xylem

Question 1

what does xylem tissue transport

Answer 1

water and mineral ions

Question 2

how does cohesion and tension help water move up plants

Answer 2

1. water evaporates from the leaves at the top of the xylem.
2. this creates tension, which pulls more water into the leaf.
3. water molecules are cohesive so when some are pulled into the leaf others follow. this means the whole column of water in the xylem, from the leaves down to the roots, moves upwards.
4. water enters the stem through the roots.

Question 3

transpiration definition

Answer 3

the evaporation of water from a plant’s surface

Question 4

how does light affect transpiration rate

Answer 4

the lighter it is, the higher the transpiration rate. this is because the stomata open when it gets light to let in carbon dioxide for photosynthesis

Question 5

how does temperature affect transpiration rate

Answer 5

the higher the temperature, the higher the transpiration rate. warmer water molecules have more energy so they evaporate from the cells inside the leaf faster. this increases the concentration gradient between the inside and outside of the leaf, making water diffuse out of the leaf faster

Question 6

how does humidity affect transpiration rate

Answer 6

the lower the humidity, the higher the transpiration rate. if air around the plant is dry, the concentration gradient between the leaf and air increased, which increases transpiration

Question 7

how does wind affect transpiration rate

Answer 7

the windier it is, the higher the transpiration rate. lots of air movement blows away water molecules from around the stomata, increasing the concentration gradient and increases the transpiration rate