the site of photosynthesis in the cells of a leaf is ?

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Solution

Photosynthesis occurs inside the chloroplast of mesophyll cells. In photosynthesis, light reactions occur in the membranes of thylakoids. Whereas dark reaction occurs in the stroma of chloroplasts.

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Mesophyll cells in a leaf are the principal center for photosynthesis.

Q. In the experiment to demonstrate that starch is made as food by the process of photosynthesis, the plucked leaf is first boiled in water for about 3 to 5 minutes in order to :

(1) remove chlorophyll from leaf cells

(2) break down the cell membranes of leaf cells

(3) soften the brittle leaf

(4) convert starch into glucose so that is can be tested easily

Photosynthesis in green plants is directly and indirectly dependent on so many plant structures. Explain briefly the role of the following structures in this process.

(a) Guard cells ................................

(b) Cuticle ....................................

(d) Xylem tissue in the leaf veins ................

(e) Phloem tissue in the leaf veins .............

(f) Stomata........................................

Fill in the blanks with the appropriate answer from the choices given in the brackets.

(a) The site of light reaction in the cells of a leaf is ........................ (cytoplasm, stroma, grana).

(b) The chemical substance used to test the presence of starch in the cell of a leaf is ........................ (CaCl_2, iodine solution, Benedict solution).

(d) The dark reaction of photosynthesis is known as .............. (Hill reaction, cyclic phosphorylation, Calvin cycle).

(e) In flowering plants, food is transported in the form of ........................... (sucrose, glucose, starch).

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