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?

Identify the mismatched pair from the following.

Bacteria and yeast are similar in all features except one. Identify the exception.

Identify the odd one out:

Which of the following statements are incorrect based on the Whittaker classification system?
$I.$ Whittaker classified organisms into unicellular and multicellular based on the complexity of cell structure.
$II.$ Whittaker classified organisms as producers,decomposers,and consumers based on their ecological roles.
$III.$ Organisms were divided into unicellular and multicellular based on the complexity of body organization.
$IV.$ Prokaryotic and eukaryotic organisms were divided based on their mode of nutrition.

Saprobiotic and parasitic modes of nutrition are found in