SELECT * FROM question_mgmt as q WHERE id=505 AND status=1 SELECT id,question_no,question,chapter FROM question_mgmt as q WHERE courseId=3 AND subId=7 AND chapterId=39 and ex_no='1' AND status=1 ORDER BY CAST(question_no AS UNSIGNED) CBSE Free NCERT Solution of 12th biology Ecosystem distinguish between a grazing food chain and det

Question: Distinguish between
(a) Grazing food chain and detritus food chain
(b) Production and decomposition
(c) Upright and inverted pyramid
(d) Food chain and Food web
(e) Litter and detritus
(f) Primary and secondary productivity

Answer:

 (a) Grazing food chain and detritus food chain

 

Grazing food chain

 

Detritus food chain

1.

In this food chain, energy is derived from the Sun.

1.

In this food chain, energy comes from organic matter (or detritus) generated in trophic levels of the grazing food chain.

2.

It begins with producers, present at the first trophic level. The plant biomass is then eaten by herbivores, which in turn are consumed by a variety of carnivores.

2.

It begins with detritus such as dead bodies of animals or fallen leaves, which are then eaten by decomposers or detritivores. These detritivores are in turn consumed by their predators.

3.

This food chain is usually large.

3.

It is usually smaller as compared to the grazing food chain.

(b) Production and decomposition

 

Production

 

Decomposition

1.

It is the rate of producing organic matter (food) by producers.

2.

It is the process of breaking down of complex organic matter or biomass from the body of dead plants and animals with the help of decomposers into organic raw material such as CO2, H2O, and other nutrients.

2.

It depends on the photosynthetic capacity of the producers.

2.

It occurs with the help of decomposers.

3

Sunlight is required by plants for primary production.

3.

Sunlight is not required for decomposition by decomposers

(c) Upright and inverted pyramid

 

Upright pyramid

 

Inverted pyramid

1.

The pyramid of energy is always upright.

1.

The pyramid of biomass and the pyramid of numbers can be inverted.

2.

In the upright pyramid, the number and biomass of organisms in the producer level of an ecosystem is the highest, which keeps on decreasing at each trophic level in a food chain.

2.

In an inverted pyramid, the number and biomass of organisms in the producer level of an ecosystem is the lowest, which keeps on increasing at each tropic level.

(d) Food chain and Food web

 

Food chain

 

Food web

1.

It is a single linear sequence of organisms.

1.

It contains a number of interconnected food chains.

2.

Members present at higher trophic levels feed on single types of organisms.

2.

One organism has alternate food sources.

(e) Litter and detritus

 

Litter

 

Detritus

1.

Litter contains all kinds of wastes generated above the ground.

1.

Detritus is composed of the remains of dead plants and animals.

2.

Litter contains both biodegradable and non-biodegradable matter.

2.

Detritus contains only biodegradable matter.

(f) Primary and secondary productivity

 

Primary productivity

 

Secondary productivity

1.

It is defined as the amount of organic matter produced by producers per unit area over a period of time.

1.

It is defined as the rate of production of organic matter by consumers over a period of time.

 


< Previous Question

Next Question >

SELECT ex_no,question,question_no,id,chapter FROM question_mgmt as q WHERE courseId='3' AND subId='7' AND ex_no!=0 AND status=1 and id!=505 ORDER BY views desc, last_viewed_on desc limit 0,10

  • Popular questions of class 12 Biology

SELECT ex_no,question,question_no,id,chapter FROM question_mgmt as q WHERE courseId='3' AND subId='7' AND ex_no!=0 AND status=1 and id!=505 ORDER BY last_viewed_on desc limit 0,10

  • Recently Viewed Questions of Class 12 Biology

Comments

  • Answered by Ekta Mehta
  • 4 months ago

Taking Screenshots on your Samsung Galaxy M31s is very easy and quick.

  • Answered by Ekta Mehta
  • 4 months ago

Taking Screenshots on your Samsung Galaxy M31s is very easy and quick.

  • Answered by Ekta Mehta
  • 4 months ago

Taking Screenshots on your Samsung Galaxy M31s is very easy and quick.

Comment(s) on this Question


NCERT Solutions

Quick Links

Resources

Support