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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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add a note on deficiency of thyroxine.

[9] Control and Co-ordination
Chapter: [9] Control and Co-ordination
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Explain the types of chromosomes on the basis of position of centromere.

[3] Inheritance and Variation
Chapter: [3] Inheritance and Variation
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What is VAM?

[11] Enhancement of Food Production
Chapter: [11] Enhancement of Food Production
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Give two examples of microbial pesticides with their hosts.

[11] Enhancement of Food Production
Chapter: [11] Enhancement of Food Production
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Which of the following is mesodermal is the origin?

[8] Respiration and Circulation
Chapter: [8] Respiration and Circulation
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_______ maintains basic metabolic rate.

(A) Thyroxine

(B) ADH

(C) GH

(D) Oxytocin

[9] Control and Co-ordination
Chapter: [9] Control and Co-ordination
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Name of the valve between the left atrium and left ventricle and give its significance.

[8] Respiration and Circulation
Chapter: [8] Respiration and Circulation
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Describe the structure of chromosomes with a suitable diagram.

[3] Inheritance and Variation
Chapter: [3] Inheritance and Variation
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What is Sinus arrhythmias?

[8] Respiration and Circulation
Chapter: [8] Respiration and Circulation
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Classify the chromosomes on the basis of position of centromere.

[3] Inheritance and Variation
Chapter: [3] Inheritance and Variation
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Explain with the help of a suitable diagram conducting system of human heart.

[8] Respiration and Circulation
Chapter: [8] Respiration and Circulation
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Distinguish between X and Y chromosomes.

[3] Inheritance and Variation
Chapter: [3] Inheritance and Variation
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The help of a well-labelled diagram describes the internal structure of the human heart.

[8] Respiration and Circulation
Chapter: [8] Respiration and Circulation
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Answer in only one sentence of the following question: 

Mention the role of the pacemaker in human heart. 

[8] Respiration and Circulation
Chapter: [8] Respiration and Circulation
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Describe the structure of sex-chromosomes. 

[3] Inheritance and Variation
Chapter: [3] Inheritance and Variation
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Multiple choice question.

Which one of the following is a set of discrete endocrine glands?

[9] Control and Co-ordination
Chapter: [9] Control and Co-ordination
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Short Answer Question.

Explain the chromosomal theory of inheritance.

[3] Inheritance and Variation
Chapter: [3] Inheritance and Variation
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Write a note on biocontrol agents.

[11] Enhancement of Food Production
Chapter: [11] Enhancement of Food Production
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Long answer question.

What is adaptive radiation? Explain with suitable example.

[5] Origin and Evolution of Life
Chapter: [5] Origin and Evolution of Life
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Define vernalization.

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