Consider the following statements regarding starch and sucrose synthesis of starch and sucrose synthesis during and selct the correct ones.
(i) Triose phosphate is confined to chloropast and is utilised for the synthesis of starch only.
(ii) Triose phosphate is translocated to cytosol from chloroplast.
(iii) Triose phosphate is utilised for the synthesis of both starch and sucrose.
(iv) Triose phosphate is translocated from cytosol to chloroplast.

Options

A. i and iii
B. ii and iii
C. ii and iv
D. iii and iv

Answer

B

Explanation

Glyceraldehyde-3-phosphate (G3P) or 3-jphos-phoglyceraldehyde (PGAL). Also known as triose phosphate, is a chemical compound that occurs as an intermediate in several central metabolic pathways of all organisms. It is an intermediate in photosynthesis. A part of triose phospharte is translocated to cytosol from chloroplast and is utilised for the syntehsis of glucse, sucrose, starch, itc. The reactions may be summarised as follows:

Fructose-1,6-bisphosphate+`H_(2)Ooverset("Phosphatase")rarr"Fructose-6-"Phosphate"+Pi` Fructose-6phosphate is then converted into other sugars (viz, glucose,sucrose, starch, etc.) depending upon plants need.