Which of the following statements is correct?

1. Organisms that depend on living plants are called saprophytes.

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

3. The fusion of two cells is called Karyogamy.

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

Subtopic:  Kingdom Fungi: Introduction | Kingdom Fungi: Sexual Reproduction in Fungi |
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