02 Photosynthesis and respiration Flashcards
1
Q
Where do plants get most of their “stuff” to make wood (and food)?
A
The air (carbon dioxide)
2
Q
What is light?
A
- Radiant energy
- Light is composed of photons
- the particle that represents a form of energy
3
Q
Van Helmont’s experiments on plant growth
A
- Weighed potted plants and soil before and after plant growth
- Concludes that plants don’t grow from feeding on soil
4
Q
Ingenhousz’s photosynthesis experiment
A
- Put leaves under water in sealed bottles
- Exposed to light
- Concludes that oxygen released from plants in the presence of light during photosynthesis
5
Q
Test for oxygen
A
- A glowing splint
- Forms a flame
- In the presence of oxygen
6
Q
Julius Sachs photosynthesis experiments
A
- Used a starch test on leaves
- Fount that starch was present in leaves exposed to sunlight
- Concludes that starch is produced by leaves after photosynthesis
7
Q
Where does photosynthesis take place?
A
In the chloroplasts of plant cells
8
Q
The green pigment required for photosynthesis in plants
A
Chlorophyll
9
Q
The way carbon dioxide enters leaves
A
- Tiny pores on the leaves
- Called stomata
- They can open and close according to the plants needs
10
Q
The importance of photosynthesis
A
- Energy to sustain life.
- Energy in an ecosystem is linked to food, because energy is stored in food compounds inside plants and animals.
- Without photosynthesis, there would be no beginning to the food chain
11
Q
Chemical reactants for photosynthesis
A
- Carbon dioxide
- Water
12
Q
Physical requirements for photosynthesis
A
- Sunlight (radiant energy)
- Chloroplasts
13
Q
Chemical products of photosynthesis
A
- Oxygen
- Glucose (stored as starch)
14
Q
Word equation for photosynthesis
A
15
Q
Main steps to test a leaf for starch
A
- Squash the leaf
- Boil in water
- Double boil in alcohol
- Rinse the leaf
- Test the leaf for starch
