Topic E- Respiration And Photosynthesis Flashcards
What is the word equation for anaerobic respiration in animals?
Glucose →lactic acid + ( energy)
What is the word equation for aerobic respiration?
Glucose+oxygen→ carbon dioxide+water+( energy)
What is the balanced chemical equation for photosynthesis?
6CO2+ 6H2O ( sunlight + chlorophyll) → C6H12O6+6O2
How can varying the temperature affect the rate of photosynthesis?
If it gets too cold, the rate of photosynthesis will decrease. Plants cannot photosynthesise if it gets too hot.
Why do plant need mineral ions?
For Growth
What is the purpose of stomata?
To allows sufficient CO2 to enter the leaf to optimize photosynthesis, while conserving as much water as possible.
What is photosynthesis?
The process is the chemical change which happens in the leaves of green plants. During the reaction carbon dioxide and water are converted into glucose and oxygen. The reaction requires light energy, which is absorbed by a green substance called chlorophyll.
Why do plants need nitrate ions?
For amino acids
How can varying carbon dioxide concentration affect the rate of photosynthesis?
Even when there is plenty of light, a plant can not photosynthesis if there is insufficient carbon dioxide
What’s the word equation for photosynthesis?
Carbon dioxide+ water (light energy+ chlorophyll) →glucose+ oxygen
What is aerobic respiration?
Aerobic respiration requires oxygen. It happens in cells when glucose reacts with oxygen.
Describe a way to work out the rate of photosynthesis
Collecting the volume of oxygen gas from a plant
How is the structure of the leaf adapted for gas exchange?
Adaption: Internal air spaces in spongy mesophyll layer
Purpose: Increases surface area of leaf to absorb more carbon dioxide
Adaption: Guard cells around stomata
Purpose: Allows the size of stomata to be adjusted ( eg they close the stomata to prevent wilting)
What is the symbol equation for aerobic respiration?
C6H12O6+6O2 →6CO2+ 6H2O+ energy
Explain gas exchange in a leaf in relation to respiration and photosynthesis
CO2 and O2 diffuse in and out of leaves through stomata. CO2 is used in photosynthesis and produces in respiration, whereas O2 is used in respiration and produced in photosynthesis
What is anaerobic respiration?
Anaerobic respiration does not need oxygen. It happens when there is not enough oxygen for aerobic respiration. Much less energy is released than by aerobic respiration.
How can varying light intensity affect the rate of photosynthesis?
Without light plant cannot photosynthesise very quickly, even when there is plenty of water and carbon dioxide. Increasing the light intensity will boost the speed of photosynthesis.
What’s respiration?
A process in living organisms involving the production of energy, typically with the intake of oxygen and the release of carbon dioxide
Where does photosynthesis take place?
In the leaf cells. These contain chloroplast, which are tiny objects containing chlorophyll.
Why do plants need magnesium ions?
For chlorophyll
What is the word equation for anaerobic respiration in plants?
Glucose →ethanol+carbon dioxide+ ( energy released)
Describe the iodine test
We use iodine solution to test for starch, which plants produce by photosynthesis
Positive: you quickly get dark purple, black color if you mix iodine solution and starch
Negative: a yellow, orange or brown colour means there is no starch
How is a leaf adapted for photosynthesis? Give an adaption and purpose.
Large surface area: to absorb more light
Thin: short distance for carbon dioxide to defuse in leaf cells
Chlorophyll: absorbs sunlight to transfer energy into chemicals
Network of veins: to support the leaf and transport carbohydrates
Stomata: allow carbon dioxide to defuse into the leaf
