Question

The internal cellular energy reserve in autotrophs is
A. Glycogen
B. Protein
C. Starch
D. Fatty acid

Answer 1

Hint: The food prepared by green plants are used to carry physiological functions of the plant and some of it is stored for future use.
This storage unit is a polymer containing several units of glucose molecules.in the form of certain molecules and stores it in the form of starch.

Complete answer: Autotrophs are essentially green plants that produce their own food by the process of photosynthesis.
1. The reserve food is stored in the form of starch molecules.
2. The excess glucose molecules produced during photosynthesis are joined by glycosidic linkage, forming a chain of monomer units (glucose).
3. Starch is stored in the stacked cell organelles namely, chloroplasts in the form of granules. 4. Some storage parts of plants include the tuber of the potato, the stem pith of sago, and the seeds of corn, wheat, and rice.
5. In the case of food shortage, these starch molecules are broken down, with enzymatic activity into its constituent monomer glucose units, which diffuse from the cell to nourish the plant tissues.

So, the correct answer is option C. Starch.

Note: Starch has a soft, white, powdery appearance.
1. It is water-insoluble.
2. The simplest form of starch is the linear polymer amylose whereas amylopectin is the extensively branched form of starch.
3. The glucose units are joined by α 1,4 linkages.