Ecosystem

Each subtopic includes About section, revision page link, 10 preview questions, and practice CTAs.

Ecosystem Structure and Function

Subtopic

Ecosystem Structure and Function under Ecosystem for Grade 12 CBSE.

About Topic & Revision

Preview questions (no answers)

1.
$An ecosystem consists of:$
A. $Only biotic components$
B. $Only abiotic components$
C. $Both biotic and abiotic components$
D. $Only producers$
2.
$The rate of formation of new organic matter by consumers is called:$
A. $Net primary productivity$
B. $Gross primary productivity$
C. $Secondary productivity$
D. $Net community productivity$
3.
$Standing state refers to the amount of ________ in the soil at a given time.$
A. $Biomass$
B. $Inorganic nutrients$
C. $Living organisms$
D. $Energy$

Download the worksheet for Ecosystem - Ecosystem Structure and Function to practice offline. It includes additional chapter-level practice questions.

Productivity and Decomposition

Subtopic

Productivity and Decomposition under Ecosystem for Grade 12 CBSE.

About Topic & Revision

Preview questions (no answers)

1.
$Humus is colloidal in nature and because of this, it:$
A. $Speeds up catabolism$
B. $Acts as a reservoir of nutrients$
C. $Makes the soil acidic$
D. $Is easily washed away by rain$
2.
$Which of the following is NOT a step in the process of decomposition?$
A. $Fragmentation$
B. $Humification$
C. $Photosynthesis$
D. $Catabolism$
3.
$In the context of the carbon cycle and ecosystem functioning, decomposition acts as a:$
A. $Nutrient sink$
B. $Release mechanism for nutrients$
C. $Barrier to nutrient flow$
D. $Producer of energy$

Download the worksheet for Ecosystem - Productivity and Decomposition to practice offline. It includes additional chapter-level practice questions.

Energy Flow and Food Chains

Subtopic

Energy Flow and Food Chains under Ecosystem for Grade 12 CBSE.

About Topic & Revision

Preview questions (no answers)

1.
$Which of the following organisms is a detritivore?$
A. $Lion$
B. $Earthworm$
C. $Eagle$
D. $Rabbit$
2.
$The movement of energy through various trophic levels is always unidirectional because:$
A. $Energy lost as heat cannot be reused by plants$
B. $Carnivores eat producers directly$
C. $Sunlight is available only during the day$
D. $Decomposers return energy to the sun$
3.
$In a pond ecosystem, what is the role of phytoplankton?$
A. $Decomposers$
B. $Primary consumers$
C. $Secondary consumers$
D. $Producers$

Download the worksheet for Ecosystem - Energy Flow and Food Chains to practice offline. It includes additional chapter-level practice questions.

Ecological Pyramids

Subtopic

Ecological Pyramids under Ecosystem for Grade 12 CBSE.

About Topic & Revision

Preview questions (no answers)

1.
$In an inverted pyramid of biomass, the producers are usually:$
A. $Very large trees$
B. $Small phytoplankton with high turnover rates$
C. $Large mammals$
D. $Small shrubs$
2.
$What is the primary source of energy for the first trophic level in most ecological pyramids?$
A. $Chemical energy$
B. $Solar energy$
C. $Geothermal energy$
D. $Mechanical energy$
3.
$Which of the following is NOT a level in an ecological pyramid?$
A. $Producers$
B. $Secondary consumers$
C. $Primary consumers$
D. $Secondary producers$

Download the worksheet for Ecosystem - Ecological Pyramids to practice offline. It includes additional chapter-level practice questions.