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

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Why are the walls of the left ventricle thicker than the other chambers of the heart?

[8] Respiration and Circulation
Chapter: [8] Respiration and Circulation
Concept: undefined >> undefined

Match the antibiotics in column I with their microbial sources in column II:

Column I Column II
(a) Chloromycetin (1) Streptomyces griseus
(b) Erythromycin (2) Streptomyces aurifaciens
(c) Streptomycin (3) Streptomyces venezuelae
(d) Terramycin (4) Streptomyces erythreus
[11] Enhancement of Food Production
Chapter: [11] Enhancement of Food Production
Concept: undefined >> undefined

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Match the following products with their microbial sources:

  Products   Microbial Sources
(a) Vitamin B2 (1)  Rhizopus arrhizus
(b)  Fumaric acid (2) Candida lipolytica
(c) Vitamin B12 (3) Trichoderma konigii
(d) Lipase (4)  Neurospora gossypii
(e) Cellulase (5) Pseudomonas denitrificans
(f) Citric Acid (6)  Aspergillus niger
[11] Enhancement of Food Production
Chapter: [11] Enhancement of Food Production
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Give advantages of vernalization.

[7] Plant Growth and Mineral Nutrition
Chapter: [7] Plant Growth and Mineral Nutrition
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Draw the neat Labelled diagram of the internal structure of the human heart.

[8] Respiration and Circulation
Chapter: [8] Respiration and Circulation
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Match the following pairs:

Column A Column B
Antibiotic produced Microbial source
(i)  Penicillin (a)  Streptomyces venezuelae
(ii)  Chloromycetin (b) Bacillus licheniformis
(iii) Bacitracin (c) Streptomyces aurifaciens
(iv) Erythromycin (d)  Streptomyces griseus
(v) Streptomycin (e) Penicillium chrysogenum
(vi)  Terramycin (f) Streptomyces erythreus
[11] Enhancement of Food Production
Chapter: [11] Enhancement of Food Production
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Draw a neat diagram of the conducting system of human heart and label AV node, Bundle of His and Purkinje fibres.

[8] Respiration and Circulation
Chapter: [8] Respiration and Circulation
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Give scientific reason.

Human heart is called as myogenic and autorhythmic.

[8] Respiration and Circulation
Chapter: [8] Respiration and Circulation
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Write the microbial source of following organic acid.

Citric acid

[11] Enhancement of Food Production
Chapter: [11] Enhancement of Food Production
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Write the microbial source of following organic acid:

Fumaric acid

[11] Enhancement of Food Production
Chapter: [11] Enhancement of Food Production
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Write the microbial source of following organic acid:

Acetic acid

[11] Enhancement of Food Production
Chapter: [11] Enhancement of Food Production
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In human foetus, the heart begins to beat at developmental age of

[8] Respiration and Circulation
Chapter: [8] Respiration and Circulation
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Which of the following is sex chromosomal disorder?

[3] Inheritance and Variation
Chapter: [3] Inheritance and Variation
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Give the meaning of pacemaker.

[8] Respiration and Circulation
Chapter: [8] Respiration and Circulation
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Give reason:

Valves are present in the veins.

[8] Respiration and Circulation
Chapter: [8] Respiration and Circulation
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Give reason:

Pulmonary veins carry oxygenated blood.

[8] Respiration and Circulation
Chapter: [8] Respiration and Circulation
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Write the microbial source of following organic acid:

Gluconic acid

[11] Enhancement of Food Production
Chapter: [11] Enhancement of Food Production
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Explain the term Fossa ovalis.

[8] Respiration and Circulation
Chapter: [8] Respiration and Circulation
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Explain the term Ligamentum arteriosum.

[8] Respiration and Circulation
Chapter: [8] Respiration and Circulation
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Explain the term Chordae tendinae.

[8] Respiration and Circulation
Chapter: [8] Respiration and Circulation
Concept: undefined >> undefined
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