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B2: Quiz 18 – Answers
B2: Quiz 18 – Answers
1) Diffusion is the net movement of particles (or molecules) from an area of high concentration to an area of low concentration
Or, diffusion is the net movement of particles (or molecules) down a concentration gradient
2)
a) Transpiration is the loss of water from a plant through the stomata by evaporation and diffusion
b) From the roots to the shoots
c) Stomata/ stoma
3)
4) Any 2 from:
Or, diffusion is the net movement of particles (or molecules) down a concentration gradient
2)
a) Transpiration is the loss of water from a plant through the stomata by evaporation and diffusion
b) From the roots to the shoots
c) Stomata/ stoma
3)
- stomata (or stoma)
- guard cells
4) Any 2 from:
- The leaves are supplied with water for photosynthesis
- Mineral ions are taken up with the water – the mineral ions are required for healthy growth & development of the plant
- Transpiration keeps the plant cool
- Transpiration maintains the turgid pressure in plant cells, which means that the leaves and stems of the plant are upright and firm – this allows the plant to receive sufficient sunlight, thus meaning that it can photosynthesis effectively
Questions
1) Give a definition of diffusion.
2)
a) Give a definition of transpiration.
b) Does the water in transpiration go from the roots to the shoots, or from the shoots to the roots?
c) What is the name for the part of the leaf where water leaves the leaf?
3) The diagram below shows the bottom of a leaf.
1) Give a definition of diffusion.
2)
a) Give a definition of transpiration.
b) Does the water in transpiration go from the roots to the shoots, or from the shoots to the roots?
c) What is the name for the part of the leaf where water leaves the leaf?
3) The diagram below shows the bottom of a leaf.
Give the names for the two labels (1 and 2) on the above diagram.
4) Give 2 benefits to the plant from transpiration.
4) Give 2 benefits to the plant from transpiration.