Which of the kingdoms in Whittaker's classification include producers?

The sexual system of classification is:

Select the mismatched pair from the following.

What does the given figure represent?

Identify the odd one out from the given groups based on their biological classification.

Consider the following statements $(A-D)$:
$(A)$ Heterocysts are important sites for nitrogen fixation in $\text{BGA}$.
$(B)$ Cell wall of diatoms is indestructible due to presence of calcium carbonate.
$(C)$ In fungi,the cell wall is made up of chitin.
$(D)$ Algae show isogamous,anisogamous,and oogamous types of sexual reproduction.
How many of the above statement$(s)$ is/are not correct?