Photosythesis Flashcards
What is the word and symbol equation for photosynthesis?
Carbon dioxide + water –> glucose + oxygen
6CO2 + 6H2O –> C6H12O6 + 6O2
–> is light/ chlorophyll
Which organisms use photosynthesis?
Green plants or algae
How does light effect photosynthesis?
Light transfers the energy needed for photosynthesis, increasing the light intensity increases the rate of photosynthesis but they can only go up to a certain point, it shows that light isn’t the limiting factor. Either temperature or co2 is the limiting factor.
How does carbon dioxide effect photosynthesis?
Increasing the co2 concentration increases the rate of photosynthesis but they can only go up to a certain point, it shows that co2 isn’t the limiting factor. As long as light and co2 are plentiful it is temperature.
How does temperature effect photosynthesis?
Usually temperature is the limiting factor. Because when it is too low the enzymes needed for photosynthesis to work more slowly but if it gets too hot the enzymes in the plant denature. This happens at about 45 degrees.
How do root hairs take in minerals and water?
The cells on the surface of plant roots grow into “hairs” which stick to the soil. Each branch will be covered in millions of these microscopic hairs giving the plant a large surface area. The concentration is usually higher in the root hair cells around them so they are absorbed by active transport. Water is absorbed by osmosis.
How does the phloem tube transport food?
They are made out of elongated living cells with small pores in the end walls to allow stuff to flow through. They transport food substances (mainly sucrose) made in the leaves to the rest of the plant for immediate use or for storage. This is called translocation and it requires energy from respiration. It goes both directions.
How does the xylem tubes transport water?
Xylem tubes are made out of dead cells joined end to end with no end walls, they’re strengthened with a mineral called lignin. They carry water and mineral ions from the roots to the stem and leaf. This movement is called transpiration.
What is transpiration?
Transpiration is caused by evaporation and diffusion of water from plants surface. The loss of light creates a slight shortage of water so water is drawn up from the rest of the plants ore water is drawn up through the xylem vessels, this means more water is drawn up through the roots and there’s a constants stream of transpiration. this carries,mineral ions which lie with the water acre sold today.
Why is the stomata needed?
It is needed for gas exchange, stomata is roping pores on the surface of a plant. They are mostly found on the lower surface of leaves. The stomata allows carbon dioxide and oxygen to diffuse directly in and out of a leaf. They also allow water vapour to escape transpiration. Stomata is surrounded by guard cells, they change shape to control the size of the pore.
How is transpiration rate affected by environmental factors?
Light intensity-> the brighter the light, the grater the transpiration as photosynthesis can’t happen in the dark.
Temperature-> the warmer it is, the faster transpiration happens as it evaporates quicker.
Air flow-> the better the air flow, the greater the transpiration as the water vapour needs to be swept away to allow a low concentration.
How can you estimate transpiration?
You use a special device called a potometer. It measures the water uptake by a plant, we assume its water uptake is directly related to water loss.
What is the inverse square law?
Light intensity is inversely proportional to distance squared.
