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B2 topic 6: Plant structure and functions > Photosynthesis > Flashcards

Flashcards in Photosynthesis Deck (22)
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1

Is photosynthesis exothermic or endothermic?

Endothermic

2

Which types of organism carry out photosynthesis?

plants and algae

3

What is the word equation for photosynthesis?

carbon dioxide + water -> oxygen + glucose

4

Which type of energy is needed for photosynthesis?

light

5

Where does photosynthesis take place?

chlorophyll inside chloroplasts

6

How does increasing temperature affect rate of photosynthesis?

As temperature increases, rate of photosynthesis increases. At high temperatures, rate of photosythesis decreases to zero.

7

Why does increasing temperature affect rate of photosynthesis?

Increasing temperature increases rate of photosynthesis because particles gain energy and are more likely to collide and react. At high temperatures, the enzymes involved in photosynthesis denature, meaning it cannot happen.

8

How does increasing light intensity affect rate of photosynthesis?

Increasing light intensity causes rate of photosynthesis to increase. Eventually rate of photosynthesis reaches a maximum and does not increase anymore.

9

Why does increasing light intensity affect rate of photosynthesis?

Light energy is needed for photosynthesis so increasing the level of light energy increases the rate. Eventually where there is a very high light intensity, the chlorophyll is absorbing as much as it can, so increasing further will have no effect.

10

How does carbon dioxide concentration affect rate of photosynthesis?

As carbon dioxide concentration increases, rate of photosynthesis increases. At high concentrations of carbon dioxide, increasing the concentration has no effect on the rate of photosynthesis

11

Why does increasing carbon dioxide concentration affect rate of photosynthesis?

Carbon dioxide is a reactant of photosynthesis so increasing concentration makes a reaction more likely. At high concentrations, the maximum of carbon dioxide which can react at one time is reacting, so increasing concentration further will have no effect.

12

What is a limiting factor?

A factor which, when in short supply, reduces the rate of photosynthesis

13

How are root hair cells adapted for photosynthesis?

Large projections increase surface area to volume ratio, meaning more water can be absorbed. No chloroplasts. Mitochondria for active transport.

14

What is osmosis?

Movement of water molecules from an area of high concentration to an area of low concentration through a partially permeable membrane.

15

What is diffusion?

Movement of particles from an area of high concentration from an area of low concentration down a concentration gradient.

16

What is active transport?

Movement of particles from an area of low concentration to an area of high concentration. Energy is required

17

Which organelles are found in plant cells but not animal cells?

cell wall, chloroplasts, vacuole

18

Why are leaves thin?

shorter distance for gases to diffuse

19

Why do leaves have a waxy cuticle?

To waterproof and protect the leaf

20

Where in theleaf does photosynthesis take place?

mesophyll cells near the top of the leaf

21

Suggest an adaptation of mesophyll cells

Lots of chloroplasts for photosynthesis. Cells close together to maximise space for photosynthesis

22

You are investigating how changing light intensity affects rate of photosynthesis in pond weed. Suggest 2 control variables.

The species/ mass of pondweed used. The concentration of carbon dioxide in the water. The temperature of the water