Question

name the 5 phenomenon that play a role in absorbtion and conduction of water and minerals​

Answer 1

All plants essentially require food, minerals and water. The transport system in plants is responsible for distribution of food, minerals and water to all part of the plant. Absorption refers to the absorption of water by the roots from the soil, through a process known as osmosis, which will be explained in detail later in this chapter. Vascular plants (the term vasculum is a Latin word meaning duct) have tissues known as xylem to conduct water and minerals throughout the plant.

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Answer 2

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There are multiple forms of passive transport namely:

Simple diffusion.

Facilitated diffusion.

Filtration.

Osmosis.

No energy is required for these movements.

Diffusion: Diffusion is the movement of molecules of liquids and gases from their region of higher concentration to their region of lower concentration until it is same throughout the given space.

Example: When perfume is spilt in one corner of a room its fragrance spreads all over the roo

Cell membranes are permeable to both CO2 and O2 so the two gases are able to diffuse freely.

Respiration occurs due to diffusion.

Diffusion allows the internal walls of the plant cells to remain moist.

It allows for transport of ions and small molecules through the cytoplasm.

Insects are attracted towards flowers because of diffusion of scent through the air.

Imbibition: Imbibition is a special type of diffusion where water absorbed by solids-colloids causes a tremendous increase in volume. Examples are the absorption of water by seeds and dry wood.

Causes the root hair to take up water in the soil due to a difference in the saturation levels of water.

Occurs only when solid plant materials like dry wood, dried seeds or grains come into contact with water.

Produces a lot of pressure e.g. a piece of dry wood can even break a rock when it has imbibed water.

During the rainy season, it is difficult to open or close wooden doors because they imbibe water.

A can full of soaked seeds can cause the can to burst open because of the pressure on the lid.

Grains imbibe water and crack when godowns are flooded with rain water.

Osmosis: Osmosis is the spontaneous net movement of water across a semipermeable membrane from a region of low solute concentration to a solution with a high solute concentration, down a solute concentration gradient.

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