Transport In Plants

Front 1

Define osmosis

Back 1

Osmosis is the net movement of water from a high concentration of water to a low concentration across a semi permeable membrane.

Front 2

Outline the difference between diffusion and osmosis

Back 2

Osmosis is always the movement of water and takes place across a semi permeable memebrane.

Front 3

Describe the similarities between difusion and osmosis

Back 3

They both move along a concentration gradient from a high to a low. They are both passive processes.

Front 4

Describe how a palasade is adapted to its function

Back 4

Regular shape = stacked together to absorb maximum light.
Many choloroplasts for photosynthesis

Front 5

Describe how a mesophyl cell is adapted to its function

Back 5

irregular shape allows gases to diffuse between them.
each cell is in contact with alot of air, so water can evaporate from them

Front 6

Descibe the function of the xylem vessel

Back 6

To tranport water and dissovled mineral ions from the root to the leaf.

Front 7

name 2 mineral ions which need to be transported to the leaf

Back 7

Magnesium for production of chorophyl and nitrates for growth.

Front 8

Describe the function of the phloem

Back 8

To take an organic compound from its source to its sink.

Front 9

What is an organic compound

Back 9

an organic compound is a molecule that contains carbon and hydrogen and may contain other elements

Front 10

name some examples of organic compounds

Back 10

carbohydrates(CHO)
fats(CHO)
proteins(CHONS)

Front 11

Define source and sink with reference to the phloem tube

Back 11

Palisade= source
Sink = Shoot/bud, the root cell, storage organ eg: potato,flower,fruit

Front 12

Explain the reason why sucrose is transported in the phloem instead of glucose

Back 12

Sucrose creates less of an osmotic pull than glucose

Front 13

Explain why sucrose might not be found in a root cell

Back 13

Because it might have been broken down into glucose and used for respiration or built up to starch and stored.

Front 14

Descibe the difference in structure between the xylem vessel and the phloem tube

Back 14

Xylem vessels have thicker walls, they have lignin in their walls, they have a wider lumen without a cytoplasm and no cross walls

Front 15

Describe the phloem tube

Back 15

Cells aranged end to end.
Next to each cell there is a companion cell that hold the nucleus and the mitochondria for the phloem cell

Front 16

Descibe sieve end plates

Back 16

Their found at the end of phloem cells, they assist the passage of assimilates through the plant