Photosynthesis Flashcards
Why are plants known as autotrophs?
because the prepare their own food.
What does photosynthesis mean?
It literally means synthesis in the presence of light.
Define photosynthesis.
Photosynthesis is the process of preparing food using carbon dioxide and water in the presence of light.
Where does photosynthesis mostly occur?Does it occur anywhere else?
- In the leaves
- Yes, it may occur in the stem in some cases.
What do leaves contain?Where is “it” present?
- Chlorophyll in its cells.
- “It” is present in an organelle known as the chloroplasts.
Wht are the 2 main important roles of a leaf in photosynthesis?
- On the lower sides of the leaves, there are small pores, called the stomamta , which let the carbon dioxide enter.
- It consists of chlorophyll-containing cells.
Why is chlorophyll necessary?
Because it traps the energy from sunlight, without photosynthesis, chlorophyll does not take place.
What are the raw materials in photosynthesis?
- Carbon Dioxide- Is absorbed from the atmosphere through the stomamta , which is present on the lower surface of the leaf.
- Water-Absorbed fromthe soil through the root system.
- Chlorophyll-Present in the leaf.
- Light- from the Sun.
What is synthesised during photosynthesis?
Food , in the form of sugars, is synthesised and oxygen is realeased as a byproduct.
What is regarded as evidence of photosynthesis?
Presence of starch, a complex carbohydrate,.
What is the summary of photosynthesis?
Carbon dioxide+water———— carbohydrates, oxygen and water.
What are leaves of green plants described as?
chemical factories for producing food.
Leaves convert light energy to ________ by____________
chemical energy by synthesising carbohydrates.
How does a cactus produce photosynthesis?
Since the leaves are reduced to spines, it takes place in the stem.
What is a stomata?
Stomata are minute pores in the surface of a leave, they are abundant in the lower surface of the leaf, so as to control the rate of transpiration.
What is the structure of a stomata?
The stomata has an opening called the stomatal opening and is surrounded by 2 kidney - shaped beans called the guard cells, these cells contain chlorophyll and photosynthesis takes place here, guard cells are further surrounded by susudairy cells.
Define stomatal apparatus.
The whole structure of the stomatal opening,guard cells, and the subsidairy cells is known as stomatal appararus.
What is the role of the stomata?
Exchange of gases in ( oxygen and carbon dioxide) takes place in the stomamta. It is wide open in the day time as photosynthesis takes place in the light then and it is closed at night as photsynthesis doe not take place in the dark.
What are the factors affecting light intensity , describe each.
- Light intensity
- Availability of carbon dioxide
- Availability of water
- Temperature
- Chlorophyll
- Inorhanic mineral ions.
DESCRIING PART IS NOT GIVEN BUT PPLEASE DESCRIBE ANYWAY.
How much % of a dehydrated plant is made up of carbon,hydrogen,oxygen and nitrogen?
96%
