6- plant nutrition Flashcards Preview

Biology > 6- plant nutrition > Flashcards

Flashcards in 6- plant nutrition Deck (16)
Loading flashcards...
1

photosynthesis

The process by which plants make carbohydrates from
raw materials using light energy.

2

inorganic materials

water, CO2, minerals

3

organic materials

proteins, vitamins, carbohydrates, lipids

4

epidermis

one cell thick layer, has no chloroplast. It protects the inner cell layers of the leaf.

5

cuticle

waxy material on the upper epidermis, it helps to stop water evaporation.

6

palisade mesophyll

the cells are close to the top of the leaf, elongated, packed and contain chloroplasts to make photosynthesis.

7

spongy mesophyll

round cells, have chloroplast, quite loosely, with large air spaces between them to allow diffusion of gases and water vapor.

8

vascular bundle

[xylem & phloem], found in the mesophyll layer, have vessels to carry water & sucrose.

9

stomata

tiny holes found in the lower epidermis. They are surrounded by two guard cells that help to open &
close the stoma for gas exchange.

10

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
exchange.
7.Xylem vessels: to carry water to the leaf cells.
8.Phloem vessels: to carry sucrose away from
the leaf

11

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, .

12

whys is glucose converted into sucrose for transport

sucrose is less reactive and water soluble

13

function of nitrates/ ammonuim ions in plants

- make proteins
deficiency: weak growth, yellow leaves`

14

function of magnesuim ions in plants

- make chlorophyll
deficiency: yellowing between the veins of the leaves

15

limiting factors of plants

sunlight, CO2, temperature

16

adnvantages of growing crops in glasshouse

light intensity, carbon dioxide concentration and
temperature can be controlled, so plants can photosynthesize as fast as possible.