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HSC Science (General) इयत्ता १२ वी - Maharashtra State Board Question Bank Solutions

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Match the column A with B and rewrite correct pairs.

  A B
i. Symbiotic N2 fixing bacteria VAM
ii. Free-living N2 fixing bacteria Rhizobium
iii. Phosphate solubilizer Nostoc
iv. Endomycorrhizae Microccocus
[11] Enhancement of Food Production
Chapter: [11] Enhancement of Food Production
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Describe the structure of sex chromosomes with the help of labelled diagram.

[3] Inheritance and Variation
Chapter: [3] Inheritance and Variation
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Explain the structure of chromosomes with labelled diagram.

[3] Inheritance and Variation
Chapter: [3] Inheritance and Variation
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Draw diagrammatic representation of cardiac cycle. Explain ventricular systole.

[8] Respiration and Circulation
Chapter: [8] Respiration and Circulation
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Which one of the following is not a nitrogen-fixing organism?

[11] Enhancement of Food Production
Chapter: [11] Enhancement of Food Production
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Briefly describe the following:

Angina Pectoris

[6] Plant Water Relation
Chapter: [6] Plant Water Relation
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Abscission means ______.

[7] Plant Growth and Mineral Nutrition
Chapter: [7] Plant Growth and Mineral Nutrition
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Match the pairs:

  Column A   Column B
(i) Compost making
biofertilizer
(a) Azotobacter
(ii) N2 fixing biofertilizer (b) Mycorrhiza
(iii) Fungal biofertilizer (c) Agrobacterium
(iv) Phosphate solubilizing
biofertilizer
(d) Actinobocteria
[11] Enhancement of Food Production
Chapter: [11] Enhancement of Food Production
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Complete the chart:

S. No. Gland Hormone produced Effect
(i) Hypothalamus ______ Acts on kidneys, stimulates reabsorption of water.
(ii) ______ Somatotropin Stimulates growth and development of all tissues
(iii) Thyroid gland ______ Regulates basal metabolic rate.
(iv) ______ Thymosin Maturation of T-lymphocytes.
[9] Control and Co-ordination
Chapter: [9] Control and Co-ordination
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What is Cardiac output?

[8] Respiration and Circulation
Chapter: [8] Respiration and Circulation
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Complete the following box with reference to symptoms of mineral deficiency:

Abscission Pre-mature fall of flowers,
fruits and leaves
______ Appearance of green and
non-green patches on leaves
[7] Plant Growth and Mineral Nutrition
Chapter: [7] Plant Growth and Mineral Nutrition
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Differentiate between X-chromosome and Y-chromosome with reference to –

  1. length of non-homologous regions
  2. type as per the position of the centromere
[3] Inheritance and Variation
Chapter: [3] Inheritance and Variation
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Enlist role and deficiency symptoms of Zinc.

[7] Plant Growth and Mineral Nutrition
Chapter: [7] Plant Growth and Mineral Nutrition
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Enlist role and deficiency symptoms of Calcium.

[7] Plant Growth and Mineral Nutrition
Chapter: [7] Plant Growth and Mineral Nutrition
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Aspergillus niger is used to manufacture

[11] Enhancement of Food Production
Chapter: [11] Enhancement of Food Production
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Give the name of the deficiency caused due to sulphur in stem and root.

[7] Plant Growth and Mineral Nutrition
Chapter: [7] Plant Growth and Mineral Nutrition
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Give reason: Some deficiency symptoms of mineral are visible in young leaves while some appear in older leaves.

[7] Plant Growth and Mineral Nutrition
Chapter: [7] Plant Growth and Mineral Nutrition
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Give reason:

The wall of left ventricle is thicker than right ventricle

[8] Respiration and Circulation
Chapter: [8] Respiration and Circulation
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Give observed symptom when the following mineral are deficient.

Deficiency of Cu

[7] Plant Growth and Mineral Nutrition
Chapter: [7] Plant Growth and Mineral Nutrition
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Give observed symptom when the following mineral are deficient.

Deficiency of Bo

[7] Plant Growth and Mineral Nutrition
Chapter: [7] Plant Growth and Mineral Nutrition
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