core questions Flashcards
What are chloroplasts
organelles in a plant cell that contain chlorophyll and are the site of respiration.
What is photosynthesis
A a chemical reaction in which plants produce glucose and oxygen from carbon dioxide and water
Where does the energy needed for photosynthesis come from
Light
what is the word equation for photosynthesis
carbon dioxide +water—>glucose +oxygen
What is the role of chlorophyll
To absorb light energy
What type of cell contains lots of chloroplast
Palisade cells
Why are palisade cells found near the top of leaves
so they can absorb as much sunlight as possible for photosynthesis
what is the purpose of the waxy cuticle
prevents water loss
why are leaves green
They are filled with chlorophyll which is a green pigment
what are stomata
small holes on the underside of the leaf that through carbon dioxide can enter and water and oxygen can leave
why do leaves have a large surface area
To absorb as much sunlight as possible
What do plants do with the glucose produced by photosynthesis
1.use it for respiration
2.store it as starch
3.Use it to make cell walls
What is the name of the chemical added to a leaf in order to test for starch
Iodine solution
What colour change would you expect to see from Iodine if starch is present
Brown to blue-Black
What is respiration
A chemical reaction that releases energy from glucose
Where does respiration take place in a cell
mitochondria
What is the word equation for aerobic respiration
Glucose+Oxygen - Carbon dioxide +water (energy)
What does the word aerobic mean
With oxygen
What is the word equation for anaerobic respiration in animals
Glucose - lactic acids
What is the word equation for anaerobic respiration in plants and yeast
Glucose–Ethanol+ Carbon dioxide
What is the process in which yeast respire anaerobically to produce alcohol
Fermentation
What happens to your heart rate when you exercise
it increases
Why do your heart rate and breathing rate increase when you excercise
To provide ore oxygen and glucose to the muscle to increase to amount of respiration.
What happens if not enough oxygen is recieved by muscles during excercise
They will respire anaerobically releasing lactic acids that will cause muscle fatigue
What is the independant variable on a graph
x - axis
what is the dependant variable on graph
y-axis
