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

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Biology
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Give functions of synthetic auxin 2,4-D.

[7] Plant Growth and Mineral Nutrition
Chapter: [7] Plant Growth and Mineral Nutrition
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Which bacteria transform acetic acid into biogas?

[7] Plant Growth and Mineral Nutrition
Chapter: [7] Plant Growth and Mineral Nutrition
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Write full form of IBA

[7] Plant Growth and Mineral Nutrition
Chapter: [7] Plant Growth and Mineral Nutrition
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Write full form of NAA

[7] Plant Growth and Mineral Nutrition
Chapter: [7] Plant Growth and Mineral Nutrition
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Name the following:

Transgenic fish.

[11] Enhancement of Food Production
Chapter: [11] Enhancement of Food Production
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Give reasons: 2,4-D is used as herbicide.

[7] Plant Growth and Mineral Nutrition
Chapter: [7] Plant Growth and Mineral Nutrition
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What are the different types of chromosomal aberrations?

[5] Origin and Evolution of Life
Chapter: [5] Origin and Evolution of Life
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Which of the following hormone is responsible for apical dominance?

[7] Plant Growth and Mineral Nutrition
Chapter: [7] Plant Growth and Mineral Nutrition
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With neat labelled diagram describe pathways for water uptake by root.

[6] Plant Water Relation
Chapter: [6] Plant Water Relation
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Identify and define ‘A' and ‘B’ in relation to uptake of water by the root:

[6] Plant Water Relation
Chapter: [6] Plant Water Relation
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Which one of the following does not evolve further?

[14] Ecosystems and Energy Flow
Chapter: [14] Ecosystems and Energy Flow
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What is a test cross?

[3] Inheritance and Variation
Chapter: [3] Inheritance and Variation
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Give any ‘two’ factors responsible for genetic variation.

[5] Origin and Evolution of Life
Chapter: [5] Origin and Evolution of Life
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Mention any 'two' ecological services forthe benefit of mankind

[14] Ecosystems and Energy Flow
Chapter: [14] Ecosystems and Energy Flow
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Define vegetative propagation.

[1] Reproduction in Lower and Higher Plants
Chapter: [1] Reproduction in Lower and Higher Plants
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Explain with tile help of a chart, explain the compatibility of human blood groups.

[8] Respiration and Circulation
Chapter: [8] Respiration and Circulation
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Explain the significance of a test cross.

[3] Inheritance and Variation
Chapter: [3] Inheritance and Variation
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Explain ABO  blood group system in human being with a suitable chart.

[8] Respiration and Circulation
Chapter: [8] Respiration and Circulation
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Overproduction is the principle of

(A) Lamarckism

(B) Theory of organic evolution

(C) Panspermia theory

(D) Modern theory of evolution

[5] Origin and Evolution of Life
Chapter: [5] Origin and Evolution of Life
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Why only left ovary and oviduct arc present in birds?

[5] Origin and Evolution of Life
Chapter: [5] Origin and Evolution of Life
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