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Organisms and Energy Requirements

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Questions and Answers

What is the purpose of keeping the plant in a dark room for three days before exposing it to sunlight in the photosynthesis experiment?

To ensure all starch in the leaf gets utilized (correct)
To prepare the plant for the conversion of light energy to chemical energy
To speed up the reduction of carbon dioxide to carbohydrates
To enhance the absorption of light energy by chlorophyll

Why is it essential to boil the leaf in alcohol during the photosynthesis experiment?

To decolorize the leaf and prepare it for iodine staining
To remove any impurities from the leaf cells
To extract the chlorophyll from the leaf (correct)
To break down starch into simpler carbohydrates

What is the main role of chloroplasts in photosynthesis?

Produce heat to facilitate chemical reactions
Convert light energy into chemical energy (correct)
Store excess water for later use
Absorb oxygen for respiration

Why is it mentioned that desert plants take up carbon dioxide at night in preparation for photosynthesis?

To utilize stored energy efficiently for photosynthesis (B) Signup and view all the answers

How does boiling the leaf in a dilute solution of iodine help determine the presence of starch?

It turns the leaf blue if starch is present (D) Signup and view all the answers

What is the primary function of enzymes in organisms?

To break down complex substances into simpler ones (A) Signup and view all the answers

Which organisms are classified as autotrophs?

Green plants and some bacteria (B) Signup and view all the answers

What process fulfills the carbon and energy requirements of autotrophic organisms?

Photosynthesis (C) Signup and view all the answers

What is the function of starch in plants?

To store excess carbohydrates (D) Signup and view all the answers

How does the energy derived from food storage differ between autotrophs and heterotrophs?

Autotrophs store energy as starch, while heterotrophs store energy as glycogen (B) Signup and view all the answers

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