Grade 08 Angel International School - Manipay 1 st Term Examination November, 2017 Duration: 2.00 Hours 1) MULTIPLE CHOICE QUESTIONS 1) Microorganisms that prepares their food from water and carbon dioxide are a) photosynthetic amoeba c) photosynthetic hydra b) photosynthetic algae d) photosynthetic flagella Index No:- 2) Production of individuals of same genus is called a) reproduction b) fission offspring c) fragmented offspring d) budded offspring 3) This diagram shows a typical bacterial cell. Identify the label representing the structure that enables a bacterium to move in a watery environment. a) D b) C c) A d) B 4) Microorganisms that prepares their food from water and carbon dioxide are a) photosynthetic amoeba b) photosynthetic algae c) photosynthetic hydra d) photosynthetic flagella 5) Viruses are considered as non-living organisms because of a) crystalline nature b) presence of chitin c) absence of chloroplasts d) absence of polysaccharides 6) Interaction between a biotic components and biotic community is classified as a) ecosystem c) community b) population d) artificial biosphere 7) Animals that are fed on plants are classified as a) secondary producers b) herbivores c) carnivores d) omnivores 8) Identify which organism is the primary consumer in this food chain a) The cat b) The spider c) The sparrow d) The insect 9) Forests clearing by humans or natural causes is classified as a) urbanization b) localization c) deforestation d) deplantation 10) All substances that are major causes of pollution are classified as a) compounds c) oxides b) acids d) pollutants Gr8-1
11) Production of individuals of same genus is called a) reproduction b) fission offspring c) fragmented offspring d) budded offspring 12) During severe drought, vegetation can die. Consider the following food chain: grass kangaroo dingo If all grass died off, predict the effect on the number of dingoes a) The number of dingoes would increase because the kangaroos would have no food. b) The number of dingoes would increase because they will breed more. c) The number of dingoes would decrease because the kangaroos would die off and the dingoes would have less to eat. d) There would be no change because dingoes do not eat grass. 13) In this food web, organisms are represented by the numbers 1 to 7. Identify the organism that is most likely to be a producer. a) 1 b) 5 c) 6 d) 2 14) The flow of energy in an ecosystem can be represented in a pyramid. Producers are found at the base. Identify the incorrect statement concerning the organisms found in level 4 of this pyramid a) Level 4 organisms transfer less energy to level 3 than they receive b) Level 4 organisms are not meat eaters. c) Level 4 organisms are greater in number than level 3 organism d) Level 4 organisms transfer more energy to level 3 than they receive. 15) Analyse this diagram. Identify what it shows. a) Examples of protists b) Examples of viruses c) Examples of bacteria d) Examples of sea weeds 16) This diagram is a virus. Which of the following disease is not spread by viruses? a) Influenza b) tetanus c) Tuberculosis d) rubella 17) These groups of organisms have long thread like bodies their cells contain nuclei, some of them produce antibiotics. Which group of organism is being described? a) Bacteria b) Plants c) Fungi d) Viruses 18) A mosquito transmits malaria and is there described as a a) Parasite b) Pathogen c) Vector d) Virus 19) Penicillin is secreted by... a) Bacteria b) Fungi c) Virus d) Fungi Gr8-2
20) What are productions of above organisms, when they are respired anaerobically? a) Alcohol and carbon dioxide b) Oxygen and carbon dioxide c) Alcohol and sugar d) Glucose and carbon dioxide 21) The thread-like structures present in the nucleus are a) Nucleolus b) Genes c) Chromosomes d) ribosomes 22) Which of the following is not a cell? (i) Red Blood Corpuscle (RBC) (ii) Bacterium (iii) Blue green algae (iv) Virus a) ii and iv b) ii and iii c) i and ii d) i and iv 23) There are different types of bacteria according their body shape. What are they? a) Bacilli b) Cocci, vibrio c) Spirilli d) All of the above 24) Under a microscope Paheli observes a cell that has a cell wall but no distinct nucleus. The cell that she observes is a) a plant cell b) a nerve cell c) an animal cell d) a bacterial cell 25) Read the following pairs of examples of organisms: a) moss and sponge b) bacteria and blue-green alga c) yeast and Amoeba d) penicillium and Spirogyra The pair that belongs to the group prokaryotes is 26) One Of the following parts of a cell listed below, name the part that is common to plant cell, animal cell and a bacterial cell. a) chloroplast b) cell membrane c) cell wall d) nucleus 27) What are the factors important in predicting changes in population? a) competition and adaptation b) predation c) birth rates and death rates d) all of the above [1X25=25 marks] Gr8-3
Part -2 1. Match the letter in the diagram (right) with the best statement: (1X5=5 marks) 2. Small animals are collected by ecologist to study about them which are too soft and harmful. Therefore some special methods are used to collect these organisms and some are use as indicators of pollution a) Write five methods of collecting small animals in land habitats. And where they collected from. (5) methods Where they collected b) What are types of pond net use to collect the small creatures from aquatic habitats? (3) c) Why ecologists are kept the animals in the laboratory? (1) d) Name the organisms which are used as biological indicators of air pollution? (1) e) Explain how the above creature helps to find the pollution in the air? (3) f) What are the organisms used to estimate the amount of pollution in aquarium? (4) g) Explain how the above creatures help to find the pollution in the aquarium? (4) h) How to make a transect? (1) i) How to record the plant life by using a quadrat? (2) j) How four groups of plants are reproduce? (4) k) What are fronds in ferns? (1) l) How mosses differ from conifers? (1) (total - 30) Gr8-4
3. (a)answer the following questions by using the knowledge of kingdom a. Which of the following are (a) fungi, (b) flowering plants? [ ferns, mushrooms, trees, cabbages, moulds, toadstools, seaweeds, grasses, mosses, cacti ] (5) b. Why are fungi not placed in the plant group? (1) c. How does yeast make the spongy texture of the bread? (2) d. What are the ingredients need to make alcoholic drinks? (2) (b)vinegar is made by allowing microbe to feed on ethanol and change it into vinegar. a. What are the microbial conversions occur during the vinegar production? (1) b. Name the natural compound that can be used to produce natural vinegar. (1) c. When you are producing vinegar, what is the intermediate product formed before the end product? (1) d. What is the type of microorganism used in the first step of vinegar production? (1) e. Write two other products produce by the help of the above organism? (1) (c) Some small organisms are essential for our life. a. What is decomposer and give 3 examples? (3) b. How to call the feeding of dead bodies of plants and animals and waste by decomposers? (1) c. Why are decomposers important? (1) (Total -20) 4. The following diagrams show three pyramids of numbers. A B C Gr8-5
i. Which is the diagrams A, B or C best represents the food chain: Rose bush aphids ladybirds blackbirds (1) ii. The aphids began feeding on leaves on the ground. Which diagram best represents the pyramid of numbers now? (1) iii. What are the types of pyramid you studied? (3) [Total -5] 5. Our body has a special cell to fight against germs a) How antigens differ from antibodies? (1) b) There are four types of antigens used in immunization vaccine. Name two types of antigen out of the four. (2) c) Which is the natural immune system in the body? (1) d) How natural immune systems destroy harmful microorganisms? (2) e) What is an antibiotic? (1) f) Give three examples for antibiotics. (3) g) What is the purpose of giving a vaccine to a person? (1) h) Which is I. First antibiotic and II. Antiseptic? (2) i) Write two factors that effect to the growth of microorganisms. ( 2) (Total -15) ***** Gr8-6