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Rajasthan Board Class 10 (RBSE) Lifelines of National Economy — practice questions

Explore 3 free Lifelines of National Economy questions in Rajasthan Board Class 10 (RBSE) Biology. Open each question or exercise to read its content, reference answers and available explanation.

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Lifelines of National Economy questions and exercises with answers

Showing questions 1–3 of 3.

As per your syllabus, Biology Ch 5, how many CHAMBERS does the human heart have?Read the answer and worked solution →As per your syllabus, oxygen-rich blood from the lungs enters which chamber of the heart FIRST?Read the answer and worked solution →As per your syllabus, the RIGHT VENTRICLE pumps blood to which destination?Read the answer and worked solution →

Worked practice questions

As per your syllabus, Biology Ch 5, how many CHAMBERS does the human heart have?

  1. Three chambers
  2. Four chambers — 2 atria (upper) + 2 ventricles (lower)
  3. Two chambers only
  4. Six chambers
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Correct answer: B. Four chambers — 2 atria (upper) + 2 ventricles (lower)

As per your syllabus, Fig 5.10, human heart has 4 chambers (2 atria + 2 ventricles). Fish has 2; amphibians/most reptiles have 3.

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As per your syllabus, oxygen-rich blood from the lungs enters which chamber of the heart FIRST?

  1. Aorta directly
  2. Right atrium
  3. Left atrium
  4. Right ventricle
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Correct answer: C. Left atrium

As per your syllabus, oxygenated blood from lungs → left atrium → left ventricle → body via aorta.

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As per your syllabus, the RIGHT VENTRICLE pumps blood to which destination?

  1. The LUNGS (for oxygenation)
  2. The right atrium
  3. The body via the aorta
  4. The intestines directly
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Correct answer: A. The LUNGS (for oxygenation)

As per your syllabus, right ventricle pumps deoxygenated blood to lungs for oxygenation. Left ventricle pumps to body.

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