Biology

Question Answers Extra information Mark AO / Spec. Ref. 01.1 1 AO3 4.1.3.1 01.2 water mineral ions energy in this order only allow minerals / ions 1 1 1 AO1 4.1.3.2 4.1.3.3 4.2.3.2 01.3 root hair (cell) ignore root / hair unqualified 1 AO1 4.1.1.3 4.2.3.2 01.4 large surface / area allow it has a long projection allow the walls are thin allow it has lots of mitochondria 1 AO1 4.1.1.3 4.2.3.2 01.5 do not accept more than one line from a box on the left 1 1 AO1 4.1.1.3MA...

The theory of evolution states that organisms alive today evolved by natural selection from other species that are now extinct. 0 1 . 1 Which two scientists proposed the theory of evolution by natural selection? [2 marks] Tick () two boxes. Alexander Fleming Alfred Russel Wallace Carl Linnaeus Carl Woese Charles Darwin Fossils provide evidence for evolution. Figure 1 shows a fossil footprint of a dinosaur. Figure 1 Do not write outside the box3 *03* Turn over ► IB/M/Jun21/...

This question is about cells. 0 1 . 1 Which diagram shows oxygen moving by diffusion? [1 mark] Tick () one box. 0 1 . 2 Complete the sentences. [3 marks] Choose answers from the box. carbon dioxide chlorophyll energy light mineral ions water Plant cells absorb substances from the soil. Plant cells use osmosis to absorb . Plant cells use active transport to absorb . Active transport moves substances against the concentration gradient and needs .3 *03* Turn over ► IB/M/Jun21/8...

Question Answers Extra information Mark AO / Spec. Ref. / Demand 01.1 times are very short / in milliseconds or milliseconds cannot be measured with a stopwatch 1 AO3 4.5.2.1 Standard 01.2 to increase validity / repeatability or to get representative results because of variation in results allow to give a more reliable mean value allow to identify any anomalies 1 1 AO2 4.5.2.1 Standard 01.3 (they have included) 468 / the 7th result (which) is anomalous / is a much highe...

Three students measured their reaction times. The students used a computer program. Figure 1 shows the image displayed on the computer screen. Figure 1 Wait This is the method used: 1. Sit facing the computer screen. 2. Click the mouse button as quickly as possible when the computer screen turns green. 3. Record the time taken as shown on the computer screen. 4. Repeat steps 2 and 3 a further 9 times. Wait for green SPECIMEN MATERIAL IB/M/SAMs2/8461/2H3 Do not write outside the box...

In respiration, glucose is broken down. 0 1 . 1 What is the chemical formula for glucose? [1 mark] Tick one box. C6H6O6 C3H6O3 C6H12O6 C6H10O6 Figure 1 shows the apparatus a student used to investigate aerobic respiration. Figure 1 Limewater goes cloudy when carbon dioxide is added to it. SPECIMEN MATERIAL IB/M/SAMs2/8461/1H3 Do not write outside the box 0 1 . 2 After 10 minutes the limewater in flask B was cloudy, but the limewater in flask A remained colourless. Explain why. [...

Question Answers Extra information Mark AO / Spec. Ref. / Demand 01.1 C6H12O6 1 AO1.1 4.4.2.1 Standard 01.2 atmospheric air contains less carbon dioxide than exhaled air (flask B goes more cloudy because) carbon dioxide is produced in (aerobic) respiration (by woodlice) allow converse do not accept anaerobic respiration 1 1 AO2.2 4.4.2.1 Standard 01.3 for comparison / to compare or to check that no other factor / variable is influencing the results allow answers in the c...

Charles Darwin proposed the theory of natural selection. Many people at the time did not accept his theory. 0 1 . 1 There was a different theory at the same time as Darwin’s theory. The different theory said that changes in an organism during its life could be inherited. Who proposed this theory? [1 mark]3 SPECIMEN MATERIAL 0 1 . 2 Studying fossils helps scientists understand how living things have evolved. Figure 1 shows a fossilised snake. Figure 1 Explain how the fossil in Figure...

Question 1 Question Answers Extra information Mark AO / Spec. Ref. 01.1 (Jean Baptiste) Lamarck allow phonetic spelling 1 AO1/1 4.6.3.1 01.2 (snake is) covered in sediment / mud or sinks into the mud (then) the soft parts decay / are eaten or bones / hard parts do not decay (so) minerals enter bones or bones are replaced by minerals 1 1 1 AO2/1 4.6.3.5 AO2/1 4.6.3.5 AO1/1 4.6.3.5MARK SCHEME – GCSE BIOLOGY – PAPER 2H – SPECIMEN MATERIAL 7 Question 1 continued Questi...

Plants transport water and mineral ions from the roots to the leaves. 0 1 . 1 Plants move mineral ions: • from a low concentration in the soil • to a high concentration in the root cells. What process do plants use to move these minerals ions into root cells? [1 mark] Tick one box. Active transport Diffusion Evaporation Osmosis 0 1 . 2 Describe how water moves from roots to the leaves. [2 marks] Question 1 continues on the next page4 SPECIMEN MATERIAL Plants lose water through...