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Photosynthesis in Higher Plants

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Question
CBSEENBI11002058
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A plant in your garden avoids photorespiratory losses, has improved water use efficiency, shows high rate of photosynthesis at high temperatures and has improved efficiency of nitrogen utilisation. In which of the following physiological groups would you assign this plant?

  • C4

  • CAM

  • Nitogen-fixer

  • C3

Solution

A.

C4

C4 plants show very little photorespiration and better utilisation of water. 

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Question
CBSEENBI11002627
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A plant requires magnesium for

  • holding cells together

  • protein synthesis

  • chlorophyll synthesis

  • cell wall development

Solution

C.

chlorophyll synthesis

Magnesium is important constituent of chlorophyll molecule.

Question
CBSEENBI11002187
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A process that makes important difference between C3 and C4 plants is

  • transpiration

  • glycolysis

  • photosynthesis

  • photorespiration

Solution

D.

photorespiration

Photorespiration is a light dependent process which occurs in C3 plants. It is opposite to photosynthesis because during this process uptake of O2 and release of CO2 take place. Due to the presence of Kranz anatomy, C4 plants do not show photorespiration. 

Question
CBSEENBI11002169
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Anoxygenic photosynthesis is characteristic of 

  • rhodospirlllum

  • Spirogyra

  • Chlamydomonas

  • Ulva

Solution

A.

rhodospirlllum

Anoxygenic photosynthesis (in which O2 is not released) is seen in Rhodospirillum, a purple non- sulphur bacteria. it helps an organism to trap light energy and store it as chemical energy.

Question
CBSEENBI11002446
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C4 plants are more efficient in photosynthesis than C3 plants due to 

  • higher leaf area

  • the presence of a larger number of chloroplasts

  • the presence of thin cuticle

  • Lower rate of photorespiration

Solution

B.

the presence of a larger number of chloroplasts

Like Plants, alage have cell walls contain either polysaccharides such as cellulose (a glucan) or a variety of glycoproteins or both. The inclusion of additional polysaccharide in algal cell walls is used as a feature for algal taxonomy. Mannas form microbibrils in the cell walls of a number of marine green alge including those from the genera Codium, Acetabularia as well as in the walls of some red algae including those from the gera Codium, Acteabularia as well as in the walls of some red algae like Porpyra.

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