Biology
The nitrogen fixing bacteria present in the root nodules of leguminous plant is

Rhizobium
Clostridium
Pseudomonas
Salmonella

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Biology
Which is not a function of the cell membrane?

Allows the cell to change shape under pressure
Helps substances pass from the cytoplasm into the nucleus
Keeps materials within the cell separated from the environment outside the cell
Helps control the movement of materials into and out of the cell

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