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The process responsible for facililating loss of water in liquid form from the tip of grass blades at night and early morning is:
Option: 1 Transpiration
Option: 2 Root pressure
Option: 3 Inhibition
Option: 4 Plasmolysis  

 Effects of root pressure is observable at night and early morning when evaporation is low, and excess water collects in the form of droplets around special openings of veins near the tip of grass blades, and leaves of many herbaceous parts. Such water loss in its liquid phase is known as guttation.

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Ritika Jonwal

The product (s) of reaction catalyzed by nitrogenase  in root nodules of leguminous plants is /are :
Option: 1 Ammonia alone
Option: 2 Nitrate alone
Option: 3 Ammonia and oxygen
Option: 4 Ammonia and hydrogen  

Nitrogenase converts nitrogen into ammonia. Hence, the correct option is (a).

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Ritika Jonwal

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Secondary metabolites such as nocotine, strychnine and caffein are produced by plants for their :
Option: 1 Nutritive value
Option: 2 Growth response
Option: 3 Defence action
Option: 4 Effect on reproduction

 

Secondary metabolites in plants help in defense action. 

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Ritika Jonwal

Which of the following is not an inhibitory substance governing seed dormancy?
Option: 1 Gibberellic acid
Option: 2 Abscisic acid
Option: 3 Phenolic acid
Option: 4 Para-ascorbic acid  

 Gibberellic acid is not an inhibitory substance governing seed dormancy.

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Ritika Jonwal

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In light reaction plastoquinone facilitates the transfer of electrons from:
Option: 1 PS II to Cytb_6f complex
Option: 2 Cytb_6f complex\:PS -I to
Option: 3 PS -I to\: NADP^-
Option: 4 PS -I to\: ATP\: synthase

In light reaction, plastoquinone facilitates the transfer of electrons from  PS II to Cytb_6f complex

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Ritika Jonwal

Match the following concerning essential elements and their function in plants:

a Iron (i) Photolysis of water
b Zinc (ii) Pollen germination
c Boron (iii) Required for chlorophyll biosynthesis
d Manganese (iv) IAA biosynthesis


Option: 1

(a) (b) (c) (d)
(ii) (i) (iv) (iii)


Option: 2

(a) (b) (c) (d)
(iv) (iii) (ii) (i)


Option: 3

(a) (b) (c) (d)
(iii) (iv) (ii) (i)


Option: 4

(a) (b) (c) (d)
(iv) (i) (ii) (iii)

 

In option (b) the essential elements are matched with their correct function in plants.

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Ritika Jonwal

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Name the plant growth regulator which upon spraying on sugarcane crop, increases the length of the stem, thus increasing the yield of sugarcane crop
 
Option: 1 Cytokinin
 
Option: 2 Gibberellin
 
Option: 3 Ethylene
 
Option: 4 Abscisic acid

Gibberellin is that plant growth regulator which upon spraying on sugarcane crop, increases the length of the stem, thus increasing the yield of sugarcane crop.

Hence, the correct option is (b). 

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Ritika Jonwal

The number of substrate-level phosphorylations in one turn of the citric acid cycle is  
Option: 1 Zero
 
Option: 2 One
 
Option: 3 Two
 
Option: 4 Three

The number of substrate-level phosphorylations in one turn of the citric acid cycle is 2.

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Ritika Jonwal

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The oxygenation activity of RuBisCo enzyme in photorespiration leads to the formation of :
Option: 1 2 molecules of 3- C compound
 
Option: 2 1 molecule of a 3-C compound
 
Option: 3 1 molecule of a 6-C compound
 
Option: 4 1 molecule of a 4-C compound and 1 molecule of a 2-C compound

The RuBisCo by oxygenation activity forms 1 molecule of 3PGA which is a 3-carbon compound.

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Ritika Jonwal

In which plant will you look for mycorrhiza and coralloid roots? Also, explain what these terms mean.

Mycorrhiza, which is also known as ‘fungus-root’, is basically a mutually beneficial relationship between that of plant root and a fungus. In most cases, the fungus grows within the roots of the plants and helps the plant to absorb water and nutrients, and in return, the plant provides the fungus with food. E.g., Pinus. In some cases, the fungus could be harmful to the plants. 

Coralloid Roots: These roots are associated with nitrogen-fixing cyanobacteria. In coralloid roots, the nodules are formed in large numbers, in the roots giving them coralloid appearance. E.g. Cycas and plants of Leguminosae.

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Safeer PP

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