Read the following four statements (A-D) :

(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?

  • Option 1)

    Three

  • Option 2)

    Four

  • Option 3)

    One

  • Option 4)

    Two

 

Answers (1)

 

Symbotic nitrogen fixing bacteria -

1. Rhizobium - associated with roots of legume plants

2. Azolla (water fern) - associated with Anabaena azollae

3. Coralloid roots of Cycas -associated with Anabaena and Nostoc

-

 

 Symbiotic nitrogen fixing bacteria occurs in free living state in association with another organisms(Anaboena,Nostoc, etc). Also in dicot stems , some medullary rays cells become interfascicular cambium.  

 


Option 1)

Three

Incorrect option

Option 2)

Four

Incorrect option

Option 3)

One

Incorrect option

Option 4)

Two

Correct option

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