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 _________________.

Absorption of water from soil by dry seeds increases the _____________, thus helping seedlings to come out of soil

Water moves up against gravity and even for a tree of 20m height, the tip receives water within two hours. The most important physiological phenomenon which is responsible for the upward movement of water is _______________________.

The C4 plants are twice as efficient as C3 plants in terms of fixing CO2 but lose only _________ as much water as C3 plants for the same amount of CO2 fixed.

In a plant, translocation in xylem is unidirectional while in phloem it is bidirectional. Explain.