Chapter 9 Transport in Plants - Worksheet | Download Free PDF ... - Free Printable

Problem Analysis:

The worksheet is from a Secondary 3 Biology class and focuses on the topic of Transport in Plants. The tasks involve completing a passage, identifying processes involved in transport, and matching terms with descriptions. Below, I will solve each part step by step.

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Section 9.1: Complete the following passage by filling in the blanks

#### Passage:
- The vascular tissues of flowering plants are xylem and phloem, which transport materials. Xylem transports water and minerals from the root to the other parts of the plant. The lignified cell walls of the xylem vessels provide support for the plant. Phloem transports organic nutrient materials such as sugars and amino acids from the leaves to other parts of the plant.

#### Explanation:
1. Vascular Tissues: Plants have two main types of vascular tissues: xylem and phloem.
- Xylem: Transports water and minerals (inorganic substances) upward from the roots to the leaves and other parts of the plant.
- Phloem: Transports organic nutrients (such as sugars) produced during photosynthesis from the leaves to other parts of the plant.
2. Support: The xylem vessels have lignified cell walls, which provide structural support to the plant.
3. Nutrients: Phloem transports organic materials like sugars and amino acids, which are essential for growth and energy.

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Section 9.2: Use the terms U to Z to answer questions (a) to (d)

#### Terms:
- U: Transpirational pull
- V: Capillary action
- W: Osmosis
- X: Diffusion
- Y: Active transport
- Z: Root pressure

#### Questions:

(a) What forces are involved in the conduction of water and ions up the xylem vessels?
- Answer: U (Transpirational pull), Z (Root pressure)
- Explanation: Water moves upward through the xylem due to transpirational pull (caused by evaporation of water from the leaves) and root pressure (generated by osmosis in the roots).

(b) Name the possible processes by which ions enter root hairs.
- Answer: W (Osmosis), Y (Active transport)
- Explanation:
- Osmosis: Ions can move into root hairs via osmosis if the concentration of solutes is higher inside the root cells than in the soil solution.
- Active transport: Some ions require energy (ATP) to be transported against their concentration gradient, which is facilitated by active transport.

(c) How does water vapour pass out of the leaves into the surrounding air?
- Answer: X (Diffusion)
- Explanation: Water vapor exits the leaf through stomata by diffusion, moving from an area of high concentration (inside the leaf) to an area of low concentration (outside the leaf).

(d) How does water enter root hairs?
- Answer: W (Osmosis)
- Explanation: Water enters root hairs by osmosis. The root cells have a higher solute concentration than the soil solution, creating a water potential gradient that drives water into the root cells.

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Section 9.3: Match the following terms with its associated description

This section is not fully visible in the image provided. However, based on the context of the worksheet, the terms would likely match as follows:
- Transpirational pull: The force created by water loss from leaves, pulling water up the xylem.
- Capillary action: The movement of water up narrow tubes or spaces due to surface tension and cohesion.
- Osmosis: The movement of water across a semipermeable membrane from an area of lower solute concentration to higher solute concentration.
- Diffusion: The movement of molecules from an area of higher concentration to lower concentration.
- Active transport: The movement of substances across a membrane using energy (ATP).
- Root pressure: The pressure generated by osmosis in the roots, pushing water upward.

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Final Answer Summary:

1. Section 9.1:
- The vascular tissues of flowering plants are xylem and phloem, which transport materials. Xylem transports water and minerals from the root to the other parts of the plant. The lignified cell walls of the xylem vessels provide support for the plant. Phloem transports organic nutrient materials such as sugars and amino acids from the leaves to other parts of the plant.

2. Section 9.2:
- (a) U (Transpirational pull), Z (Root pressure)
- (b) W (Osmosis), Y (Active transport)
- (c) X (Diffusion)
- (d) W (Osmosis)

3. Section 9.3: Matching terms with descriptions (not fully visible in the image).

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Final Boxed Answer:

\[
\boxed{
\text{(a) U, Z; (b) W, Y; (c) X; (d) W}
}
\]