Cell The Unit of Life — BIOLOGY STD 11 Science — Question

 $\begin{array}{|l|l|} \hline Column\,\,-\,\,I & Column\,\,-\,\,II  \\ \hline (1)\,\,Scolidon & (p)\,\,Saw\,\,fish \\ \hline (2)\,\,Pristis & (q)\,\,Sting\,\,fish  \\ \hline (3)\,\,Carcharodon & (r)\,\,Dog\,\,fish \\ \hline (4)\,\,Trygon & (s)\,\,Great\,\,white\,\,shark \\ \hline \end{array}$

($i$) It consists of a network of trachea, that open through $12$ pairs of small holes called spiracles present on the lateral side of the body.

($ii$) Thin branching tubes carry oxygen from the air to all the parts.

($iii$) The opening of the spiracles is regulated by sphincters.

($iv$) Exchange of gases take place at the tracheoles by diffusion.

$(i)$ They are commonly known as imperfect fungi because only the asexual or vegetative phases of these fungi are known.

$(ii)$ They grow in soil, on logs and tree stumps and

$(iii)$ Live inside plant bodies as parasites, e.g., rusts and smuts

$(iv)$ Some common members are Agaricus, Ustilago and Puccinia.