HSC Science (General) 12th Standard Board Exam - Maharashtra State Board Question Bank Solutions for Biology

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Biology
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Why aquatic animals can afford to be ammonotelic?

[10.02] Excretion and Osmoregulation
Chapter: [10.02] Excretion and Osmoregulation
Concept: Modes of Excretion: Ammonotelism, Ureotelism, and Uricotelism

What is Red Data Book?

[0.15] Biodiversity, Conservation and Environmental Issues
Chapter: [0.15] Biodiversity, Conservation and Environmental Issues
Concept: Biodiversity

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Name the enzyme and state its property that is responsible for continuous and discontinuous replication of the two strands of a DNA molecule

[0.04] Molecular Basis of Inheritance
Chapter: [0.04] Molecular Basis of Inheritance
Concept: Deoxyribonucleic Acid (DNA) and Its Structure

Define the following term and give one example:

Parasitism

[0.14] Ecosystems and Energy Flow
Chapter: [0.14] Ecosystems and Energy Flow
Concept: Ecosystem

Which of the following is a chemical transmitter in the synapse of neurons?

[0.09] Control and Co-ordination
Chapter: [0.09] Control and Co-ordination
Concept: Control and Co-ordination

Vermiform appendix is an example of __________ organ.

(A) vestigeal

(B) homologous

(C) sense

(D) analogous

[0.05] Origin and Evolution of Life
Chapter: [0.05] Origin and Evolution of Life
Concept: Origin and Evolution of Universe and Earth

The phenomenon of industrial melanism demonstrates__________

(a) natural selection

(b) induced mutations

(c) reproductive isolation

(d) geographical isolation

[0.05] Origin and Evolution of Life
Chapter: [0.05] Origin and Evolution of Life
Concept: Origin and Evolution of Universe and Earth

Define Eutrophication.

[0.15] Biodiversity, Conservation and Environmental Issues
Chapter: [0.15] Biodiversity, Conservation and Environmental Issues
Concept: Biodiversity

Define an ecosystem.

[0.14] Ecosystems and Energy Flow
Chapter: [0.14] Ecosystems and Energy Flow
Concept: Ecosystem

By which process ammonia is converted into urea in liver?

[10.02] Excretion and Osmoregulation
Chapter: [10.02] Excretion and Osmoregulation
Concept: Modes of Excretion: Ammonotelism, Ureotelism, and Uricotelism

Select and write the most appropriate answer from the given.

Identify the type of isolation where the members of two populations have different mating behaviour which prevents interbreeding: 

[0.05] Origin and Evolution of Life
Chapter: [0.05] Origin and Evolution of Life
Concept: Origin and Evolution of Universe and Earth

Select and write the most appropriate answer from the given. 
Which stage in the life cycle of silk moth secretes silk? 

[0.05] Origin and Evolution of Life
Chapter: [0.05] Origin and Evolution of Life
Concept: Origin and Evolution of Universe and Earth

Multiple choice question.

Insect pollinated flowers usually posses ______

[0.01] Reproduction in Lower and Higher Plants
Chapter: [0.01] Reproduction in Lower and Higher Plants
Concept: Reproduction in Plant

Multiple choice question.

In ovule, meiosis occurs in ______

[0.01] Reproduction in Lower and Higher Plants
Chapter: [0.01] Reproduction in Lower and Higher Plants
Concept: Reproduction in Plant

Multiple choice question.

The ploidy level is not the same in ______.

[0.01] Reproduction in Lower and Higher Plants
Chapter: [0.01] Reproduction in Lower and Higher Plants
Concept: Reproduction in Plant

Which of the following types require pollinator but the result is genetically similar to autogamy?

[0.01] Reproduction in Lower and Higher Plants
Chapter: [0.01] Reproduction in Lower and Higher Plants
Concept: Reproduction in Plant

If diploid chromosome number in a flowering plant is 12, then which one of the following will have 6 chromosomes?

[0.01] Reproduction in Lower and Higher Plants
Chapter: [0.01] Reproduction in Lower and Higher Plants
Concept: Reproduction in Plant

Multiple choice question.

In angiosperms, endosperm is formed by/ due to ______

[0.01] Reproduction in Lower and Higher Plants
Chapter: [0.01] Reproduction in Lower and Higher Plants
Concept: Reproduction in Plant

Multiple choice question.

Point out the odd one.

[0.01] Reproduction in Lower and Higher Plants
Chapter: [0.01] Reproduction in Lower and Higher Plants
Concept: Reproduction in Plant

The number of nuclei present in a zygote is _______.

[0.02] Reproduction in Lower and Higher Animals
Chapter: [0.02] Reproduction in Lower and Higher Animals
Concept: Reproduction in Animal and Human
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