Plant Nutrition - Part 2 (T2) Flashcards Preview

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Flashcards in Plant Nutrition - Part 2 (T2) Deck (12):
1

Describe photosynthesis in three short points..

- converts carbon dioxide and water into glucose and oxygen
- requires light, which is absorbed by chlorophyll
- takes place in organelles called chloroplasts

2

From where do plants absorb the water and carbon dioxide needed for photosynthesis?

Plants absorb water through their roots and carbon dioxide through the stomata in their leaves.

3

What happened to the glucose and oxygen produced by photosynthesis?

- some glucose is used for respiration and some is converted to starch for storage.
- oxygen is released as a by-product.

4

What part of the plant carries out photosynthesis?

Any green part of a plant can photosynthesise but the main organ of photosynthesis is the leaf.

5

For photosynthesis to take place efficiently what five things are essential?

- a large surface area for absorption of light
- chloroplasts and chlorophyll
- water
- carbon dioxide
- a transport system

6

Briefly, how is a leaf adapted to carry out photosynthesis?

- thin and flat
- usually supported by a stalk which enables the leaf to be angled towards light
- contains layers of cells with specific functions to enable efficient photosynthesis

7

What is the chemical equation for photosynthesis?

6CO2 + 6H2O -> C6H12O6 + 6O2

8

Describe the three main factors that limit the rate of photosynthesis..

LIGHT INTENSITY
- photosynthesis decreases at low light levels and does not take place at all in the dark

CO2 CONCENTRATION
- a plant cannot photosynthesise if there is not enough CO2

TEMPERATURE
- if it gets too cold or hot, the rate of photosynthesis will decrease

9

Give two examples of how seasons affect plant growth..

- in winter, the lawn doesn't grow due to lack of light and heat
- in summer, the growth slows due to lack of rain

10

How can you overcome the limiting factors of photosynthesis?

- lights can be used to simulate daylight.
- heating a greenhouse, especially if gas or paraffin heaters are used as they produce carbon dioxide as a by-product.

11

What is produced by plants during photosynthesis as a waste product?

Oxygen

12

What is produced by plants during respiration as a waste product?

Carbon dioxide

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