T3W6 [USS] S4 BIO PRELIMS 2023 P2 QP

Sec 4E Biology P2 Page 1 of 20 USS Prelim Exam 2023 Name: CCA Home Group: Learning Group: Index Number: UNITY SECONDARY SCHOOL Preliminary Examination 2023 Secondary Four (Express) BIOLOGY Paper 2 6093/02 13 September 2023 1 hour 45 minutes Candidates answer on the Question Paper. No Additional Materials are required. READ THESE INSTRUCTIONS FIRST Write your name, class and index number on all the work you hand in. Write in dark blue or black pen. You should use a soft pencil for any diagrams or graphs. Do not use staples, paper clips, glue or correction fluid. Section A Answer all questions in the spaces provided on the Question Paper. Section B Answer all three questions. The last question is in the form of either/or. Write your answers in the spaces provided on the Question Paper. Electronic calculators may be used. You are advised to spend no longer than one hour on Section A and no longer than 45 minutes on Section B. The number of marks is given in brackets [ ] at the end of each question or part question. This document consists of 20 printed pages, including this cover page.

Sec 4E Biology P2 Page 2 of 20 USS Prelim Exam 2023 Section A Answer all questions. Write your answer in the spaces provided. 1 A student investigated the volume of water lost in one hour by different species of plants at different temperatures. Fig. 1.1 shows the results. Fig. 1.1 (a) Compare the volume of water loss in species A and species B. ........................................................................................................................................... ........................................................................................................................................... ........................................................................................................................................... ........................................................................................................................................... ........................................................................................................................................... ...................................................................................................................................... [3]

Sec 4E Biology P2 Page 3 of 20 USS Prelim Exam 2023 (b) The investigation was repeated with increased humidity. The temperature was cool. Draw one additional bar on Fig. 1.1, for species B only, to show the expected result. [2] (c) State the name of the vessels that transport water through a plant. ...................................................................................................................................... [1] [Total: 6]

Sec 4E Biology P2 Page 4 of 20 USS Prelim Exam 2023 2 Fig. 2.1 shows two photomicrographs of a cross-section of trachea. Fig. 2.1 The open space at the centre of the trachea is labelled A in Fig. 2.1. Air travels into and out of the trachea through this open space. (a) Identify the following structures or substances in Fig. 2.1 and explain their functions. structures functions B: …………….………… C: …………….………… E: …………….………… [3] gland cell

Sec 4E Biology P2 Page 5 of 20 USS Prelim Exam 2023 (b) (i) Table. 2.1 shows some events during inspiration. Table 2.1 Put the events shown in Table. 2.1 into the correct sequence. T V [2] (ii) Suggest why alveoli have thin walls. ................................................................................................................................. ................................................................................................................................. ................................................................................................................................. ............................................................................................................................. [2] [Total: 7]

Sec 4E Biology P2 Page 6 of 20 USS Prelim Exam 2023 3 Fig. 3.1 shows part of the circulatory system, and some of the structures associated with organ B. Fig. 3.1 (a) Name organ B in Fig. 3.1 ……………………………… [1] (b) Name the blood vessels C and E in Fig. 3.1 C ……………………………………. E ……………………………………. [2] (c) Complete Table 3.1 to show four differences between the contents of F and the blood vessel, C, in a healthy person. Table 3.1 difference C F 1 2 3 4 [4] [Total: 7]

Sec 4E Biology P2 Page 7 of 20 USS Prelim Exam 2023 4 (a) Fig. 4.1 shows the changes that happen to the thickness of the uterine lining during the menstrual cycle. Fig. 4.1 Use Fig. 4.1 to answer the following questions: (i) State the number of days of this menstrual cycle. ..................................... (ii) State the number of days that menstruation lasts. ..................................... (iii) State the day on which ovulation is most likely to occur. ..................................... (iv) State one day when the uterus lining is at its thickest. ..................................... [4] [Total: 4]

Sec 4E Biology P2 Page 8 of 20 USS Prelim Exam 2023 5 Apple scab is a disease that infects apple trees. Fig. 5.1 shows apples from uninfected and infected apple trees. uninfected apple tree infected apple tree Fig. 5.1 There is a gene that determines whether or not apple trees are resistant to apple scab disease. There are two alleles for this gene: • disease-resistant, R • not disease-resistant, r (a) A farmer wanted to do a test cross to identify the genotype of disease -resistant apple trees. This would tell him whether his trees were either homozygous dominant or heterozygous. Determine the phenotypes of the offspring if the unknown parent apple tre e was heterozygous. Complete the genetic diagram: parental phenotypes disease-resistant not disease-resistant parental genotypes ………………………… x ………………………… gametes x offspring genotype ………………………………………………………………… offspring phenotype ………………………………………………………………… [5]

Sec 4E Biology P2 Page 9 of 20 USS Prelim Exam 2023 (b) The farmer wanted to breed disease -resistant apple trees. He decided not to use heterozygous disease-resistant apple trees in his selective breeding programme. Explain why. ........................................................................................................................................... ........................................................................................................................................... ........................................................................................................................................... ........................................................................................................................................... ........................................................................................................................................... ...................................................................................................................................... [2] (c) (i) The farmer wanted to be sure that only the selected disease -resistant apple trees would reproduce. Suggest what the farmer could do to ensure that only the selected apple trees were pollinated. ................................................................................................................................. ................................................................................................................................. ...........................................................