Flashcards in 6- plant nutrition Deck (16)
The process by which plants make carbohydrates from
raw materials using light energy.
water, CO2, minerals
proteins, vitamins, carbohydrates, lipids
one cell thick layer, has no chloroplast. It protects the inner cell layers of the leaf.
waxy material on the upper epidermis, it helps to stop water evaporation.
the cells are close to the top of the leaf, elongated, packed and contain chloroplasts to make photosynthesis.
round cells, have chloroplast, quite loosely, with large air spaces between them to allow diffusion of gases and water vapor.
[xylem & phloem], found in the mesophyll layer, have vessels to carry water & sucrose.
tiny holes found in the lower epidermis. They are surrounded by two guard cells that help to open &
close the stoma for gas exchange.
leaf adaptation for photosynthesis
1.Leaf is wide, to expose large surface area to
sunlight and air.
2.Leaf is thin, so faster diffusion for gases into
and out of the leaf.
3.Epidermis has no chloroplast, to allow sunlight
to reach mesophyll layer.
4.Palisade cells arranged end to end to trap
more sunlight for more photosynthesis.
5.Air spaces in spongy mesophyll, to allow gases
to diffuse in & out of the cells.
6.Stomata in lower epidermis: to allow gas
7.Xylem vessels: to carry water to the leaf cells.
8.Phloem vessels: to carry sucrose away from
uses of glucose
1. energy, as it is broken down by respiration.
2. Stored as starch, in the leaf, roots and seeds.
3. Used to make proteins & other organic substances.
4. Converted to sucrose to be transported in the plant, .
whys is glucose converted into sucrose for transport
sucrose is less reactive and water soluble
function of nitrates/ ammonuim ions in plants
- make proteins
deficiency: weak growth, yellow leaves`
function of magnesuim ions in plants
- make chlorophyll
deficiency: yellowing between the veins of the leaves
limiting factors of plants
sunlight, CO2, temperature