Transport of Substances in Plants worksheet - Free Printable
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Step-by-step solution for: Transport of Substances in Plants worksheet
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Show Answer Key & Explanations
Step-by-step solution for: Transport of Substances in Plants worksheet
Let's solve each question step by step and provide explanations for the answers.
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Question 6: What substance is transported by phloem in the plants?
- Options:
a. water and minerals
b. water and food
c. food
Explanation:
Phloem is responsible for transporting organic substances (such as sugars, amino acids, and other nutrients) produced during photosynthesis from the leaves to other parts of the plant. These substances are collectively referred to as "food." Water and minerals are transported by xylem, not phloem.
Answer: c. food
---
Question 7: What substances are transported by xylem in the plants?
- Options:
a. water and oxygen
b. water and minerals
c. food and minerals
Explanation:
Xylem is responsible for transporting water and dissolved minerals (such as nitrogen, phosphorus, potassium, etc.) from the roots to the rest of the plant. Food (organic substances) is transported by phloem, not xylem.
Answer: b. water and minerals
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Question 8: Plants absorb water from the soil by _______.
- Options:
a. active transport
b. osmosis
c. diffusion
Explanation:
Water moves into plant roots primarily through osmosis. Osmosis is the movement of water molecules from an area of lower solute concentration to an area of higher solute concentration across a semipermeable membrane. In this case, the root cells have a higher solute concentration than the surrounding soil solution, causing water to move into the roots.
Answer: b. osmosis
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Question 9: Plants absorb minerals from the soil by _______.
- Options:
a. active transport
b. diffusion
c. osmosis
Explanation:
Minerals are absorbed by plant roots through active transport. Active transport requires energy (ATP) and involves specialized carrier proteins that move ions against their concentration gradient. This process ensures that plants can absorb essential minerals even when their concentration in the soil is low.
Answer: a. active transport
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Question 10: What process causes stomata to open?
- Options:
a. active transport
b. photosynthesis
c. osmosis
Explanation:
Stomata open due to osmosis. When the guard cells surrounding the stomata take up water by osmosis, they swell and become turgid, causing the stomatal pore to open. This allows gases (CO₂ for photosynthesis and O₂ for respiration) to enter or exit the leaf.
Answer: c. osmosis
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Question 11: By what process does food move from the leaves to different parts of the plants?
- Options:
a. diffusion
b. osmosis
c. active transport
Explanation:
Food (organic substances like sugars) moves from the leaves to other parts of the plant through active transport in the phloem. This process requires energy (ATP) and involves specialized mechanisms to move these substances against their concentration gradients.
Answer: c. active transport
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Question 12: Why do stomata open at daytime and close at nighttime?
- Options:
a. Because the plants do not need water at night.
b. Because plants sleep at night.
c. Because there is no light at night.
d. To protect the plants from cold at night.
Explanation:
Stomata open during the day to allow CO₂ uptake for photosynthesis and close at night to reduce water loss through transpiration. Since photosynthesis occurs only in the presence of light, stomata do not need to remain open at night. Additionally, closing stomata helps conserve water when photosynthesis is not occurring.
Answer: c. Because there is no light at night.
---
Final Answers:
1. c. food
2. b. water and minerals
3. b. osmosis
4. a. active transport
5. c. osmosis
6. c. active transport
7. c. Because there is no light at night.
Boxed Final Answer:
\[
\boxed{c, b, b, a, c, c, c}
\]
---
Question 6: What substance is transported by phloem in the plants?
- Options:
a. water and minerals
b. water and food
c. food
Explanation:
Phloem is responsible for transporting organic substances (such as sugars, amino acids, and other nutrients) produced during photosynthesis from the leaves to other parts of the plant. These substances are collectively referred to as "food." Water and minerals are transported by xylem, not phloem.
Answer: c. food
---
Question 7: What substances are transported by xylem in the plants?
- Options:
a. water and oxygen
b. water and minerals
c. food and minerals
Explanation:
Xylem is responsible for transporting water and dissolved minerals (such as nitrogen, phosphorus, potassium, etc.) from the roots to the rest of the plant. Food (organic substances) is transported by phloem, not xylem.
Answer: b. water and minerals
---
Question 8: Plants absorb water from the soil by _______.
- Options:
a. active transport
b. osmosis
c. diffusion
Explanation:
Water moves into plant roots primarily through osmosis. Osmosis is the movement of water molecules from an area of lower solute concentration to an area of higher solute concentration across a semipermeable membrane. In this case, the root cells have a higher solute concentration than the surrounding soil solution, causing water to move into the roots.
Answer: b. osmosis
---
Question 9: Plants absorb minerals from the soil by _______.
- Options:
a. active transport
b. diffusion
c. osmosis
Explanation:
Minerals are absorbed by plant roots through active transport. Active transport requires energy (ATP) and involves specialized carrier proteins that move ions against their concentration gradient. This process ensures that plants can absorb essential minerals even when their concentration in the soil is low.
Answer: a. active transport
---
Question 10: What process causes stomata to open?
- Options:
a. active transport
b. photosynthesis
c. osmosis
Explanation:
Stomata open due to osmosis. When the guard cells surrounding the stomata take up water by osmosis, they swell and become turgid, causing the stomatal pore to open. This allows gases (CO₂ for photosynthesis and O₂ for respiration) to enter or exit the leaf.
Answer: c. osmosis
---
Question 11: By what process does food move from the leaves to different parts of the plants?
- Options:
a. diffusion
b. osmosis
c. active transport
Explanation:
Food (organic substances like sugars) moves from the leaves to other parts of the plant through active transport in the phloem. This process requires energy (ATP) and involves specialized mechanisms to move these substances against their concentration gradients.
Answer: c. active transport
---
Question 12: Why do stomata open at daytime and close at nighttime?
- Options:
a. Because the plants do not need water at night.
b. Because plants sleep at night.
c. Because there is no light at night.
d. To protect the plants from cold at night.
Explanation:
Stomata open during the day to allow CO₂ uptake for photosynthesis and close at night to reduce water loss through transpiration. Since photosynthesis occurs only in the presence of light, stomata do not need to remain open at night. Additionally, closing stomata helps conserve water when photosynthesis is not occurring.
Answer: c. Because there is no light at night.
---
Final Answers:
1. c. food
2. b. water and minerals
3. b. osmosis
4. a. active transport
5. c. osmosis
6. c. active transport
7. c. Because there is no light at night.
Boxed Final Answer:
\[
\boxed{c, b, b, a, c, c, c}
\]
Parent Tip: Review the logic above to help your child master the concept of transport in plants worksheet answers.
