What substance is mixed with food in the mouth during chewing by the teeth?

What are biochemical catalysts called?

Given below is the experimental set-up to establish that one of the atmospheric gases is essential for photosynthesis in plants. $(a)$ Name the atmospheric gas which is essential for photosynthesis. $(b)$ What is kept in the watch-glass in figure 'a' and why? $(c)$ Write the balanced chemical equation for the process of photosynthesis. $(d)$ When do the desert plants take up carbon dioxide and perform photosynthesis?

State the chemical equation for photosynthesis and identify the site where it occurs in plant cells.

What is the mode of nutrition in fungi?

How are fats digested in our bodies? Where does this process take place?