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

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Mention any three characteristics of Neanderthal man that lived in near east and central Asia.

Appears in 4 question papers
Chapter: [2.03] Evolution
Concept: Origin and Evolution of Man

Draw a labeled diagram of a mature embryo sac.

Appears in 3 question papers
Chapter: [1.03] Human Reproduction
Concept: Embryo Development Upto Blastocyst Formation

State any three goals of the human genome project

Appears in 3 question papers
Chapter: [2.02] Molecular Basis of Inheritance
Concept: Human Genome Project

Name the causative organism and preventive measures for Typhoid

Appears in 3 question papers
Chapter: [3.01] Human Health and Diseases
Concept: Infectious and Non Infectious Disease

Define Parthenocarpy

Appears in 2 question papers
Chapter: [1.02] Sexual Reproduction in Flowering Plants
Concept: Significance of Seed Dispersal and Fruit Formation

What is spermatogenesis? Briefly describe the process of spermatogenesis.

Appears in 2 question papers
Chapter: [1.03] Human Reproduction
Concept: Gametogenesis

What is emasculation?

Appears in 2 question papers
Chapter: [3.02] Strategies for Enhancement in Food Production
Concept: Plant Breeding

What is a 'biopatent'? Explain it with a suitable example.

Appears in 2 question papers
Chapter: [4.02] Biotechnology and Its Applications
Concept: Ethical Issues

What is Red Data Book?

Appears in 2 question papers
Chapter: [5.03] Biodiversity and Its Conservation
Concept: Red Data Book

Why is non-cyclic photo phosphorylation considered as a non-cyclic pathway?

Appears in 1 question paper
Chapter: [1.02] Sexual Reproduction in Flowering Plants
Concept: Introduction of Sexual Reproduction in Flowering Plants

Triple Fusion involves:
(i) Fusion of one male, gamete with female gamete
(ii) Fusion of tube nucleus with generative nvcleus
(iii) Fusion of two polar nuclei.
(iv) Fusion of second male gamete with two polar nuclei

Appears in 1 question paper
Chapter: [1.02] Sexual Reproduction in Flowering Plants
Concept: Double Fertilisation

With the help of diagrams, name and describe the different types of placentation seen in angiosperms.

Appears in 1 question paper
Chapter: [1.02] Sexual Reproduction in Flowering Plants
Concept: Introduction of Sexual Reproduction in Flowering Plants

Define Racemose inflorescence

Appears in 1 question paper
Chapter: [1.02] Sexual Reproduction in Flowering Plants
Concept: Flower – a Fascinating Organ of Angiosperms

Give reasons for the following:

Secondary growth does not occur in monocot stems.

Appears in 1 question paper
Chapter: [1.02] Sexual Reproduction in Flowering Plants
Concept: Pre-fertilisation - Structures and Events > Stamen, Microsporangium and Pollen Grain

Describe the different types of vascular bundles.

Appears in 1 question paper
Chapter: [1.02] Sexual Reproduction in Flowering Plants
Concept: Pre-fertilisation - Structures and Events > Stamen, Microsporangium and Pollen Grain

If the haploid number of chromosomes in a plant species is 20, how many chromosomes will be
present in the cells of the shoot tip?

Appears in 1 question paper
Chapter: [1.02] Sexual Reproduction in Flowering Plants
Concept: Introduction of Sexual Reproduction in Flowering Plants

Name a plant which flowers every twelve years.

Appears in 1 question paper
Chapter: [1.02] Sexual Reproduction in Flowering Plants
Concept: Flower – a Fascinating Organ of Angiosperms

Name the terminal stage of ageing in the life cycle of plants

Appears in 1 question paper
Chapter: [1.02] Sexual Reproduction in Flowering Plants
Concept: Flower – a Fascinating Organ of Angiosperms

Give a reason for the Following:

Pollen grains of wind-pollinated flowers are produced in large quantities.

Appears in 1 question paper
Chapter: [1.02] Sexual Reproduction in Flowering Plants
Concept: Flower – a Fascinating Organ of Angiosperms

Abortion in the first trimester of pregnancy may occur due to lack of___________

(a) aldosterone
(b) testosterone
(c) oestrogen
(d) progesterone

Appears in 1 question paper
Chapter: [1.03] Human Reproduction
Concept: Parturition and Lactation
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