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Question

Read the following four statements (A-D).

(A) Both photophosphorylation and oxidative phosphorylation involve the uphill transport of protons across the membrane.

(B) In dicot stems, a new cambium originates from the cells of the pericycle at the time of secondary growth.

(C) Stamens in flowers of Gloriosa and Petunia are polyandrous.

(D) Symbiotic nitrogen fixers occur in a free-living state also in soil.

How many of the above statements are right?


A

Four

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B

Three

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C

One

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D

Two

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Solution

The correct option is

C

Two

Polyandrous condition (having a 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 utilizable 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 e.g., Rhizobium is a 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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