Unit 1: AOS 2, DP 3 Flashcards
1
Q
Water makes up
A
90-95% of living tissues of plants by weight
2
Q
water is involved in
A
- Input for photosynthesis
- Solvent for minerals transported in the xylem tissue and for sugars transported in phloem tissue
- Aqueous medium for all biochemical reactions
- Cooling plants by evaporation of water from leaves during transpiration
- Source of turgor pressure, maintains plant cell shape
3
Q
water in = water out
A
WATER IN (BY ROOTS) = WATER OUT (AT LEAVES)
4
Q
Roots sense…
A
and actively move towards moist patches of soil
5
Q
Root hairs
A
outgrowths of epidermal cells on root tips, sites of water absorption by roots
6
Q
Major loss of water =
A
water vapour is lost by transpiration from leaf and stomata
7
Q
Plants actively regulate water loss by
A
opening and closing of stomata
8
Q
Water loss occurs when
A
guard cells are turgid, (guard cells lose turgor, stomata close, preventing water loss)
9
Q
Osmosis adjustment =
A
regulate water loss
