How many organisms in the list given below are autotrophs?
Lactobacillus,Nostoc,Chara,Nitrosomonas,Nitrobacter,Streptomyces,Saccharomyces,Trypanosoma,Porphyra,Wolffia

Match the following columns:

Column-$I$	Column-$II$
$(A)$ Protista	$(i)$ Blue-green algae
$(B)$ Fungi	$(ii)$ Euglenoids
$(C)$ Plantae	$(iii)$ Molds
$(D)$ Animalia	$(iv)$ Conifers

What does the given figure represent?

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 pairs is not correctly matched?

The sexual system of classification is: