6.1. Photosynthesis
A subsection of Biology, 0610, through 6. Plant nutrition
Listing 10 of 307 questions
The apparatus shown in was used to investigate the effects of different conditions on the rate of photosynthesis in an aquatic plant. oxygen water funnel aquatic plant A student investigated the effects of light and carbon dioxide on the rate of photosynthesis. The number of bubbles of oxygen produced in one minute was counted in four different conditions. Table 2.1 shows the results. Table 2.1 test conditions number of bubbles of oxygen per minute light carbon dioxide source added to the water present no absent no present yes absent yes State two conclusions about the conditions needed for photosynthesis using the information in Table 2.1. The investigation was carried out at 15 °C. It was repeated at 25 °C. Suggest and explain the effect this had on the results of test 2 and test 3. test 2 test 3 Carbon dioxide enters plant cells by diffusion. The word diffusion on the left can be joined to two boxes on the right to make two correct statements about diffusion. Draw two straight lines from diffusion to the boxes to complete the two statements. Diffusion involves a genetic change. is the movement of particles from high concentration to low concentration. is the movement of particles from low concentration to high concentration. occurs due to the random movement of particles. only occurs in plant cells. requires a partially permeable membrane. requires energy.
0610_w18_qp_31
THEORY
2018
Paper 3, Variant 1
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Plants carry out photosynthesis. State the names of two substances produced by photosynthesis. A student investigated how temperature affects the rate of photosynthesis. The concentration of carbon dioxide was kept constant during the investigation. The results are shown in . temperature rate of photosynthesis Predict how the rate of photosynthesis will change when carbon dioxide concentration increases and the temperature is kept constant at 20 °C. State one factor other than temperature and carbon dioxide concentration that will affect the rate of photosynthesis. In another investigation students used a plant which had variegated leaves. One of the leaves from this plant is shown in . B green: chloroplasts present A white: chloroplasts absent Complete Table 8.1 to show where the processes of photosynthesis and respiration occurred in this variegated leaf when the plant was in the light. Place a tick (3) in each correct box. Table 8.1 process area A area B photosynthesis respiration Cells in the mesophyll layers of a leaf carry out photosynthesis. State the names of two leaf layers that light must pass through to reach the spongy mesophyll cells. Plants absorb mineral ions from the soil. State the name of the tissue that transports mineral ions in plants. State the name of the mineral ion that is used to make chlorophyll. State the name of the mineral ion that is used to make amino acids. Plants are involved in nutrient cycles in ecosystems. Describe the role of plants in the carbon cycle and the water cycle.
0610_w20_qp_32
THEORY
2020
Paper 3, Variant 2
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Questions Discovered
307