B8 Photosynthesis Flashcards
What process means that plants can make food as they don’t need to eat?
Photosynthesis.
Where is photosynthesis carried out?
Photosynthesis takes place in the green parts of plants (especially the leaves) when it is light. Algae can also carry out photosynthesis.
What do all organisms, including plant and algae, need food for?
Respiration, growth and reproduction.
What are the cells in algae and plant leaves full of?
These are full of small green parts called chloroplasts , which contain a green substance called chlorophyll.
During photosynthesis, how is energy transferred from the environment to the chloroplasts?
This energy is then transferred to convert carbon dioxide from the air, plus water from the soil into a simple sugar called…
What does this chemical reaction also produce as a by-product?
What do we use the product for?
By light. ........................... Glucose. ........................... Oxygen gas. ........................... As oxygen is released into the air we use it when we breathe it in.
What is the formula for photosynthesis?
carbon dioxide + water = (light) = glucose + oxygen
Photosynthesis is an example of what kind of reaction? Why?
Endothermic reaction. It needs an input of energy from the environment.
Photosynthesis produces a lot of glucose.
What is it used for?
Some of the glucose is used immediately by the cells of the plant for respiration. However a lot of the glucose is converted into insoluble starch and stored.
Algae are aquatic which means that they can…
Photosynthesize in water.
What may affect the rate of photosynthesis?
The rate of photosynthesis may be affected by light intensity, temperature, level of carbon dioxide and the amount of chlorophyll.
What do plants and algal cells use the glucose produced during photosynthesis for?
Respiration, to convert into insoluble starch for storage, to produce fats or oils for storage, to produce cellulose to strengthen cell walls, and to produce amino acids for protein synthesis.
What do plants and algal cells also need to make the amino acids used to make proteins?
Nitrate ions absorbed from the soil or water.
