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.
$CO_2$
A. $Decomposition$
B. $Humification$
C. $Mineralization$
D. $Fragmentation$
2.
$Dead plant remains such as leaves, bark, flowers, and dead remains of animals, including fecal matter, constitute:$
A. $Humus$
B. $Litter$
C. $Inorganic matter$
D. $Detritus$
3.
$The rate of biomass production is called productivity. Which of the following represents the rate at which organic matter is created by producers during photosynthesis?$
A. $Net Primary Productivity$
B. $Secondary Productivity$
C. $Gross Primary Productivity$
D. $Tertiary Productivity$

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.
$Which of the following is the primary starting material for the process of decomposition?$
A. $Inorganic minerals$
B. $Solar energy$
C. $Detritus$
D. $Atmospheric nitrogen$
2.
$Secondary productivity is defined as the rate of formation of new organic matter by:$
A. $Producers$
B. $Consumers$
C. $Decomposers$
D. $Parasites$
3.
$The process where water-soluble inorganic nutrients go down into the soil horizon and get precipitated as unavailable salts is known as:$
A. $Fragmentation$
B. $Catabolism$
C. $Humification$
D. $Leaching$

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.
$According to Lindeman's law, only 10% of energy is transferred to the next trophic level. In what form is the remaining 90% of energy primarily lost?$
A. $Excretion only$
B. $Heat during respiration and other activities$
C. $Decomposition$
D. $Storage in tissues$
2.
$Which type of ecological pyramid is never inverted in a stable ecosystem?$
A. $Pyramid of Energy$
B. $Pyramid of Biomass$
C. $Pyramid of Numbers$
D. $Pyramid of Species Diversity$
3.
$The Detritus Food Chain (DFC) begins with which of the following?$
A. $Solar radiation$
B. $Green plants$
C. $Dead organic matter$
D. $Primary consumers$

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.
$Which of the following ecological pyramids can never be inverted?$
A. $Pyramid of Numbers$
B. $Pyramid of Biomass$
C. $Pyramid of Energy$
D. $Both A and B$
2.
$T_{1}$
A. $Snake$
B. $Frog$
C. $Grasshopper$
D. $Grass$
3.
$The Pyramid of Energy is always upright in any functional ecosystem. This is primarily because:$
A. $Energy is lost as heat at each trophic transfer according to the Second Law of Thermodynamics$
B. $Producers are always larger in size than consumers$
C. $Carnivores have a more efficient digestive system than herbivores$
D. $Decomposers provide additional energy to the producers$

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

Ecosystem - CBSE Class 12 Biology Notes & Revision | Krit.club