesis of organic matter is?

Detailed Solution for Test: Energy Flow (NCERT) - Question 4

About 1−5% of incident solar energy or 2−10% of PAR is captured by the photosynthetic organisms for the synthesis of organic matter(Gross primary productivity). Roughly 20% of it is consumed in respiration so that net capture of energy(net primary productivity) is 0.8−4% of incident radiation or 1.6−8% of PAR.

Test: Energy Flow (NCERT) - Question 5

Read the following statements and select the correct ones.
(i) A given species may occupy more than one trophic level in the same ecosystem at the same time.
(ii) Productivity of an aquatic ecosystem is less than that of a terrestrial ecosystem.
(iii) Producers constitute the first trophic level of a detritus food chain.

Detailed Solution for Test: Energy Flow (NCERT) - Question 5

Decomposers and detritivores constitute the first trophic level of a detritus food chain.

Test: Energy Flow (NCERT) - Question 6

If 10 joules of energy is available at the producer level, then amount of energy present at the level of secondary consumer is

Detailed Solution for Test: Energy Flow (NCERT) - Question 6

Only 10 % of energy is transferred from one trophic level to the next trophic level of a food chain (ten percent law, given by Linderman). In present case, energy available at producer level is 10 J. Hence energy at primary consumer level would be 1 H (10% of 10 J). Similarly, at secondary consumer level, energy present will be 0.1 J (100 % of 1 J).

Test: Energy Flow (NCERT) - Question 7

Organisms which are associated with first as well as third trophic level are

Detailed Solution for Test: Energy Flow (NCERT) - Question 7

Trophic level is a functional level. A single species may occupy more than one trophic level. Insectivorous plants are producers, occupying first trophic level. They also eat insects and thus, occupy third trophic level also.

Test: Energy Flow (NCERT) - Question 8

In the given food web, an increase in the population of hawks will not result in

Detailed Solution for Test: Energy Flow (NCERT) - Question 8

If population of hawks would increase, they would feed on more grasshoppers which will result in decrease of grasshoppers population, so option C is wrong

Test: Energy Flow (NCERT) - Question 9

In a grassland ecosystem, if the number of primary producers is approximately 6 million plants, the number of the top carnivores (in million), which may be supported by it may be ________ million.

Detailed Solution for Test: Energy Flow (NCERT) - Question 9

In a grassland ecosystem, the pyramid of numbers is upright. If primary producers are approximately 6 million plants, then number of top carnivores must be less than 6 milliion. Hecne, according to the option given, there would be 3 million top carnivores.

Test: Energy Flow (NCERT) - Question 10

Which one of the following animals may occupy more than one trophic levels in the same ecosystem at the same time?

Detailed Solution for Test: Energy Flow (NCERT) - Question 10

A single species may occupy more than one trophic level. Sparrow being omnivorous can be a primary consumer if it feeds on seeds, fruits and peas or a secondary consumer if it feeds on insects and worms.

Test: Energy Flow (NCERT) - Question 11

Study the following statements concerning food chains and select the correct ones.
(I) Removal of 80% tigers from an area resulted in greatly increased growth of vegetation.
(II) Removal of most of the carnivores resulted in an increased population of deers.
(III) the length of food chains is generally limited to 3-4 trophic levels due to energy loss.
(IV) the length of food chains may vary from 2 to 8 trophic levels. 

Detailed Solution for Test: Energy Flow (NCERT) - Question 11

If carnivores, which feed on deers are removed, then the deer population will flourish. Removal of 80% of tigers from an area will cause increase in population of herbivores, which would further feed more on vegetation, decreasing its growth. The length of food chain is limited to 3-4 trophic levels as only 10% of energy is transferred to next trophic level. Hence after 3-4 trophic levels there is very little or no energy left to sustain more trophic levels. 

Test: Energy Flow (NCERT) - Question 12

Given food web contains some missing organisms, (1), (2), (3) and (4). Identify these organisms and select the correct answer.


Detailed Solution for Test: Energy Flow (NCERT) - Question 12

A lion feeds on a deer.
Deer are the primary consumer.
Fox acts a secondary consumer and feeds on a primary consumer such as Rabbit.
Frog feeds on a grasshopper and acts as a primary consumer.
Rat acts as prey for both Snake and a hawk.

Test: Energy Flow (NCERT) - Question 13

Match column I with column II and select the correct option from the given codes.

Test: Energy Flow (NCERT) - Question 14

In an aquatic ecosystem, the organism present at the trophic level equivalent to cows in grasslands is?

Detailed Solution for Test: Energy Flow (NCERT) - Question 14

In an aquatic ecosystem, the important herbivores are zooplankton, larvae, tadpoles, etc. Cows in grasslands also act as herbivores as these feed on producers. Thus, both cows and zooplankton occupy second trophic level in terrestrial and aquatic ecosystem respectively.

Test: Energy Flow (NCERT) - Question 15

Read the given statements and select the correct option.
Statement 1: Herbivores are also called as first-order consumers.
Statement 2: Herbivores obtain their food directly from plants.

Detailed Solution for Test: Energy Flow (NCERT) - Question 15

First-order consumers are animals that eat plants called herbivores. They are the first step in the food chain.

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