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Question Bank Solutions for CBSE (Science) Class 12 - CBSE

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Name the parts of an angiosperm flower in which development of male and female gametophyte take place

[0.02] Sexual Reproduction in Flowering Plants
Chapter: [0.02] Sexual Reproduction in Flowering Plants
Concept: Flower - a Fascinating Organ of Angiosperms

What are the various public health measures, which you would suggest as safeguard against infectious diseases?

[0.01] Human Health and Diseases
Chapter: [0.01] Human Health and Diseases
Concept: Introduction of Human Health and Diseases

In which way has the study of biology helped us to control infectious diseases?

[0.01] Human Health and Diseases
Chapter: [0.01] Human Health and Diseases
Concept: Introduction of Human Health and Diseases

How does the transmission of each of the following diseases take place?

(a) Amoebiasis

(b) Malaria

(c) Ascariasis

(d) Pneumonia

[0.01] Human Health and Diseases
Chapter: [0.01] Human Health and Diseases
Concept: Introduction of Human Health and Diseases

The following are some well-known abbreviations, which have been used in this chapter. Expand each one to its full form:

(a) MALT

(b) CMI

(c) AIDS

(d) NACO

(e) HIV

[0.01] Human Health and Diseases
Chapter: [0.01] Human Health and Diseases
Concept: Introduction of Human Health and Diseases

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

[0.02] Sexual Reproduction in Flowering Plants
Chapter: [0.02] Sexual Reproduction in Flowering Plants
Concept: Flower - a Fascinating Organ of Angiosperms

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

[0.02] Strategies for Enhancement in Food Production
Chapter: [0.02] Strategies for Enhancement in Food Production
Concept: Introduction of Strategies for Enhancement in Food Production

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

[0.02] Sexual Reproduction in Flowering Plants
Chapter: [0.02] Sexual Reproduction in Flowering Plants
Concept: Flower - a Fascinating Organ of Angiosperms

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.

[0.02] Sexual Reproduction in Flowering Plants
Chapter: [0.02] Sexual Reproduction in Flowering Plants
Concept: Flower - a Fascinating Organ of Angiosperms

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

Explain giving a reason that could be responsible for such a result.
[0.02] Sexual Reproduction in Flowering Plants
Chapter: [0.02] Sexual Reproduction in Flowering Plants
Concept: Flower - a Fascinating Organ of Angiosperms

Name the following:  Any one inter-specific hybrid mammal.

[0.02] Strategies for Enhancement in Food Production
Chapter: [0.02] Strategies for Enhancement in Food Production
Concept: Introduction of Strategies for Enhancement in Food Production

Give an example of an angiosperm seed that has a perisperm. Name the part the perisperm develops from.

[0.02] Sexual Reproduction in Flowering Plants
Chapter: [0.02] Sexual Reproduction in Flowering Plants
Concept: Flower - a Fascinating Organ of Angiosperms

Explain the events upto double fertilisation after the pollen tube enters one of the synergids in an ovule of an angiosperm.
 

[0.02] Sexual Reproduction in Flowering Plants
Chapter: [0.02] Sexual Reproduction in Flowering Plants
Concept: Flower - a Fascinating Organ of Angiosperms

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

 

 
[0.02] Strategies for Enhancement in Food Production
Chapter: [0.02] Strategies for Enhancement in Food Production
Concept: Introduction of Strategies for Enhancement in Food Production

A typical flower has ______ different kinds of whorl.

[0.02] Sexual Reproduction in Flowering Plants
Chapter: [0.02] Sexual Reproduction in Flowering Plants
Concept: Flower - a Fascinating Organ of Angiosperms

Science of cultivation, breeding, marketing and arrangement of flowers is called ______.

[0.02] Sexual Reproduction in Flowering Plants
Chapter: [0.02] Sexual Reproduction in Flowering Plants
Concept: Flower - a Fascinating Organ of Angiosperms

Fragrant flowers with well developed nectaries are an adaptation for ______.

[0.02] Sexual Reproduction in Flowering Plants
Chapter: [0.02] Sexual Reproduction in Flowering Plants
Concept: Flower - a Fascinating Organ of Angiosperms

The flower is the site of ______.

[0.02] Sexual Reproduction in Flowering Plants
Chapter: [0.02] Sexual Reproduction in Flowering Plants
Concept: Flower - a Fascinating Organ of Angiosperms

Pollen grains are well preserved as fossils because of the presence of ______

[0.02] Sexual Reproduction in Flowering Plants
Chapter: [0.02] Sexual Reproduction in Flowering Plants
Concept: Flower - a Fascinating Organ of Angiosperms

In a fertilized ovule, n, 2n, and 3n conditions occur respectively in ______

[0.02] Sexual Reproduction in Flowering Plants
Chapter: [0.02] Sexual Reproduction in Flowering Plants
Concept: Flower - a Fascinating Organ of Angiosperms
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