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Life Processes Test - 42

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Life Processes Test - 42
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  • Question 1
    1 / -0
    Arteries are best defined as the blood vessels which:
    Solution
    Arteries are the blood vessels that carry blood away from the heart to the organs. These carry oxygenated blood except the pulmonary artery that carries deoxygenated blood. An artery breaks up into several branches of capillaries before entering the organs. These capillaries again reunite to form venules and ultimately veins which carry the deoxygenated blood towards the heart. All veins except the pulmonary veins carry deoxygenated blood.
    So, the correct option is D.
  • Question 2
    1 / -0
    Which of the following blood cells help in blood coagulation?
    Solution
    Red blood cells or RBCs are the most common blood cell type and contain hemoglobin, which is the principal means of delivering oxygen.
    A lymphocyte is a type of white blood cell, that is important in the immune system.
    A basophil is also a type of white blood cell that is responsible for immune responses during allergic reactions.
    Thrombocytes, also known as platelets, are crucial for blood clotting.
    Thus, the correct option is (C), 'Thrombocytes'.
  • Question 3
    1 / -0
    Manifestation of increase in the blood pressure of a person is called
  • Question 4
    1 / -0
    Lymph is colourless due to the:
    Solution
    Lymph is a clear watery fluid that appears colourless. This is because it lacks red blood cells (erythrocytes). It consists of plasma and white blood cells (leucocytes) only.
    So, the correct answer is option D.
  • Question 5
    1 / -0
    Blood returns from lungs to the heart into the?
    Solution
    • The oxygenated blood leaves the lungs through pulmonary veins, which return it to the left heart, completing the pulmonary cycle. 
    • This blood then enters the left atrium, which pumps it through the mitral valve into the left ventricle. 
    • So, the correct option is 'Left atrium'.
  • Question 6
    1 / -0
    All arteries carry oxygenated blood except:
    Solution
    • All arteries carry oxygenated blood except pulmonary artery.
    • The pulmonary artery is the artery that carries blood from the heart to the lungs. It carries deoxygenated blood from the heart to the lungs where it gets oxygenated.

    So, the correct answer is 'Pulmonary'.

  • Question 7
    1 / -0
    The function of villi in the intestine is
    Solution
    The villi and microvilli, with many folds, present on the lining of the small intestine, increase the surface area of the intestine for more absorption of the nutrients.
    Thus, the correct answer is option B.
  • Question 8
    1 / -0
    Lymph differs from blood in having:
    Solution
    The lymph is a whitish fluid that is derived from the interstitial fluid that circulates throughout the lymphatic system. It contains a variety of substances like proteins, glucose, water, salts, fats and white blood cells. It does not have RBCs.
    Thus, the correct answer is option 'C'.
  • Question 9
    1 / -0
    Mixing up of arterial and venous blood does not take place in a___________ heart.
    Solution
    • A heart with four chambers has two atria and two ventricles.
    Here the right ventricle pumps the oxygen-poor blood to the lungs and the left atrium receives oxygen-rich blood from the lungs and pumps it to the left ventricle. The left ventricle pumps oxygen-rich blood to the body.
    • The right side of the heart is separated from the left side due to the presence of the septum.
    • Hence, option  B is correct. 

  • Question 10
    1 / -0
    Plants which are unable to prepare their food wholly or partially are _______.
    Solution
    • Animals and some plants cannot produce their own food and must obtain their nutrition from outside sources— these plants are heterotrophic. For example - dodder is a parasitic plant that derives nutrition from its host.
    • Autophytes are plants that can manufacture their own food. 
    • Halophytes are plants that grow in extremely saline conditions. 
    • Holophytes are the organism that prepares their food by photosynthesis.

    So, the correct answer is option B.
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