Nutrition in the flowering plants

How is temperature regulated in plants?

By increasing or decreasing transpiration

What are the functions of a leaf?

Photosynthesis Food storage Gas exchange Transpiration

How is the transpiration stream kept going in a plant?

Osmosis Root pressure transpiration

Name the two scientists who first described the upward movement of water in plants and what was the name of the theory?

Henry Dixon John Joly Cohesion-tension model of water transport in xylem tissue

Describe the Cohesion-tension model of water transport in xylem tissue (the upward movement of water in plants)

Root pressure pushes water in xylem Cohesion - Water molecules stick together due to hydrogen bonding Adhesion - water molecules stick to xylem vessels Transpiration which causes a tension or pull

How is transpiration controlled in plants?

waxy cutile on leaves action of stomata location of stomata

What is an example of a stem modification as a food storage organ

potato

What is an example of a leaf modification as a food storage organ

Onions

Name the part of a flower from which a fruit may develop

Ovary

What causes unequal concentrations of auxins in shoot?

Difference in light direction Gravity

Name the cells which control the opening and closing of stomata

Guard cells

What is the advantage to plants having most of their stomata on the underside of the leaves?

Reduce water loss by transpiration

Give a disadvantage to plants of a high rate of transpiration

Wilting

The cohesion-tension model of transport attemps to explain water movement in plants against a particular force. Name this force

Gravity

How could you tell a runner is a modified stem from external observation?

Buds Nodes Leaf

Name a type of modified stem that functions in food storage

Rhizome Corm Tuber

Describe the relationship between the rate of transpiration and the rate of water uptake during the day. Suggest a reason for this relationship

As the water uptake increases transpiration also increases High water intake makes more water available for transpiration

What is an advantage to plants to having most of their stomata on the underside of the leaves?

Reduces water loss by transpiration

What is a disadvantage of high transpiration rates?

Wilting