CH 8 Transport in Plants Worksheet 1 Answer | PDF | Stoma | Leaf - Free Printable

Problem Analysis and Solution

The worksheet provided is about plant nutrition, specifically focusing on water movement in plants. Let's solve the two questions step by step.

---

#### Question 1:
The diagram below shows a potted plant and the same plant 48 hours later. What has caused the plant’s appearance to change? Which process causes this change?

- Diagram Description: The plant appears wilted after 48 hours compared to its initial state.
- Key Concept: Plants lose water through a process called transpiration, where water evaporates from the leaves. If the rate of water loss (transpiration) exceeds the rate of water uptake by the roots, the plant will wilt.

Options:
1. A. Water loss by translocation is greater than water uptake
- Translocation refers to the movement of organic substances (e.g., sugars) within the plant, not water. This option is incorrect.
2. B. Water evaporating from the leaves by translocation
- Translocation is unrelated to water movement. This option is incorrect.
3. C. Water loss by transpiration is greater than water uptake
- Transpiration is the process by which water evaporates from the leaves. If the plant loses more water through transpiration than it absorbs through its roots, it will wilt. This is the correct explanation.
4. D. Water loss from the leaves by osmosis
- Osmosis is the movement of water across a semipermeable membrane, typically into or out of cells. While osmosis plays a role in water movement within the plant, it is not the primary cause of wilting due to excessive water loss. This option is incorrect.

Correct Answer: C. Water loss by transpiration is greater than water uptake

---

#### Question 2:
Which order below is correct in describing the pathway of water as it travels from the roots through a plant?

- Key Concept: Water enters the plant through the root hair cells, moves up the xylem (a type of vascular tissue), and reaches the mesophyll cells in the leaves. From there, it can evaporate through stomata into the air spaces.

Options:
1. A. Root hair cell → xylem → mesophyll cells → air space → stomata
- This option correctly describes the pathway:
- Water enters the root hair cells.
- It moves upward through the xylem.
- It reaches the mesophyll cells in the leaves.
- It evaporates into the air spaces.
- Finally, it exits through the stomata.
- This is the correct sequence.
2. B. Root hair cell → xylem → air spaces → mesophyll cells → stomata
- This option incorrectly suggests that water moves directly into the air spaces before reaching the mesophyll cells. This is incorrect.
3. C. Root hair cell → mesophyll cells → phloem → stomata
- Phloem is involved in transporting organic substances, not water. Additionally, water does not move directly from the root hair cells to the mesophyll cells without passing through the xylem. This is incorrect.
4. D. Root hair cell → cortex cells → mesophyll cells → xylem → stomata
- Cortex cells are part of the root structure, but water primarily moves through the xylem, not directly through the cortex cells to the mesophyll cells. This is incorrect.

Correct Answer: A. Root hair cell → xylem → mesophyll cells → air space → stomata

---

Final Answers:

1. C. Water loss by transpiration is greater than water uptake
2. A. Root hair cell → xylem → mesophyll cells → air space → stomata

Boxed Answers:
1. \boxed{C}
2. \boxed{A}