Year 9 Cells, Tissues and Organs, Microbiology Revision Questions January 2018 Cell Structure Q1. The diagrams show a cheek cell from a human and a leaf cell from a plant. (a) The two cells have a number of parts in common. (i) On the cheek cell, label three of these parts which both cells have. In the table, write the names of the three parts you have labelled above and describe the main function of each part. (3) Part Function (3) (b) Blood contains white cells and red cells. State the function of each type of cell in the blood. White cells..... Red cells...... (2) (Total 8 marks) Page 1
Specialised Cells and Transport Q2. The drawing shows part of a root hair cell. (a) Use words from the list to label the parts of the root hair cell. cell membrane cell wall cytoplasm nucleus vacuole (4) (b) The diagram shows four ways in which molecules may move into and out of a cell. The dots show the concentration of molecules. The cell is respiring aerobically. Which arrow, A, B, C or D represents: (i) movement of oxygen molecules;... movement of carbon dioxide molecules?... (2) (c) Name the process by which these gases move into and out of the cell.... (Total 7 marks) Page 2
Yeast Cell Structure Q3. The diagram shows a yeast cell. Label structures A and B on the diagram. Choose your answers from the list in the box. cell membrane cell wall nucleus vacuole (Total 2 marks) Specialised Cells Q4. The diagrams show four types of cell, A, B, C and D. Two of the cells are plant cells and two are animal cells. Page 3
(a) (i) Which two of the cells are plant cells? Tick ( ) one box. A and B A and D C and D Which part is found only in plant cells? Draw a ring around one answer. cell membrane cell wall nucleus (b) (i) Which cell, A, B, C or D, is adapted for swimming? Which cell, A, B, C or D, can produce glucose by photosynthesis? (c) Cells A, B, C and D all use oxygen. For what process do cells use oxygen? Draw a ring around one answer. osmosis photosynthesis respiration (Total 5 marks) Page 4
Cell Structure and Calculations Q5. The diagram shows two cells, a bacterial cell and a plant cell. (a) (i) Both the bacterial cell and the plant cell contain ribosomes. What is the function of a ribosome? The plant cell contains mitochondria but the bacterial cell does not contain mitochondria.give one other way in which the plant cell is different from the bacterial cell. (b) (i) Both cells are drawn the same length, but the magnification of each cell is different.the real length of the bacterial cell is 2 micrometres. Calculate the real length, X, of the plant cell. Give your answer in micrometres. Show clearly how you work out your answer. X =... micrometres (2) Page 5
Most mitochondria are about 3 micrometres in length.the plant cell contains mitochondria but the bacterial cell does not contain mitochondria. Tissues and Organs Use your answer to part (b)(i) and the information in the diagram to suggest why. (Total 5 marks) Q6. In a living organism, the cells are organised into organs, systems and tissues. (a) Use words from the box to complete the list of these structures in order of size. organs systems tissues The smallest structure is at the top of the list and the largest is at the bottom. 1 cells 2... 3... 4... 5 organism (b) List A gives three tissues found in the human body. List B gives four functions of tissues. Draw a straight line from each tissue in List A to its correct function in List B. List A Tissue List B Function Covers many parts of the body Muscular tissue Contracts to cause movement Glandular tissue Divides by meiosis Epithelial tissue Releases hormones or enzymes (3) (Total 4 marks) Page 6
Culturing Microorganisms Q7. The following are precautions taken when preparing a streak of bacteria on an agar jelly plate. Give a reason for each. (i) The inoculating loop is heated in a hot bunsen flame. REASON:...... The loop is allowed to cool before putting it into the bacterial culture. REASON:...... (iii) The lid of the petri dish is only partly opened. REASON:...... (iv) The petri dish is sealed with sticky tape. REASON:...... (Total 4 marks) Q8. (a) Microorganisms can be grown on agar jelly in a Petri dish.list A gives three actions used when growing microorganisms.list B gives four possible effects of these actions. Draw a straight line from each action in List A to its effect in List B. Page 7 (3)
(b) UHT milk is milk that has been heated to 135 C, then cooled. In an investigation, three sterile Petri dishes containing sterile agar jelly were set up as follows. UHT milk was added to dish 1. Untreated milk was added to dish 2. Dish 3 was left unopened as a control. The dishes were kept at 25 C for two days. The results are shown in the diagram below. (i) Describe the difference in appearance between dishes 1 and 2 after two days....... Give one reason for this difference....... (iii) There was no change in the appearance of dish 3 after two days. Give one reason why....... (Total 6 marks) Page 8