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Photosynthesis in Higher Plants question

2012 · Q16
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Photosynthesis in Higher Plants question

2012 · Q16

NEETBiologyPhotosynthesis in Higher PlantsMCQ+4 / −1
Read the following four statements (A −-− D). phosphorylation involve uphill transport of protons across the membrane.
(A)  Both photophosphorylation and oxidative phosphorylation involve uphill transport of protons across the membrane.
(B)  In dicot stems, a new cambium originates from cells of pericycle at the time of secondary growth.
(C)  Stamens in flowers of Gloriosa and Petunia are polyandrous.
(D)  Symbiotic nitrogen fixers occur in free-living state also in soil.

How many of the above statements are right?
  1. A
    Two
  2. B
    Three
  3. C
    Four
  4. D
    One
View written solutionFree

Correct answer: A

Polyandrous condition (having large and indefinite number of stamens) is present in Gloriosa (family liliaceae) and Petunia (family solanaceae). Nitrogen fixation is the conversion of inert atmospheric nitrogen into utilisable compounds of nitrogen like nitrate, ammonia, amino acids, etc. Biological nitrogen fixation is performed by free living and symbiotic bacteria and cyanobacteria.

Symbiotic nitrogen fixers occur in association with roots of higher plants. For example Rhizobium is nitrogen fixing bacterial symbiont of papilionaceous roots and Frankia is symbiont in root nodules of several non-leguminous plants like Casuarina. Both Rhizobium and Frankia live free as aerobes in the soil and develop the ability to fix nitrogen only as symbionts when they become anaerobic.

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