The process by which plants use carbon dioxide, water and light trapped by chlorophyll to make food in the form of glucose, with oxygen being given off during the process.
When does photosynthesis take place?
Photosynthesis took place when there is presence of carbon dioxide, water, sunlight and chlorophyll.
Sunlight (light energy)
- Light energy is converted to chemical energy stored in glucose.
- This green pigment absorbs light energy and changes it into chemical energy needed to manufacture glucose.
Carbon dioxide and water
- These are the raw materials needed to form carbohydrates (glucose).
- Photosynthesis depends on the reactions of enzymes in the chloroplasts. Enzyme reactions are fastest at a suitable temperature.
Where does photosynthesis take place?
Photosynthesis took place in the chloroplasts which can be found in cytoplasm of a leaf cell, it has disc‐like structures and contain the green pigments chlorophyll which traps sunlight for photosynthesis, chlorophyll also makes the plant green in colour.
How does photosynthesis take place?
The chlorophyll inside the plant cell will absorb the light, mostly the red and blue light, the green light will usually be reflected or transmitted.
When light energy is absorbed by chlorophyll and transformed into chemical energy. The chemical energy is then used in the synthesis of glucose from carbon dioxide and water. And oxygen is produced during the process.
Carbon dioxide is taken into the plant through the stomata.
carbon dioxide was diffused and taken in through the stomata, excess oxygen leaves the plant also through stomata by diffusion.
Water was taken in through the root of the plant, it travel up the plant through the xylem tube and was carried to every part of the plant.
Respiration took place all the time as all living cells need energy to carry out many vital processes all the time.
There are several kinds of respiration that scientist had discovered:
- Cellular Respiration
- Tissue Respiration
- External Respiration
- Aerobic Respiration
- Growth (building up of proteins)
- Muscle contractions (e.g. heartbeats)
- Digestion and absorption of food substances
- Cell division
Human respiratory system
- nasal cavity
- Air enters through two external nostrils. The nostrils lead into two nasal passages which are lined with a moist mucous membrane.
- The air in your nasal passages enters the pharynx. From the pharynx, air passes into your larynx and then into your trachea.
The lower end of the trachea divides into two tubes/bronchi. Each bronchus (plural: bronchi) connects to one lung.Each bronchus divides continually and ends in bronchioles. Each bronchiole ends in a cluster of air sacs or alveoli (singular: alveolus).Thousands of alveoli are found in lungs, and these alveoli provide a very large surface area for gaseous exchange.Gaseous exchange is possible because alveoli are well‐supplied with blood capillaries.