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Mineral Nutrition Test - 24

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Mineral Nutrition Test - 24
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  • Question 1
    1 / -0
    Which is essential for root hair growth?
    Solution
    Calcium is an important constituent of middle lamellae in plants, where it is present as calcium pectate. Hence, actively growing regions of calcium like stem tip and root hairs essentially require calcium.
  • Question 2
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    Premature leaf fall is caused due to the deficiency of
    Solution
    Phosphorus plays a role in energy metabolism. It is actively involved in protein synthesis, photosynthesis, respiration and other metabolic processes. It also acts as an activator of some gene enzymes. Its deficiency causes:
    1. disruption of general metabolism particularly at the level of energy generation. 
    2. Abnormalities in shape and size of chloroplasts.
    3. Yellowing and drying of lower leaves.
    4. It promotes leaf fall and delays flowering.
    Thus, the correct answer is option D. 
  • Question 3
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    If chlorophyll is burnt, which of the following element will be left behind?
    Solution
    Magnesium is an important constituent of chlorophyll. Chlorophyll by definition are cyclic tetrapyrroles i.e., made up of  four pyrrole rings coordinated to a central magnesium atom. If a molecule of chlorophyll is burnt the organic part of the molecule will be lost and only mineral element i.e., magnesium will be left behind.
  • Question 4
    1 / -0
    The constant pH of body fluid is maintained by buffer salts like
    Solution
    If the pH of the body gets too low (below 7.4), a condition known as acidosis results. This can be very serious, because many of the chemical reactions that occur in the body, especially those involving proteins, are pH-dependent. Ideally, the pH of the blood should be maintained at 7.4. If the pH drops below 6.8 or rises above 7.8, death may occur. Fortunately, we have buffers in the blood to protect against large changes in pH. The constant pH of body fluid is maintained by buffer salts like sodium and potassium phosphates.
  • Question 5
    1 / -0
    Absence of Mg$$^{++}$$ ions from plant tissue result in
    Solution
    Magnesium in plants is responsible for the synthesis of chlorophyll which is required for the process of photosynthesis. Plants cannot capture light energy without magnesium and it also produces green colour in plants. Thus magnesium deficiency makes the leaves look yellow in colour due to the loss of chlorophyll. This loss of chlorophyll is known as chlorosis. 
    Plasmolysis is the process of shrinkage of plant protoplast when it is placed in a hypertonic solution. The cell membrane is the contents inside it come to lie on one side of the cell and the cell wall remains intact.
    Necrosis is a kind of cell injury in which the death of the tissue takes place. The continued deficiency of magnesium results in leaf necrosis and the dropping of the older leaves will occur.
    Thus, the correct answer is option D.
  • Question 6
    1 / -0
    Which one of the following element is not an essential micronutrient for plant growth?
    Solution
    Manganese, zinc and copper are essential micronutrients required by plants in small amounts. Calcium is an important essential macronutrient required by plants in large quantities primarily for cell wall synthesis.
  • Question 7
    1 / -0
    Which of the following is not a macro-nutrient?
    Solution
    Manganese is an important essential micronutrient in plants. Calcium, magnesium and phosphorous are all essential macronutrients.
  • Question 8
    1 / -0
    Which one is inorganic nutrient?
    Solution
    Organic means compounds of carbon. Vitamins, proteins, and cellulose are all organic compounds i.e., compounds made of carbon. Calcium is an inorganic mineral nutrient. It is an essential macronutrient.
  • Question 9
    1 / -0
    Presence of phosphorus in a plant
    Solution
    Phosphorus is an essential elements of plants. It helps in various processes such as photosynthesis, respiration, energy storage, energy transfer, cell division, etc. It helps in healthy root growth and hastening of maturity. This in turn enhances easy availability of nutrients present in the soil to plants.
    Thus, the correct answer is option A.
  • Question 10
    1 / -0
    The cause of special flavour in onion and garlic is due to the presence of
    Solution
    Onion and garlic both belong to the same genus Allium. The chemicals that give characteristic flavours to Allium vegetables are a class of compounds called amino acid sulfoxides. The chief chemical that also causes tears and bad breath is allyl methyl sulfide. The peeling and cutting of onion and garlic releases enzymes called allinases which convert these sulfoxides into sulfenic acids. These acids condense to give pungent odour. 
    Thus, the correct answer is option A. 
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