Biology MCQs with answers Page - 259

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Q. Which blood vessel carries oxygenated blood from the lungs to the heart?

  • (A) Pulmonary artery
  • (B) Pulmonary vein
  • (C) Aorta
  • (D) Vena cava

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Q. Which chamber of the human heart pumps oxygenated blood to the entire body?

  • (A) Right atrium
  • (B) Right ventricle
  • (C) Left atrium
  • (D) Left ventricle

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Q. Which is the largest gland in the human body?

  • (A) Pancreas
  • (B) Liver
  • (C) Thyroid
  • (D) Pituitary

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Q. Which blood group is known as the universal donor for red blood cell transfusion?

  • (A) AB positive
  • (B) A positive
  • (C) O negative
  • (D) B negative

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Q. Which component of blood is mainly responsible for clotting?

  • (A) Red blood cells
  • (B) White blood cells
  • (C) Platelets
  • (D) Plasma

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Q. Which part of the human respiratory system is the primary site of gas exchange?

  • (A) Trachea
  • (B) Bronchi
  • (C) Alveoli
  • (D) Larynx

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Q. Which mineral is essential for the formation of haemoglobin?

  • (A) Calcium
  • (B) Iron
  • (C) Sodium
  • (D) Potassium

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Q. Which part of a plant absorbs water and minerals from the soil?

  • (A) Stem
  • (B) Leaves
  • (C) Root hairs
  • (D) Flowers

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Q. Which tissue transports water and minerals from roots to other parts of a plant?

  • (A) Phloem
  • (B) Xylem
  • (C) Cambium
  • (D) Epidermis

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Q. Which tissue transports food from leaves to other parts of a plant?

  • (A) Xylem
  • (B) Phloem
  • (C) Cork
  • (D) Collenchyma

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