water uptake by roots Flashcards
Where are many root hairs found in a plant?
Many root hairs are found near the tip of small roots.
What are root hairs?
Root hairs are extensions of root epidermis cells and have thin walls that are not covered by a cuticle.
Describe root hairs
They have thin walls that are not covered by a cuticle.
What are the 3 adaptations of root hairs for better absorption?
Adaptations of root hairs for absorption:
Thin walls
Not covered by a cuticle
Very numerous, which provides a large surface area
The absorption of water into the root hairs takes place by what?
The absorption of water into root hairs takes place by osmosis
What are soil particles enclosed by?
Soil particles are enclosed by a layer of relatively pure water called capillary water
Where can capillary water be found?
on soil particles, enclosing them as a layer
What does the cytoplasm of root hairs contain?
The cytoplasm of root hairs contains many dissolved solutes.
Is the cytoplasm of root hairs more or less concentrated than the water in the soil?
the cytoplasm is more concentrated than the water in the soil,
What is a result of the cytoplasm of root hairs being more concentrated than the water in soil?
As a result, water enters the cytoplasm of the root hairs by osmosis.
How does water move from the root hair cells to the cells in the root?
Water diffuses from the root hair cells into cells in the root.
Water continues to diffuse from the root hair cells to the cells in the root and then continues on to where?
It continues to diffuse across the ground tissue until it reaches the xylem in the centre of the root
Does xylem or phloem transport water?
xylem
What does water have to diffuse through to get to the xylem tissue?
ground tissue
What is the path the water will take once it has diffused into the xylem?
Xylem vessels form a continuous hollow pipeline from the roots to all parts of the plant. In particular, water can flow in xylem from the roots, up through the stem, into the petiole and from there into the leaves..
