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Biology

Photosynthesis (Section 3)

QuestionAnswer
Plants are autotrophs. What does that mean? They can make complex molecules (glucose) from simple molecules (carbon dioxide and water)
What is the word equation for photosynthesis? carbon dioxide + water ----> glucose + oxygen
What is the chemical equation for photosynthesis? 6CO2 + 6H20 ------> C6H12O6 + 6O2
Photosynthesis converts ________ energy to _________ energy light, chemical
What 3 main factors limit the rate of photosynthesis? 1. Light intensity 2. Temperature 3. Carbon dioxide concentration
Where does photosynthesis take place? In the chloroplasts
What pigment in chloroplasts absorbs sunlight? Chlorophyll
What are 3 causes of a decreased amount of chlorophyll in a plant? 1. Diseases 2. Lack of nutrients 3. Loss of leaves
Name 3 adaptations a plant has for photosynthesis 1. Large surface area - for CO2 and light 2. Thin - for CO2 diffusion 3. Transparent epidermis - allows more light to reach palisade cells
What does the waxy cuticle do in a leaf? Prevents water from evaporating
Is photosynthesis and endothermic or exothermic reaction? Endothermic (it requires energy from the sun)
What are 5 of the main uses of glucose in plants? 1. To make cellulose 2. To make starch 3. To make amino acids 4. To make lipids 5. For cellular respiration
What is a limiting factor? Anything that stops photosynthesis happening any faster
Why do plants store carbohydrates as starch rather than glucose? Starch is insoluble, so does not diffuse out of cells
When testing for starch in a leaf, why do we dunk the leaf in boiling water? To stop any chemical reactions from happening
When testing for starch in a leaf, why do we place the leaf in a boiling tube and heat it with ethanol? To get rid of any chlorophyll
After removing a leaf from ethanol, what colour will it be? Colourless
Explain a safety precaution when testing a leaf for starch Use a water bath instead of Bunsen Burner to heat ethanol, as it is highly flammable
Created by: JoeMather
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