List of top Questions asked in CBSE CLASS XII

Write important features of a sedimentary cycle in an ecosystem.

Integrate the function: \(\frac{xe^x}{(1+x)^2}\)

Give an account of energy flow in an ecosystem.

Integrate the function: \(e^x(sinx+cosx)\)

Integrate the function: \((x^2+1)logx\)

Integrate the function: \(x(logx)^2\)

Integrate the function: \(xsec^2x\)

Define decomposition and describe the processes and products of decomposition.

What is primary productivity? Give brief description of factors that affect primary productivity.

Integrate the function: \(\frac{xcos^{-1}x}{\sqrt{1-x^2}}\)

Describe the components of an ecosystem.

Integrate the function: \((sin^{-1}x)^2\)

Integrate the function: \(xcos^{-1} x\)

Integrate the function: \(xtan^{-1}x\)

Integrate the function: \(xsin^{-1}x\)

Integrate the function: \(x^2 log\ x\)

Integrate the function: \(x log \ 2x\)

Integrate the function: x logx

Integrate the function: \(x^2e^x\)

Integrate the function: \(xsin\  3x\)

Integrate the function: \(x sin \ x\)

What is the percentage of photosynthetically active relation(PAR) in the incident solar radiation.
(a)100%
(b)50%
(c)1-5%
(d)2-10%

Secondary producers are
(a) Herbivores
(b) Producers
(c) Carnivores
(d) None of the above

The second trophic level in a lake is-
(a) Phytoplankton
(b) Zooplankton
(c) Benthos
(d) Fishes

Which one of the following has the largest population in a food chain?
(a) Producers
(b) Primary consumers
(c) Secondary consumers
(d) Decomposers