Exam 36: Resource Acquisition and Transport in Vascular Plants

Phloem transport is described as being from source to sink.Which of the following would most accurately complete this statement about phloem transport as applied to most plants in the late spring? Phloem transports ________ from the ________ source to the ________ sink.

Assume that a particular chemical interferes with the establishment and maintenance of proton gradients across the membranes of plant cells.All of the following processes would be directly affected by this chemical except

Which one of the following statements about transport of nutrients in phloem is false?

The value for Ψ in root tissue was found to be -0.15 MPa.If you take the root tissue and place it in a 0.1 M solution of sucrose (Ψ = -0.23 MPa),the net water flow would

Plasmodesmata can change in number,and when dilated can provide a passageway for

Plants and animals can be said to have similar needs,because both require water,food,and minerals for growth and survival.In plants,water enters the root through root hairs and then moves through the root cortex into the vascular tissue and into the shoots.The endodermis,with Casparian strips in the endodermal cells,controls entry into the vascular cylinder. -Plant diversity is very high in the tropics,but plants are found in the many different biomes and show specific adaptations to cold,hot,wet,and dry environments.You are working in a greenhouse and have just received a large shipment of desert plants.Which feature/characteristic would you not find in your desert plants?

The water lost during transpiration is a side effect of the plant's exchange of gases.However,the plant derives some benefit from this water loss in the form of

In the pressure-flow mechanism,loading of sucrose from companion cells to sieve-tube elements takes place through

When an animal cell is placed in a hypotonic solution and water enters the cell via osmosis,the volume of the cell increases until it bursts.This does not happen to plant cells,because

Compared to a cell with few aquaporins in its membrane,a cell containing many aquaporins will

Several tomato plants are growing in a small garden plot.If soil water potential were to drop significantly on a hot summer afternoon,which of the following would most likely occur?

What is the advantage of having small,needlelike leaves?

Loss of water from the aerial parts of plants is called

If you were to prune the shoot tips of a plant,what would be the effect on the plant and the leaf area index?

One would expect to find the highest density of aquaporins in which of the following?

Which structure or compartment is not part of the plant's apoplast?

What would you predict would happen to this plant if the stomata failed to close?

Stomata open when

If isolated plant cells with a water potential averaging -0.5 MPa are placed into a solution with a water potential of -0.3 MPa,which of the following would be the most likely outcome?

The movement of water across biological membranes can best be predicted by