Water provides the medium for enzymatic ...

Water provides the medium for enzymatic activites needed for growth while oxygen helps in releasing metabolic energy essential for growth activities.

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Two of the following amino are needed for growth only and are not essential for adults.

Water while freezing releases _____ energy.

Assertion : Nutrients are required by plants for the synthesis of protoplasm and act as source of energy. Reason : Water provides the medium for enzymatic activities needed for growth.

[A]: Elongation and division of cells are pro- moted by gibberellins. [R]: Gibberellins increase the formation of hydrolytic enzymes that release energy nec- essary for growth

Go through the following statements (i) In geometr,ic growth, following mitotic cell division, only one daughter cell con- tinues to divide while the other differen- tiates and mature. (ii) The ability of plants to follow different pathways in response to environment or phases of life to to.rm different kinds of structures, is called plasticity. (iii) The mathematical expression for arith- metic growth is Lt = L_0 + rt while for geo- metric growth, it is W_1=W_0=W_(0)e^(rt) (iv) The form of growth wherein new cells are always being added to the plant body by the activity of the meristem, is called the open form of growth. Which of these are correct .

Assertion: Crustose lichens, in a lithosere, secrete organic acids causing the weathring of rocks so that minerals essential for proper growth of lichens are released. Reason: Early colonists in a primary suceession are usually lichens, which suggests that colonisation is easier when an organism has a mutualistic association.

Each of the following questions has four choices. Choose the correct option in each case: Which component provides energy for various metabolic activities:

Mark out the number of incorrect statement/s: [I] Some essential elements can alter the osmotic potential of a cell. [II] Nitrogen is required by the meristematic tissue and the metabolically active cells only. [III] Mg^(2+) is needed by several respiratory enzymes. [IV] Mo is essential for the water-splitting reaction in photosynthsis, a reaction that leads to oxygen evolution. [V] Sulphur is the main constituent of several coenzymes, vitamins (thiamine, biotin, coenzyme-A) and ferrodoxin.

Which of the following factors are responsible for the increase in the rate of a surface catalysed reaction? (i) A catalyst provides proper orientation for the reactant molecules to react. (ii) heat of adsorption of reactants on a catalyst helps reactant molecules to overcome activation energy. (iii) The catalyst increases the activation energy of the reactio.

Which of the following statements regarding eutrophication are correct ? (i) Eutrophication is the natural ageing of a lake by nutrient enrichment of its water. (ii) Pollutants from human activities like effluents from the industries and homes can radically accelerate the aging process of a lake. This phenomenon is called as cultural or accelerated eutrophication. (iii) The plant nutrients responsible for eutrophication are nitrates and phosphates. (iv) These phosphates and nitrates accelerate the growth of algae, which utilise oxygen and may deoxygenate the water to kill the fish and other aquatic animals.

ALLEN-PLANT GROWTH AND DEVELOPMENT-True and False

The leaves, flowers and fruits of the same tree not only have limited ...
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Development of a mature plant a zygote (ferilized egg) follow a precis...
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Read the following statements and find out the INCORRECT statement. ...
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Choose the correct or incorrect statement regarding given figure: ...
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Water provides the medium for enzymatic activites needed for growth wh...
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Assertion : Nutrients are required by plants for the synthesis of prot...
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Auxin (IAA) was first isolated from
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Spraying juvenile conifers with GA hastens the maturity period thus le...
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Kinetin occur naturally in plants.
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Natural cyitokinins are sytnhesised in regions where rapid cell diviso...
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Ethylene is used to initiate flowering and for synchorinising fruit se...
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Ethephon hastens fruit ripening in tomatoes and apples and accelerates...
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ABA plays an important role in seed development, maturation and dorman...
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Events like vernalization, flowering dormancy, seed germination and pl...
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In certain plants relative duration of light and dark period plays a i...
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Assertion : Vernalisation is the promotion of flowering by a period of...
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Some varieties of wheat are known as spring wheat while others are cal...
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Bennials are monocarpic plants that normally flower and die in the sec...
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Effect of vernalisation can not be seen in sugarbeet, cabbages and car...
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Winter varieties of annual plants are planted in autumn, they germinat...
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