What is the most suitable reason for a negative starch test in a green plant kept in darkness?
Answer and explanation
Correct answer: The plant did not make food without light
The governing concept is that green plants synthesize glucose by photosynthesis using light energy, carbon dioxide, and water; excess glucose is commonly stored as starch. When a plant is kept in darkness, the light-dependent stage cannot provide the required energy, so new food and starch formation become very limited or stop. Therefore option A is the best reason. Roots, oxygen uptake, and the absurd claim about blood do not explain the starch test.
Frequently asked questions
What is the correct answer to this question?
The plant did not make food without light
Why is this the correct answer?
The governing concept is that green plants synthesize glucose by photosynthesis using light energy, carbon dioxide, and water; excess glucose is commonly stored as starch. When a plant is kept in darkness, the light-dependent stage cannot provide the required energy, so new food and starch formation become very limited or stop. Therefore option A is the best reason. Roots, oxygen uptake, and the absurd claim about blood do not explain the starch test.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: World of Living. Topic: Life Processes.
Student feedback
Was this question useful?
👍 0 Helpful 👎 0 Not helpful
Yes 0% No 0%
0 responsesStudent Reviews
No published reviews yet.
