Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Do not write outside the box Cells and Cell Structure 1 The diagram below shows a human sperm. The sperm cell can swim by moving the tail in a side to side motion. ! ! Mid-piece Head Tail ! 1 (a) (i) The mid-piece shown in the diagram contains many mitochondria. Suggest a reason why there are many mitochondria in the mid-piece of the sperm cell. Provide/release energy [1 mark] Through respiration or aerobic respiration [1 mark] (2 marks) not to say ‘produce energy or ‘create energy’, as these terms are !!Remember technically incorrect. The science specs are very fussy about that. !1 (b) A sperm cell is compared to a cell that comes from a plant called a leaf mesophyll cell. !! A !! !! 1 (b) (i)! Name part A that both cells have in common. Nucleus [1 mark] (1 mark) ! 1 (b) (ii) Name one part shown in the diagram that is present in the leaf cell only. Cell wall/vacuole [1 mark] !! ! ! You might get a mark for saying chloroplast, as it is not totally clear that the structure other than the nucleus is a vacuole. (1 mark) Total 4 marks Turn over for the next question my-GCSEscience.com ESPQ|BLY2|CLLSCR !! !! Cells and Cell Structure Do not write outside the box ! 2 ! ! ! ! ! ! ! ! ! !2 (a) Diagrams X, Y and Z show some cells. They are not all drawn to the same scale. X Y Z DNA Mitochondria Which cell, X, Y or Z, has adaptations to increase diffusion? Cell Y [1 mark] Give one reason for your choice. (Because) the membrane is folded or it has folds in the membrane [1 mark] You are allowed, ‘has high or large surface area’ 2 (b) Cell X is found in muscle tissue. What is a tissue? (2 marks) A group of cells [1 mark] ! ! Which have a similar structure [1 mark] And have a similar function [1 mark] (2 mark) 2 (b) (i) Cell X has the function of contracting to allow movement of muscles. Use the diagram to explain one adaptation of this cell which helps contraction for movement. ! ! ! 2 (c) It has lots of mitochondria [1 mark] Which release energy [1 mark] See the note above about the terminology here. Through (aerobic) respiration [1 mark] (2 marks) Cell Z is a bacterial cell. Give one piece of evidence from the diagram that shows that cell Z is a bacterial cell. (It) has no nucleus or the DNA is not in a nucleus [1 mark] or it has a tail / flagellum The cell wall is not allowed for this mark, because plant cells also have cell walls. (1 mark) (Total 7 marks) my-GCSEscience.com ESPQ|BLY2|CLLSCR