Plant Transport and Physiology

Hydrilla is an aquatic plant. Function of roots is to fix the plant in the soil and to absorb water from the soil. Both these requirements get reduced in aquatic plants. So, hydrilla has got poorly-developed roots. Its function is to hold the plant in its place against the water currents.

Capillary action is the process that plants use to pull water up from the ground. 

Leaves are the physical platform for the process of photosynthesis. Leaves function to capture carbon dioxide and sunlight to produce carbohydrates (sugar, starch and cellulose [or wood]), while minimizing water loss.

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Xylem is the vascular tissue in plants that transports water and dissolved minerals from the roots to the leaves through a process called transpiration. The option 'both (1) and (2)' correctly identifies that xylem carries both water (option 1) and minerals (option 2).

Plants have two main transport systems: xylem (which transports water and minerals upward from roots to leaves) and phloem (which transports food/sugar downward from leaves to other parts). These are the vascular tissues that form the plant's circulatory system.

Root hairs absorb both water and mineral nutrients from soil through their large surface area. They actively take up ions via membrane transport proteins.

Transpiration pulls water up xylem vessels, creating negative pressure (tension) at the top. This reduced pressure draws water upward from roots through the transpiration-cohesion-tension mechanism.

Water enters root hairs primarily through osmosis, moving from higher water potential in soil to lower water potential in root cells. This passive transport drives water uptake.

Transpiration is the biological process where water evaporates from the leaves of plants, primarily through stomata. This creates a transpiration pull that helps draw water and minerals up from the roots. Transport refers to general movement, respiration is the release of energy from glucose, and 'all the above' is incorrect because only transpiration fits the definition.

Stomata are the tiny pores found primarily on the undersides of leaves. They open and close to regulate gas exchange (CO2 intake, O2 release) and water vapor loss. Pits are depressions in cell walls, spores are reproductive cells, and holes is too generic a term.

Translocation is the specific term for the transport of organic food materials (mainly sugars) from the leaves (where they're produced by photosynthesis) to other parts of the plant. Transpiration refers specifically to water loss, transport is too general, and photosynthesis is the sugar production process, not its transport.

Plasma membrane regulates the passage of water and dissolved substances into and out of the cell.

Respiration is the biochemical process of gas exchange in organisms - taking in oxygen and releasing carbon dioxide. Assimilation is absorbing nutrients, stomata are pores on leaves, and transpiration is water loss through leaves.

If we keep a leaf of bryophyllum on damp soil, within a day or two,  buds appear from the margin of leaf.