HSC Science कक्षा १२ - Tamil Nadu Board of Secondary Education Question Bank Solutions

Give an account of the role of Jasminum and Rosa in perfuming.

Write the economic importance of rice.

Which of the following sentences are correct?

1. The offspring exhibit only parental combinations due to incomplete linkage
2. The linked genes exhibit some crossing over incomplete linkage
3. The separation of two linked genes is possible in incomplete linkage
4. Crossing over is absent in complete linkage

Due to incomplete linkage in maize, the ratio of parental and recombinants are

A eukaryotic gene contains two kinds of base sequences which of these plays an important role in protein synthesis?

When two different genes came from the same parent they tend to remain together.

What is the name of this phenomenon?

Arrange the correct sequence of ecological hierarchy starting from lower to a higher level.

Pedogenesis refers to

Mycorrhiza promotes plant growth by

Which of the following plant has non-succulent xerophytic and thick leathery leaves with a waxy coating

What is Phytoremediation?

What is Albedo effect and write their effects?

Lichen is considered a good example of obligate mutualism. Explain.

What is mutualism? Mention any two examples where the organisms involved are commercially exploited in modern agriculture.

List any two adaptive features evolved in parasites enabling them to live successfully on their host?

Mention any two significant roles of predation plays in nature.

How does an orchid Ophrys ensure its pollination by bees?

Water is very essential for life. Write any three features for plants that enable them to survive in a water-scarce environment.

Why do submerged plants receive weak illumination than exposed floating plants in a lake?

What is vivipary? Name a plant group that exhibits vivipary.