List of top Questions asked in CBSE CLASS XII

Write a short note on
(a) Adaptations of desert plants and animals
(b) Adaptations of plants to water scarcity
(c) Behavioural adaptations in animals
(d) Importance of light to plants
(e) Effect of temperature or water scarcity and the adaptations of animals.

What is the ecological principle behind the biological control method of managing with pest insects?
An orchid plant is growing on the branch of mango tree. How do you describe this interaction between the orchid and the mango tree?
Name important defence mechanisms in plants against herbivory.
If a population growing exponentially double in size in 3 years what is the intrinsic rate of increase (r) of the population?
Integrate the rational function: \(\frac {1}{(e^x-1) }\)
Integrate the rational function: \(\frac {1}{x(x^4-1)}\)
Integrate the rational function: \(\frac {2x}{(x^2+1)(x^2+3)}\)
Integrate the rational function: \(\frac {(x^2+1)(x^2+2)}{(x^2+3)(x^2+4)}\)
Most living organisms cannot survive at temperature above 45°C°. How are some microbes able to live in habitats with temperatures exceeding 100°C?
Integrate the rational function: \(\frac {cos \ x}{(1-sin\ x)(2-sin\ x)}\)
Define phenotypic adaptation. Give one example.
Integrate the rational function: \(\frac {1}{x(x^n+1)}\)
If a marine fish is placed in a fresh water aquarium will the fish be able to survive? Why or why not?
How is diapause different from hibernation?
Integrate the rational function: \(\frac {1}{x^4-1}\)
Integrate the rational function: \(\frac {3x-1}{(x+2)^2}\)
Integrate the rational function: \(\frac {2}{(1-x)(1+x^2)}\)
Integrate the rational function: \(\frac {x^3+x+1}{x^2-1}\)
How do biofertilisers enrich the fertility of the soil?
Integrate the rational function: \(\frac {5x}{(x+1)(x^2-4)}\)
Arrange the following in the decreasing order (most important first) of their importance, for the welfare of human society. Give reasons for your answer. Biogas, Citric acid, Penicillin and Curd
Integrate the rational function: \(\frac{2x-3}{(x^2-1)(2x+3)}\)
Integrate the rational function: \(\frac{3x+5}{x^3-x^2-x+1}\)

Find out the role of microbes in the following and discuss it with your teacher.

(a) Single cell protein(SCP)
(b) Soil