PART - 1 - Unit III : CH - 9 Biomolecules — BIOLOGY STD 11 Science — Question

$(I)$ Humidity in atmosphere is relatively more in the area where light become limiting factor for plants

$(II)$ Increase in light as factor affecting photosynthesis beyond a point causes breakdown of chlorophyll and a decrease in photosynthesis occurs

$(III)$ The $C_4$ plants respond to higher temperatures and show higher rates of photosynthesis while $C_3$ plants have a much lower temperature optimum

$(i)$ Contractile vacuole takes part in osmoregulation and excretion.

$(ii)$ Food vacuole is formed by engulfing the food particles.

$(iii)$ The vacuole is bound by a double membrane called tonoplast.

$(iv)$ Vacuole can occupy upto $90$ percent of the volume of the cell.

 $\begin{array}{|l|l|} \hline Column\,\,-I & Column\,\,-II  \\ \hline (a)\,\,Fibula & (1)\,\,Fore\,\,limb \\ \hline (b)\,\,Pubis & (2)\,\,Face \\ \hline (c)\,\,Radius & (3)\,\,Hind\,\,limb \\ \hline (d)\,\,Lacrymal & (4)\,\,Pelvic\,\,girdle \\ \hline (e)\,\,Temporal\,\,bones & (5)\,\,Cranium \\ \hline \end{array}$