Let's go through each of the
True or False questions about
photosynthesis in plants, and provide the correct answer with a clear explanation.
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1. Photosynthesis takes place only in the leaves of the plants.
-
Answer: b. false
✔ Explanation:
While
leaves are the main site of photosynthesis due to their high concentration of chlorophyll and large surface area,
photosynthesis can also occur in other green parts of the plant such as stems (e.g., in cacti), young shoots, and even green fruits. Any part of the plant that contains
chlorophyll can perform photosynthesis.
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2. Green plants produce their own food.
-
Answer: a. true
✔ Explanation:
Green plants are
autotrophs, meaning they can make their own food using sunlight, carbon dioxide, and water through the process of
photosynthesis. They convert these raw materials into glucose (a type of sugar), which serves as food for the plant.
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3. Artificial light can be used by the plants to produce food through photosynthesis.
-
Answer: a. true
✔ Explanation:
Plants use
light energy to carry out photosynthesis. While natural sunlight is ideal,
artificial light (such as LED grow lights) can also provide the necessary wavelengths (especially red and blue light) to drive photosynthesis. This is commonly used in indoor gardening and greenhouses.
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4. Carbon dioxide is a product of photosynthesis that is needed by animals.
-
Answer: b. false
✔ Explanation:
This statement is
incorrect because:
-
Carbon dioxide (CO₂) is an
input (raw material) for photosynthesis, not a product.
- The
products of photosynthesis are
glucose and
oxygen.
- Animals
do need CO₂? Actually, no — animals
release CO₂ as a waste product during respiration. They
need oxygen, not CO₂.
So, the statement is false because:
- CO₂ is
not a product of photosynthesis.
- Animals do
not need CO₂ — they
produce it.
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5. Green plants help reduce carbon dioxide in the atmosphere.
-
Answer: a. true
✔ Explanation:
During photosynthesis, plants absorb
carbon dioxide (CO₂) from the air. This helps
lower the amount of CO₂ in the atmosphere, which is beneficial in reducing the greenhouse effect and combating climate change. So yes, plants play a vital role in
carbon sequestration.
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6. Oxygen produced by trees is the cause of global warming.
-
Answer: b. false
✔ Explanation:
Oxygen (O₂) is
not a greenhouse gas and does
not contribute to global warming. In fact,
oxygen is essential for life and is a
byproduct of photosynthesis.
The
main causes of global warming are greenhouse gases like
carbon dioxide (CO₂), methane (CH₄), and nitrous oxide (N₂O), which trap heat in the atmosphere.
So, this statement is
false — oxygen is
not the cause of global warming.
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7. To store excess glucose, it is transformed into starch and stored in different parts of the plant.
-
Answer: a. true
✔ Explanation:
Glucose is the immediate product of photosynthesis, but it is
water-soluble and can’t be stored easily. So, plants
convert excess glucose into starch, which is insoluble and can be stored in roots, stems, and seeds (e.g., potatoes, carrots). Starch is broken down later when the plant needs energy.
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✔ Final Answers:
1.
b. false
2.
a. true
3.
a. true
4.
b. false
5.
a. true
6.
b. false
7.
a. true
Let me know if you'd like this turned into a printable worksheet or need additional explanations!
Parent Tip: Review the logic above to help your child master the concept of photosynthesis worksheet 7th grade.
