Bio topic 8

Phloem

transport of sucrose and amino acids to all parts of the plant

Xylem

Transports water and mineral salts and supports the plant

Transpiration

it is the exit of water in the form of water vapour through stomata

Root hair cell

to absorb water and dissolved mineral nutrients from the soil

explain pathway of water in plant

water moves through the soil to the rot hair by osmosis then to the cortex cells then to the root xylem then to the surface area of mesophyll cells in the leafs then heated up and leave out through stomata in the form of water vapour in the process called transpiration

How xylem is adapted to its function

•have lignified Walsh to support the plant and impermeable to water

•no cell structure on the inside

•have no walls end to end forming a continuous tube

•have pilots for lateral distribution of water

how root hair is adapted to its function

•large in number to increase surface area for absorption

•high concentrated sap vacuole for absorption of water from soil by osmosis

• A lot of mitochondria for energy production in case of active transport

Funtion of transpiration

it cools down the plant to transport water and minerals from the roots to the rest of the plant

Source

it is the part of the plant from which sucrose and amino acids are translocated

Sink

The part of the plant to which the food translocated

Translocation

is the movement of sucrose and amino acids in phloem from the region of production (source) to the region of utilisation in respiration (sink)

which to components does phloem transport

•amino acids

•sucrose