The newest 19 of 19 written questions. Open one to see it on the real paper.
Name the gas released by the aquatic plant.
See it on the paper →State the name of the tropic response shown by shoot A in Fig. 10.1.
See it on the paper →State the name of the response that causes plants to grow towards light.
See it on the paper →Calculate the rate of oxygen bubbles released when the lamp is placed 30 cm from the aquatic plant. bubbles / min
See it on the paper →Complete the sentences to describe and explain the results in Table 7.1. Decreasing the distance of the lamp from the aquatic plant the light intensity. Light energy is converted into energy in molecules. This transfer of energy is done by in the chloroplasts.
See it on the paper →State the name of this tropic response.
See it on the paper →State the name of the chemical that causes this tropic response.
See it on the paper →Calculate the mean number of oxygen bubbles released when the lamp is 30 cm from the aquatic plant. Give your answer to the nearest whole number. Write your answer in Table 4.1.
The majority of candidates gave the correct value. Occasionally the value of 62 bubbles per minute was given.
— Examiner report, February/March 2024, 0654/42 Q7(a)(i) (Cambridge)
This question was very well answered. A few candidates confused decreasing the distance of the lamp with decreasing light intensity. A minority of candidates described the products of photosynthesis as being carbon dioxide.
— Examiner report, February/March 2024, 0654/42 Q7(a)(ii) (Cambridge)
Almost all candidates were able to correctly calculate the mean. Only a handful failed to round to the nearest whole number.
— Examiner report, May/June 2023, 0654/41 Q4(d)(i) (Cambridge)
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Describe the effect of light intensity on the rate of photosynthesis using the data in Table 4.1.
See it on the paper →Which test-tube will contain the most dissolved oxygen after 24 hours?
See it on the paper →Plants in a forest will compete for light. Auxin is a hormone that is responsible for the chemical control of shoot growth. Complete the sentences to describe how auxin causes shoots to grow towards the light. Auxin is made in the shoot and moves and spreads through the plant. It collects on the side of the shoot. Auxi...
See it on the paper →Explain why the light intensity is kept constant during this investigation.
See it on the paper →Describe the response of the shoots and roots to gravity. Include the name of the response in your answer.
See it on the paper →Name one other stimulus that shoots and roots respond to.
See it on the paper →The aquatic plant releases bubbles of gas. Name the gas the bubbles are made from.
See it on the paper →The investigation was repeated with the filament lamp removed. Explain why the number of bubbles produced decreases.
See it on the paper →The advantages and disadvantages of artificial lighting for plant growth in controlled environments.
See it on the paper →The effect of different light intensities on the rate of photosynthesis.
See it on the paper →How temperature affects the rate of photosynthesis.
See it on the paper →