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Getting To Know Plants Test - 7

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Getting To Know Plants Test - 7
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Weekly Quiz Competition
  • Question 1
    1 / -0
    The number of fine outgrowths present on the surface of roots is called _______.
    Solution
    • The roots give out fine hair-like outgrowths called the root hairs that absorb water and minerals

    So, the correct answer of 'root hairs'
  • Question 2
    1 / -0
    The process of uptake of CO$$_{2}$$ and release of O$$_{2}$$ by plants is known as:
    Solution
    The green plants carry on the process of photosynthesis. During this process, they take in carbon dioxide from the atmosphere and reduce it to sugars. Simultaneously green plants absorb water from the soil and oxidize it by the process of photolysis to release electrons and oxygen as a by-product of photosynthesis. 
    So, the correct answer is option A.
  • Question 3
    1 / -0
    Strawberry is a:
    Solution
    Strawberry plant is a creeper because it does not have tendrils or twiners which are required by a plant for attaching themselves to the supporting plant/object. They crawl on the ground.
    Thus, the correct option is 'B'.
  • Question 4
    1 / -0
    Root hair have ................. walls.
    Solution
    Root hair has thin walls. It is a two-layered structure. The outer layer is the cell wall and the inner layer forms the cell membrane. The outer cell wall is extremely thin like that of the cell wall but is semipermeable. As a result of this property, the water molecules can move through but the large molecules of dissolved salts cannot. It is only because of this property that the water gets absorbed from the soil by the roots.
    So, the correct answer is option B. 
  • Question 5
    1 / -0
    When a stem is placed in a glass with coloured water, what do you observe?
    Solution
    When a stem is placed in coloured solution, the stem first takes up the colour which then spreads to the leaves. This shows that water moves upward through the stem and reaches the leaves.
  • Question 6
    1 / -0
    Nodulated roots occur in:
    Solution
    Nodulated roots are usually found in pea plants because they are found in association with a nitrogen-fixing bacterium called Rhizobium. This rhizobium resides in these nodules. Nitrogen fixation is essential for plants as they cannot directly absorb nitrogen from the atmosphere.
    So, the correct option is 'A.
  • Question 7
    1 / -0
    The main function of a leaf is:
    Solution
    • The main function of the leaf is photosynthesis. The whole plant gets food through photosynthesis. The leaves have a photosynthetic pigment chlorophyll, which converts light energy into chemical energy. 
    • The leaf is also involved in the transpiration process. The transpiration process helps in the cooling of the plant. 
    • The exchanges of gases take place through stomata present on the leaves. 
    • Yet, the most important function of a leaf is photosynthesis. 
    Thus, the correct answer is option C.
  • Question 8
    1 / -0
    Which of the following is not needed for photosynthesis?
    Solution
    • Photosynthesis is a chemical reaction that takes place inside a plant, producing food for the plant to survive. Carbon dioxide, water and light are all needed for photosynthesis to take place. Chlorophyll is a green photosynthetic pigment found in plants, algae, and cyanobacteria. Chlorophyll is vital for photosynthesis, it allows plants to absorb energy from light.
    • Iodine solution is not required for photosynthesis.
    So, the correct answer is 'Iodine solution'.
  • Question 9
    1 / -0
    'Quiescent centre' is found in:
    Solution
    The quiescent centre (QC) is a small group of cells with low mitotic activity (they divide sometimes, but only rarely). QC's are to be found at the tips of growing roots, in the root meristem, and are typically surrounded by groups of initial cells. Through rounds of cell division, these initial cells give rise to the various tissues of the root and so there are usually vascular initials, pericycle initials, cortex initials etc. It is thought that the QC sends out signals to these initial cells to ensure that they remain in an initial state and keep dividing to produce whatever tissue they are responsible for. So, root apex has a zone of slow dividing cells in the middle of rapidly dividing cells which is called as quiescent centre. 
  • Question 10
    1 / -0
    Roots breathe through
    Solution
    Roots breathe with the help of epidermal cell outgrowths called the root hair that brings about the exchange of gases through diffusion
    So, the correct answer is 'Root hair'
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