OCR A Level Biology B PAPER 1 JUNE 2022 OFFICIAL QP H422 01 Fundamentals of biology

OCR A Level Biology B PAPER 1 JUNE 2022 OFFICIAL QP -H422/01 Fundamentals of biology
A Level Biology B (Advancing Biology) H422/01 Fundamentals of biology 1 Stomatal conductance is a measure of the rate of diffusion of water vapour through the stomata of a leaf. Which of the environmental factors would cause an increase in stomatal conductance? A Decrease in temperature B Increase in humidity C Increase in wind speed D Reduced light intensity Your answer [1] 2 The photomicrograph shows a section through the stem of a sunflower, Helianthus annuus. Which of the options correctly identifies what is shown in the photomicrograph? A It shows phloem tissue in longitudinal section. B It shows phloem tissue in transverse section. C It shows xylem tissue in longitudinal section. D It shows xylem tissue in transverse section. Your answer [1] 3 Which part of a chloroplast contains the enzymes required for the light-independent reaction? A Granum B Inner membrane C Intergranal lamella D Stroma Your answer [1] 4 Which of the options would not prevent a climax community from forming? A Animal grazing B Coppicing C Pine forest plantation D Volcanic eruption Your answer [1] 5 Which nitrogenous base pairs with adenine during DNA replication? A Cytosine B Guanine C Thymine D Uracil Your answer [1] 6 The structure of a polymer is shown below. HOCH2 H OH O H HO CH OH H O CH2 H OH O CH2 H H OH OH O H HO CH OH H O H HO CH OH H 29 repeating units Which type of bond is broken down during the hydrolysis of this polymer? A Ester B Glycosidic C Peptide D Phosphodiester Your answer [1] 7 Water forms pleural fluid, a lubricant that reduces the friction between the lungs and the thoracic cavity during ventilation. Which of the statements about the properties of water explains its function as a lubricant? A A large amount of energy is required to change its temperature. B A large amount of energy is required to change liquid water into a vapour. C Adhesion allows water molecules to bond to surfaces. D It is a solvent. Your answer [1] 8 A scientist used a colorimeter during an investigation to measure the concentration of glucose in samples of urine. Which of the statements is/are correct? 1 The scientist used Benedict’s solution as a reagent. 2 The scientist checked the zero value of the colorimeter with distilled water to reduce systematic error. 3 The scientist assessed repeatability by repeating the measurements and calculating a mean. A 1, 2 and 3 are correct B Only 1 and 2 are correct C Only 2 and 3 are correct D Only 1 is correct Your answer [1]