Molecular Basis of Inheritance — BIOLOGY STD 12 Science — Question

If a population growing exponentially double in size in 3 yours, what is the intrinsic rate of increase (r) of the population?

Name some traditional Indian foods made of wheat, rice and Bengal gram (or their products) which involve use of microbes.

Explain how oxygen and the chemical composition of detritus control decomposition.

The following graph shows the species-area relationship. Answer the following question as directed.

1. Name the naturalist who studied the kind of relationship shown in the graph. Write the observation made by him.
2. Write the situations as discovered by the ecologists when the value of 'Z' (slope of the line) lies.

1. 0.1 and 0.2
2. 0.6 and 1.2

What does 'Z' stand for?

3. When would the slope of the line 'b' become steeper?

Write the three basic facts that are highlighted in Mendel's Law of Dominance.

Write a short note on
Behavioural adaptations in animals

A large number of married couples the world over are childless. It is shocking to know that in India the female partner is often blamed for the couple being childless.
Why in your opinion the female partner is often blamed for such situations in India?

Seeing a crowd of students in one corner of the school, the principal rushed to see the matter and found some children beating and chasing a small lizard. On seeing the principal, all the children fled to their classes except Alok who requested the principal to arrange for some medical assistance for the injured animal. The principal rewarded Alok for his attitude to save guard our biodiversity.

1. Mention the factors resulting in loss of biodiversity
2. Was Alok an indisciplined boy, who did not run to the class on seeing the principal? What values does the act promote?

For the expression of traits genes provide only the potentiality and the environment provides the opportunity. Comment on the veracity of the statement.

Identify the figure given and the part labelled “A”.