Q. 75.0( 1 Vote )
The plant cell cytoplasm is surrounded by both cell wall and cell membrane. The specificity of transport of substances are mostly across the cell membrane, because _________________.
The specificity of transport of substances are mostly across the cell membrane because the cell membrane is selectively permeable and allows only transport of certain substances through the cell (usually small, non-polar, uncharged molecules)
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Halophytes may show cell pressure very much higher than atmospheric pressure. Explain how this can happen?Biology - Exemplar
Define Uniport, Symport and Antiport. Do they require energy?
I) Uniport: When a single substance moves in a single direction across a cell membrane, it is called uniport.
II) Antiport: When two substances move in the opposite direction across a cell membrane, it is called antiport.
III) Symport: When two substances move in the same direction across a cell membrane, it is called symport.
Biology - Exemplar
Comment on the experimental setup
a. What does the setup demonstrate?
b. What will happen to the level of water if a blower is placed close to setup.
c. Will the mercury level fluctuate (go up/down) if phenyl mercuric acetate is sprayed on leaves?
Biology - Exemplar
Why are natural membranes selectively permeable. Give examples.Biology - Exemplar
The radio labelled carbon in carbon dioxide supplied to potato plants in an experiment was seen in the tuber eventually. Trace the movement of the labelled carbon dioxide.Biology - Exemplar
Plants show temporary and permanent wilting. Differentiate between the two. Do any of them indicate the water status of the soil?Biology - Exemplar
Minerals are present in the soil in sufficient amounts. Do plants need to adjust the types of solutes that reach the xylem? Which molecules help to adjust this? How do plants regulate the type and quantity of solutes that reach xylem?Biology - Exemplar
How is facilitated diffusion different from diffusion?Biology - Exemplar
We know that plants are harmed by excess water. But plants survive under flooded condition. How are they able to manage excess water?Biology - Exemplar