homework flashcards photosynthesis

Question 1

what is the word equation for photosynthesis?

Answer 1

water + carbon dioxide –light–> glucose + oxygen

Question 2

design an experiment to investigate how light intensity affects photosynthesis?

Answer 2

C hange - distance of lamp from pondweed (light intensity)
O rganism - Pondweed, same species, same number of leaves, same size
R epeat - x3 for each distance (0cm, 10cm, 20cm, 30cm, 40cm)
M easure - number of bubbles per minute (rate of photosynthesis)
S ame - same lamp, same temperature, same conentration of glucose

Question 3

where does photosynthesis take place in a plant cell?

Answer 3

chloroplasts (chlorophyll)

Question 4

what is the chemical equation for photosynthesis

Answer 4

6CO(2) + 6H(2)O –light energy–> 6O(2) + C(6)H(12)O(6)

Question 5

how is the leaf adapted for gas exchange?

Answer 5

• long and thin for a larger surface area so more light can be absorbed, more stomata so more carbon dioxide can be absorbed, and a shorter diffusion distance
• stomata allow gasses to diffuse into/out of the leaf therefore provides a short diffusion distance
• upper epidermis is transparent so it allows light through to the mesophyll layer
• the palisade cells are long, thin, and tightly packed together, and have many chloroplasts so that it can absorb the max amount of light energy. they are the main site of photosynthesis
• xylem transports water to the leaves for a short diffusion distance
• phloem transports sugars produced in the leaf around the plant