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Cell Structure and Functions Test - 28

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Cell Structure and Functions Test - 28
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  • Question 1
    1 / -0
    Which one of the following is incorrect for the members of chrysophyta?
    Solution
    Chrysophyta are motile. They sometime produce flagellated motile zoospores during reproduction. They are also bivalved.
    Therefore the right answer is "These are nonmotile bivalved organism".
  • Question 2
    1 / -0
    Which of the following is found in a plant cell but not in animal cell?
    Solution
    • The cell wall is a rigid layer lying outside the plasma membrane of the cells of plants, fungi, and bacteria.
    • It is absent in the animal cell.
    • Mitochondria, cell membrane and nucleus are seen in both plant and animal cells.

    So, the correct answer is 'Cell wall'.
  • Question 3
    1 / -0
    Which of the following statements is false?
    Solution
    Correct Option: D
    Explanation:
    • Amoeba has no definite shape. It keeps on changing its shape. It has projections of varying lengths protruding out of its body. These are called pseudopodia. 
    • These projections appear and disappear as the amoeba moves or feeds. Hence, the amoeba has a finite shape is the false statement from the following.
  • Question 4
    1 / -0
    The smooth muscles in our body are_______.
    Solution
    • The smooth muscles in our body are thin, long and tapering at the ends resembling a spindle.
    • These are spindle shaped without striations and are found in walls of hollow organs such as stomach, intestine and blood vessels.
    • Thus, Option D is correct.
  • Question 5
    1 / -0
    Read the statements given about cytoplasm. Which of the following is correct?
    (a) Cytoplasm fills the animal cell.
    (b) Cytoplasm is a jelly-like substance.
    (c) Chlorophyll is found in the nucleus.
    (d) Cytoplasm and protoplasm are the same.
    Solution
    • Chlorophyll is found in chloroplasts which are organelles seen in the cytoplasm. 
    • The cytoplasm is the jelly-like matrix lying between plasma membrane and nucleus whereas protoplasm includes the entire living matter inside a cell including the nucleus. 
    • Hence the correct option is A.
  • Question 6
    1 / -0
    How do scientists observe and study living cells? 
    Solution
    Since microorganisms are not visible to the naked eye, scientists observe them using a microscope and stain them to distinguish their structures.
    Thus the correct answer is option C. 
  • Question 7
    1 / -0
    The example of a Prokaryotic cell is
    Solution
    Prokaryotic cells have primitive nucleus that lacks nuclear membrane. Bacteria and blue green algae are prokaryotes. All other organisms have eukaryotic cells.
    Hence the correct option is A.
  • Question 8
    1 / -0
    Fill in the blank:
    An organism with billions of cells begins life as a ________ which is the fertilised egg.
    Solution
    The fertilized egg is a single cell as two gametes with half the number of chromosomes fuse to give a cell with 23 pairs of chromosomes.
    The correct option is B.
  • Question 9
    1 / -0
    What is the shape of the muscle cells?
    Solution
    The muscle cells are spindle-shaped, RBCs are spherical while nerve cells are long and branched. There are no square-shaped cells.
    Thus, the correct answer is option A.
  • Question 10
    1 / -0
    A single-celled organism like an amoeba can
    i) capture and digest food
    ii) respire
    iii) excrete 
    iv) grow and reproduce
    Solution
    A single-celled organism performs all the necessary functions that multicellular organisms perform. A single-celled organism, like an amoeba, captures and digests food, respires, excretes, grows and reproduces like any other multicellular organism.
    The correct option is D.
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