Which of the following statements is correct ?

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Some of the organisms can fix atmospheric nitrogen in specialized cells called sheath cells.

Fusion of two cells is called Karyogamy.

Fusion of protoplasms between two motile or non-motile gametes is called plasmogamy.

Organisms that depend on living plants are called saprophytes.

answer is C.

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Detailed Solution

Fusion of protoplasts of two organisms is called plasmogamy.
(1) Specialised cells of cyanobacteria involved in nitrogen fi xation are called heterocysts but not sheath cells.
(2) Fusion of two cells is called somatogamy and, if they are gametes, it is called gametogamy. Karyogamy is fusion of two nuclei.
(4) Organisms that depend on living plants are called parasites. Saprophytes grow on dead, decaying bodies of plants and animals.

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