Plant tissues, organs and systems：練習問題

In a multicellular organism, cells differentiate to perform specific functions. Which of the following correctly identifies a plant tissue and its specific functional adaptation?

Which of the following correctly identifies a plant tissue and relates its structure to its specific transport function?

A scientist examines a cell that possesses a cell wall made of cellulose, a large permanent vacuole, and mitochondria, but it lacks chloroplasts. In which plant tissue is this cell most likely to be found?

Compare the structural and functional adaptations of xylem and phloem tissues in terms of the substances they transport and the direction of their movement within a flowering plant.

Plants possess specialized tissues for the transport of various substances. Compare xylem and phloem in terms of the specific substances they transport and the primary direction of movement for each substance within the plant.

A student investigates how guard cells control the rate of water loss in a plant.

a) Name the structure on the leaf surface that is surrounded by guard cells and state its role in gas exchange.
b) Explain the mechanism by which stomata close to prevent wilting during hot and dry conditions.
c) Describe two structural features of the leaf that help the plant to maximise the diffusion of carbon dioxide for photosynthesis.

Plants possess specialized tissues and organs that facilitate the transport of essential substances throughout their structure.

a) Contrast the structural function of the xylem and phloem tissues, identifying exactly what substance each transports and the direction of that transport.
b) The transpiration stream is the movement of water from the roots to the leaves. Describe two environmental conditions that would cause an increase in the rate of this movement and explain why the plant might respond by closing its stomata in these conditions.
c) Palisade mesophyll and spongy mesophyll are both tissues found in the leaf. Explain how the specific arrangement of cells in the spongy mesophyll tissue is adapted to support the function of the palisade mesophyll tissue.