Science (English Medium) Class 12 - CBSE Question Bank Solutions for Biology

Observe the set of 4 figures A, B, C and D and, answer the following questions

1. Which one of the figures shows mutualism?
2. What kind of association is shown in D?
3. Name the organisms and the association in C.
4. What role is the insect performing in B?

Fig. (A)	Fig. (B)
Fig. (C)	Fig. (D)

Discuss the various types of positive interactions between species.

In an aquarium two herbivorous species of fish are living together and feeding on phytoplanktons. As per the Gause’s Principle, one of the species is to be eliminated in due course of time, but both are surviving well in the aquarium. Give possible reasons.

While living in and on the host species, the animal parasite has evolved certain adaptations. Describe these adaptations with examples.

Give one example for the following:

A parasitic angiosperm

Give one example for the following:

An organism which can conform

What is common to the techniques (i) in vitro fertilisation, (ii) Cryo preservation and (iii) tissue culture?

Define the terms bioprospecting

Define the terms endemism

How is the presently occurring species extinction different from the earlier mass extinctions?

Humans benefit from diversity of life. Give two examples.

What is an endangered species? Give an example of an endangered plant and animal species each?

What are sacred groves and their role in biodiversity conservation?

What is an ecosystem service? List any four important ecosystem services provided by the natural ecosystems. Are you in favour or against levying a charge on the service provided by the ecosystem?

Describe the consumptive use value of biodiversity as food, drugs and medicines, fuel and fiber with suitable examples.

Sea Anemone gets attached to the surface of the hermit crab. The kind of population interaction exhibited in this case is ______.

Which of the following is an example of ex-situ conservation?

Write the observations made at the end of Connell's field, experiment on barnacles on the rocky sea coasts of Scotland.

Name any two categories of organisms that in general are adversely affected by competition.

Many members of genus Glomus form a mycorrhizal association with plants. Elaborate how is this association beneficial to the plants.