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Cell Structure and Functions Test - 21

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Cell Structure and Functions Test - 21
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  • Question 1
    1 / -0
    Classify the following terms into cells, tissues and organs.
    RBCs, WBCs, nerve cells, blood, muscle, blood vessels, brain, heart, hand
    Solution
    • A cell is the smallest form containing the genetic material, cell organelles, cytoplasm and it can replicate to give rise to new cells such as RBCs, WBCs, and nerve cells.
    • A group of cells that are structurally similar and or work together to perform a particular function is called a tissue such as blood and muscles.
    • The collection of such tissues, which are joined in a structural unit to perform a certain function is called an organ such as heart, brain, blood vessels. 
    Thus, the correct answer is option A.
  • Question 2
    1 / -0
    The outermost boundary wall of an animal cell is called as the 
    Solution

    • The plasma membrane is the common boundary between the cell and its environment in all cells. 
    • But it is the outermost covering of the animal cells. It is elastic and semipermeable membrane and regulates what enters and exits the cell. 
    • The cell wall forms the outermost boundary of plant cells.
    • Hence the correct option is A.

  • Question 3
    1 / -0
    How many cells are present in human body?
    Solution
    Humans are complex organisms made up of more than trillions of cells, each with their own structure and function. Thus, Option D is correct.
  • Question 4
    1 / -0
    The living substance of cell was named by Dujardin as____________________
    Solution
    • Dujardin applied the name 'sarcode' to the free plasma without a covering to protect it from the contact with the outer world. So, the living things were named as a sarcode.

    Thus, the correct answer is option C.
  • Question 5
    1 / -0
    The organisms lacking nuclear membrane and cell organelles is called as 
    Solution
    Prokaryotes are unicellular primitive organisms that possess nucleus without the nuclear membrane. They do not possess membrane-bound cell organelles.
    Thus, the correct answer is option A.
  • Question 6
    1 / -0
    The ratio of inorganic matter to organic matter in a cell is ______.
    Solution
    Usually there are more organic components than inorganic components in a cell in terms of concentration and weight.
    So, the correct answer is option B.
  • Question 7
    1 / -0

    Out of the following, select the correct match for the label given in the figure.

    Solution
    A is the chloroplast. They are green coloured plastids, which comprises green coloured pigments within the plant cell and are called chlorophyll.
    B is the cell wall. It is the tough, flexible, sometimes rigid outer covering of the cell outside the cell membrane. It gives support, protection and acts as filtering mechanism.
    C is the vacuole. It have a simple structure and are surrounded by a thin membrane and filled with fluid and molecules they take in.
    D is nuclear pore. Nuclear pore is a protein-lines channel in the nuclear envelope that regulates the transportation of molecules between the nucleus and the cytoplasm.
    E is rough endoplasmic reticulum. It is an organelle found in eukaryotic cells. Its main function is to produce proteins. It is made of cisternae which are together held by a cytoskeleton.
    F is plasma membrane. Plasma membrane is made up of  proteins and lipids and it protects the cell from its surroundings.
    G is the centriole. They are paired barrel shaped organelles located in the cytoplasm of animal cell near nuclear envelope and they plays a role in organizing microtubules that serve as the cell's skeletal system.
    H is mitochondria. It is a double membrane bound organelle found mostly in eukaryotes. Their function is to generate ATP and thus to produce energy.
    So, the correct option is (A).
  • Question 8
    1 / -0
    Which of the following can be used to stain cells?
    Solution
    Cells are stained to enhance visualization of the cell or certain cellular components under a microscope. Some of the examples of staining solutions are methylene blue solution, iodine solution, safranin solution, etc.
    So, the correct answer is option D.
  • Question 9
    1 / -0
    Match the following and pick the correct options given.  
    Cell organelleFunction
    a. Endoplasmic reticulum1. Take part in cellular respiration
    b. Free ribosomes2. Take part in osmoregulation and excretion
    c. Mitrochondrion3. Synthesize lipids
    d. Contractile vacuole4. Synthesize non secretory proteins
    Solution
    Smooth endoplasmic reticulum does not have ribosomes on their surface and involved in producing lipids. SER also take part in detoxification. Mitochondria is a large double membrane bound cell organelle involved in aerobic respiration and produces energy in the form of ATP.
    The contractile vacuole is seen in some protists and is involved in osmoregulation. They pick up water from surrounding cytoplasm, expand and collapse to throw out water to the outside.
    The free ribosomes translate the genetic message encoded in mRNA and synthesize peptide units. 
    So, the correct answer is option A.
  • Question 10
    1 / -0
    Which part of the cell controls the various functions of the cell? 
    Solution
    The nucleus is the most important part of the cell which regulates all the cellular activities. It is also called the control center of the cell.
    Hence, the correct option is A.
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