Which of the following domains lacks a cell wall?

Select the correct pair from the following.

Which of the following does not belong to Kingdom Monera?

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?

Which of the following kingdoms consists of organisms that possess a well-defined nucleus and membrane-bound organelles?

Which of the following classification systems represents the evolutionary relationship of organisms?