ISC (Science) ISC Class 12 - CISCE Important Questions for Biology (Theory)

Mention the scientific name of protozoan parasite that causes Amoebiasis.

The diagram given below shows the life cycle of a malarial parasite. Study it carefully and answer the questions that follows:

1. Name the hosts in which the asexual phase and sexual phase of the life cycle takes place.
2. Identify the infective stage labelled ‘D’.
3. Name the structure labelled ‘A’ and ‘E’.
4. Give any one symptom of malaria.

Some orchids live on the branches of mango trees. Name the type of interaction that exists between the mango tree and the orchid.

What happens to an inferior competitor if a superior competitor is present in the same environment?

What happens to an inferior competitor if the superior competitor is removed from the environment?

Which organisms constitute the last trophic level?

Answer the following question:

Why do Green plants start evolving CO₂ instead of O₂, at high temperatures?

With reference to the levels of an organisation, differentiate between living organisms and non-living objects.

Based on the table given below, identify the type of natural selection taking place.

Given below are the features of Seed A and Seed B. Study them carefully and answer the question that follows.

Identify the type of Seed A and Seed B. Cite one example of each of Seed A and Seed B.

1. With respect to this ecosystem, draw a pyramid for each biomass and a pyramid of number.

2. If 20,000 Kcal energy is available at the level of insects, calculate the amount of energy available at the level of big-sized birds.

Give one significant contribution of the given scientist

E. Wilson

Define Hotspots.

Define Ramsar Sites.

Define Biodiversity.

Define Eutrophication.

Explain the chemiosmotic hypothesis for ATP synthesis.

Study the graph given below and answer the following questions:

1. Explain the ecological principle represented by the graph and write a mathematical expression for the same.
2. What will happen if the slope of the line ‘b’ becomes steeper?

The table given below shows the Area, Y-intercept and regression coefficient of the continents namely, Africa and Europe. Study the table carefully and answer the questions that follow:

1. Calculate the species richness (S) of each continent.
2. Which of these continents shows a higher biodiversity?
3. State any two factors that cause an increase in biodiversity.

Name any two factors responsible for the loss of biodiversity in a geographical region.