Carbohydrates are commonly, found as starch in plant storage organs. Which of the following five properties of starch (A-E)
Carbohydrates are commonly, found as starch in plant storage organs. Which of the following five properties of starch (A-E) make it useful as a storage material?
A. Easily translocated
B. Chemically non-reactive
C. Easily digested by animals
D. Osmotically inactive
E. Synthesised during photosynthesis
The useful properties are
(a) B and C
(b) B and D
(c) A, C and E
(d) A and E
1 Answers
Correct option (c) A, C and E
Explanation :
Option (c) is correct As starch is a high molecular weight polymer of D-glucose in α 1 → 4 linkage. It ts synthesised in chloroplasts as one of the stable end products of photosynthesis. It is most abundant and common storage polysaccharide in plants hence, most staple food for man and herbivores.
It is a mixture of two types of glucose homopolysaccharide viz, amylose and amylopectin. During day time the starch synthesis in chloroplast is coordinated with sucrose synthesis in cytosol. Typically about 90% of total solute carried in phloem is the carbohydrate sucrose, a disaccharide.
This ls relatively inactive and highly solubl: sugar playing little direct role in metabolism find so, making an ideal transport sugar.