PUC Science 2nd PUC Class 12 - Karnataka Board PUC Question Bank Solutions for Biology

List the three states the annuals and biennial angiosperms have to pass through during their life cycle.

By taking two examples explain how has bio-fortification helped in improving food quality.

In a flowering plant a microspore mother cell produces four male gametophytes while a megapore mother cell forms only one female gametophyte. Explain

Read the statement and answer the questions that follow.

A flower of brinjal has 520 ovules in its ovary. However, it produces a fruit with only 480 viable seeds.

(a) What could have prevented the rest of the 40 ovules from maturing into viable seeds? Explain giving a reason.

(b) Describe the development of a dicot embryo in a viable seed.

(c) Why certain angiospermic seed albuminous while others are exalbuminous? Explain.

A capsicum flower has 240 ovules in its ovary. But, it produces a fruit with only 180 viable seeds.
 

Bottled fruit juices are clearer as compared to those made at home. Explain.

What is inbreeding depression?

Explain the importance of "selection" during inbreeding in cattle

Explain the role of Restriction endonuclease in Biotechnology

Explain the role of the Gel − electrophoresis in Biotechnology

Explain the role of the Selectable markers in pBR322 in Biotechnology.

Show with the help of a flow chart only, the life cycle of malarial parasite in humans.

How does a desert plant adapt to the dry, warmer environmental conditions ?

One of the major contributions of biotechnology is to develop pest-resistant varieties of cotton plants. Explain how it has been made possible.

How can sewage be used to generate biogas ? Explain.

Name and explain the technique used for separating DNA fragments and making them available for biotechnology experiments.

Which particles are responsible for causing the greatest harm to human health?

What is mycoherbicide?

Differentiate the following and give examples of Active and passive immunity

Suggest a method to ensure an anamnestic response in humans.