In which of the following organisms is the presence of a rigid cell wall observed?

Which of the following is a common characteristic shared by yeast and bryophytes?

Match the different types of spores listed under column $I$ with the names of the organisms given under column $II$. Choose the answer which gives the correct combination of the alphabets of the two columns.
Column $I$ (Spores) | Column $II$ (Organisms)
$(A)$ Ascospores | $p$ Diatoms
$(B)$ Endospores | $q$ Agaricus
$(C)$ Auxospores | $r$ Bacteria
$(D)$ Basidiospores | $s$ Yeast
| $t$ Nephrolepis

Which one single organism or the pair of organisms is correctly assigned to its taxonomic group?

What is the nature of the offspring produced by organisms included in Protista and Monera?

In the five-kingdom system,the main basis of classification is