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Life Processes — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10ScienceLife Processes1 Mark
MCQ
The internal $($cellular$)$ energy reserve in autotrophs is :
  • A
    Glycogen.
  • B
    Protein.
  • ✓
    Starch.
  • D
    Fatty acid.
✓

Answer

Correct option: C.
Starch.
Autotrophs are the organisms that use light as source of energy, carbon dioxide as chief carbon source and water as electron donor to fix the atmospheric carbon dioxide into organic compounds $($carbohydrates$)$. The main photosynthetic pigment chlorophyll a and accessory pigments chl $b,$ chl $c$ and carotenoids etc trap the Sunlight to carry out the light reactions of photosynthesis. The light reaction of photosynthesis produces $\text{ATP}$ and reducing agents which in turn serve as energy source to drive the second phase of photosynthesis $($dark reactions$)$ during which carbohydrate synthesis takes place.
The carbohydrates which are not immediately consumed by plants are stored as starch $($homopolysaccharide of $D-$ glucose$).$
Glycogen serves as main stored form of carbohydrates in animals.

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