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Biology Paper 2
01.1 · 1 mark Mutation concept definition What is a mutation? 01.2 · 3 marks Natural selection process Describe the process of natural selection. 01.3 · 1 mark Natural selection scientists Which scientists suggested the theory of evolution by natural selection? Tick (✓) one box. 01.4 · 3 marks Hoverfly warning-marking survival Explain how having yellow and black markings helps the hoverfly survive. 02.1 · 3 marks Peat bog decay conditions Explain why most of the dead remains of plants in layer B do not decay. 02.2 · 1 mark Biomass transfer estimation The peat bog in Figure 2 is a stable community. The moss produces biomass at a rate of 340 g/m²/year. What is the approximate... 02.3 · 1 mark Phosphate roles in plant biosynthesis What substance can the sundew plant make using the phosphates? Tick (✓) one box. 02.4 · 1 mark Nitrogen roles in plant biosynthesis What substance can the sundew plant make using the nitrogen? Tick (✓) one box. 02.5 · 4 marks Peat use and atmospheric temperature Explain how the destruction of peat bogs and the use of peat affects the temperature of the Earth's atmosphere. 03.1 · 1 mark Tadpole sampling method improvement Suggest one improvement to the method. 03.2 · 1 mark Missing tadpole count calculation Value X is the number of tadpoles in sample 4, at 3 weeks. Calculate value X. 03.3 · 4 marks Tadpole population graph construction Complete Figure 4 to show how the total number of tadpoles changed over the 8 weeks. You should: label the x-axis; use a... 03.4 · 3 marks Tadpole survival percentage calculation After 0 weeks, no more tadpoles hatched in the pond. Calculate the percentage of the tadpoles that would still be found in the... 03.5 · 2 marks Tadpole mortality factors After 4 weeks many of the tadpoles had died. Suggest two reasons why the tadpoles died. 04.1 · 1 mark Dark treatment experimental control Give the reason why the student placed both sets of apparatus in the dark. 04.2 · 2 marks Seedling moisture controls What are two reasons for surrounding the seedlings with damp blotting paper? Tick (✓) two boxes. 04.3 · 2 marks Experimental control apparatus purpose Apparatus B is a control. Explain why apparatus B is needed. 04.4 · 3 marks Root growth response drawing Complete Figure 7 to show: the appearance of the root after 24 hours; the ink marks on the root after 24 hours. 04.5 · 1 mark Control root appearance comparison Describe how a root from apparatus B would look different from the root you drew in Question 04.4. 04.6 · 2 marks Auxin and root growth response Auxin is a plant hormone. Explain how auxin causes the results in apparatus A. 04.7 · 2 marks Auxin uses in plants Give two uses of auxin. 04.8 · 2 marks Gibberellin uses in apple production A farmer sprayed an apple tree with gibberellin. Suggest two reasons why the farmer sprayed the apple tree with gibberellin. 05.1 · 2 marks Human reaction-time method improvement Suggest two ways to improve the students' method for measuring human reaction time. 05.2 · 2 marks Endocrine and nervous coordination comparison Student B's reaction is coordinated by the nervous system. Give two ways that coordination by the endocrine system is different...