問BIO 2001 CE MC Q.32 and Q.48

Q.32

Answer:C

Immersed in concentrated sucrose solution ,the leaf experiences a lower water potential outside the leaf cells than that inside .Water in the cell is drawn out by osmosis .Therefore ,the cell would shrink and the cell membrane be detached from the cell wall ,which is called plasmolysis .The cell would become flaccid .

(A,B) Water has a higher water potential than the cytoplasm .Water will diffuse into the cell through osmosis .The cell will expand and become turgid .Exposing the leaf to sunlight causes its stomata to open ,and water uptake by the leaf would be increased by transpiration .

(D)Higher temperature of boiling water damage the cell membrane ,and plasmolysis would not occur.


Q.48

Answer:B

Plant Y produces food ; it is the producer .Plant X feeds on plant Y ;
it becomes the primary consumer .
The insects feed on plant X ; they are secondary consumers.


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