Chapter 2 - Organisms In The Environment Flashcards
(4705 cards)
What is diffusion?
Movement of particles from a high concentration to a low concentration
Why would you place a quadrat at regular intervals in a line rather than at random positions anywhere?
- to get accurate data of the change of position of the organism
- to get an accurate relation to distance from the sea
How can you improve an investigation to make sure your data is valid?2
Repeat several times
In another place
Why is it good to be able to float up when the sea covers the plant?
So that the plant can get more light
So that more photosynthesis can occur
Why don’t leaves produce oxygen in the dark?
Because there is no light so photosynthesis can’t occur
How can you make sure that heat doesn’t affect the rate of photosynthesis in an experiment? 2
Use a low energy bulb
Use LED
Give three factors that affect the rate of photosynthesis?
Light intensity
Carbon dioxide
Temperature
How should you decide where to put quadrats in an investigation? 2 with eg
Choose random places
By using a method of obtaining randomness eg a grid and random numbers
What factors could affect the distribution of plants?5
Nutrients Minerals Ions Water Fertiliser
Between 25-35 degrees why would the rate of oxygen production increase?
- the particles move faster
- more collisions
Or - particles have more energy
Why would the oxygen production between 40-50 degrees go down?
The enzymes would be denatured
Why shouldn’t a greenhouse be heated to more than 35 degrees? 3
- the rate of growth decreases
- so less profit is made
- less than 35 degrees the respiration rate is higher
How is glucose used in a plant?6
- joined together to form starch
- nitrate jobs and other minerals
- to form protein
- fats and oils
- used in respiration
- builds cellulose
What is the function of fats and oils in a plant?
- build cell membranes
- energy store
What is the function of cellulose in plants?
For cell walls
What is the function of starch in a plant?
For storage
What are the functions of proteins in plants?
To grow
How do plants obtain nitrate ions?
Absorbed from the soil or surrounding water
What does a plant use nitrate ions for?3
They convert them
into amino acids
to form proteins
to grow
How does light intensity affect the rate of photosynthesis?
increasing light increases photosynthesis until another factor becomes a limiting one
How does carbon dioxide concentration affect the rate of photosynthesis?
It allows photosynthesis to take place faster until another factor becomes the limiting one
How does temperature affect the rate of photosynthesis?& why
As photosynthesis requires enzymes for the reaction providing more heat energy increases the rate of reaction
Why is glucose converted into starch for storage?3
Glucose can’t be used as a storage molecule for energy
Because it is soluble
so it affects the movement of water in the cell
Word equation for photosynthesis?
Carbon dioxide + water = glucose + oxygen