Biology for IGCSE & O level - Transport In Plants (Section 6)
1
What type of cells make up the phloem tissue and facilitate translocation?
2
What is a 'source' in the context of translocation?
Answer(C)
An area where sugars are made.
3
Which of the following is NOT directly involved in the process of water uptake by the roots?
4
Which cells in a leaf are primarily responsible for regulating the opening and closing of the stomata?
5
What is the name of the openings on the leaf surface that allow for gas exchange and transpiration?
6
What is the role of adhesion in the xylem?
Answer(B)
Helps water molecules stick to the xylem walls.
7
What is the name of the waxy coating on the surface of the leaves?
8
What is the direction of sugar transport in the phloem?
9
What are the components that help to create a transpiration stream?
10
What is the effect of humidity on the rate of transpiration?
Answer(C)
Higher humidity decreases transpiration.
11
What is the primary driving force behind the movement of water in the xylem from the roots to the leaves?
12
Which plant process contributes to the transpiration pull?
13
What is the primary function of the cuticle on a leaf?
14
In the process of water uptake, what creates the water potential gradient that drives water movement into the roots?
Answer(B)
The active transport of mineral ions into the root cells
15
What is the importance of root hairs in the plant's ability to absorb water?
Answer(C)
To increase the surface area for absorption
16
Aphids are used in experiments to study translocation. How do aphids contribute to the understanding of phloem transport?
Answer(B)
Their stylets can be used to extract phloem sap and analyze its content.
17
What is the name of the cells that surround the xylem and phloem and form the vascular bundles in plants?
18
How does light intensity influence the rate of transpiration?
Answer(B)
Increased light intensity increases transpiration.
