Transport in Plants Worksheet 1 Answers

MCQs
1. d
The process by which substances move from a low to high concentration is called active transport, which requires energy.

2. d
Transport of water occurs through osmosis. For a well-watered plant, the soil surrounding the plant will have a higher water potential compared to the cell sap found in the cells of roots. Therefore, water moves into the cells through the partially permeable membrane by osmosis. The water potential of the outermost cell increases and is now higher compared to its neighbouring cell. Therefore water moves into the neighbouring cell through the partially permeable membrane by osmosis. The process continues as water moves from the outer layer of cells into the inner layer of cells until it reaches the xylem.

3. c
An organ is a structure made up of different tissues working together to perform a specific function (leaf, stomach).

4. b
When the amount of water absorbed is lower than the amount of water lost, plants cells loses their turgidity and becomes flaccid. This results in the 'crumpled' state of leaves, also known as wilting.

5. c
Transpiration is water loss from leaves of plants through evaporation of water.

6a. (labelling)

6b. Xylem - water and mineral salts, Phloem - sucrose

6c. Xylem tubes are long hollow tubes stretching from roots to leaves. The hollow tubes have empty lumens to allow the smooth slow of water and mineral salts. There are lignin deposits to thicken the walls of the xylem in order to prevent collapse of the vessel.