Which cell structure is involved in the process of formation of glucose during photosynthesis?

A plant is kept in the dark for two days to destarch its leaves. A leaf is then used in an experiment to investigate the effect of light and carbon dioxide on photosynthesis. Part $Q$ of the leaf is exposed to sunlight and air, while part $R$ is covered with black paper (blocking light). What are the colours of $Q$ and $R$ when the leaf is tested for starch using iodine solution?

While performing the experiment with raisins to determine the percentage of water absorbed by them, a student made the following measurements:
$(i)$ Mass of water in the beaker $= 40 \text{ g}$.
(ii) Mass of raisins before soaking $= 5 \text{ g}$.
(iii) Mass of raisins after soaking for $2 \text{ hours} = 8 \text{ g}$.
(iv) Mass of water left in the beaker after the experiment $= 35 \text{ g}$.
The percentage of water absorbed by raisins is:

Define "Parasite". Name two saprophytes and two parasites.

How do autotrophs obtain $CO_{2}$ and $N_{2}$ to make their food?

Why do carnivores have a shorter small intestine?