Science Class 7 Topic: Habitats And Food Chains .

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ScienceClass 7Topic: Habitats And Food ChainsReinforcement WorksheetName: Sec: Date:Q.1 Circle the right answer:1.Which food chain correctly describes the flow of energy in an ecosystem?a)b)c)d)Grass-- cow-- humanCaterpillar-- leaf-- human.Cow-- grass-- humanLeaf-- bird-- caterpillar2. Example of omnivores isa)b)c)d)LionHawkHumanSnake3. Look at the following food chain and identify the secondary consumer.Water weedsa)b)c)d)pond snailgreat diving beetleheronHeronPond SnailGreat diving beetleWater weeds4. Which of the following characteristics help(s) water hyacinth to float on water?a)b)c)d)Air spacesWaxy leavesSucculent stemTendrilsThe City School / Reinforcement Worksheet/ EoY 2015 / Science / Class 7/ Habitats And food ChainsPage 1 of 6

5. When animals depend on plants and plants depend on animals for food and protection, wesay that they tQ.2 Fill in the blanks.1. reflects light upward through the diaphragm and specimen in amicroscope.2. pumps blood around the body.3. Chloroplast contains , which traps the lightQ3. Match the following1. food web2. decomposers3. behavioral adaptation4. pollution5. herbivorea. mushrooms, fungi, or mold and bacteria.b. contamination of an environment especially by waste.c. how plants and animals in a habitat connect throughtheir food.d. animals feeding on plantse. wolves hunting in a packQ4. Complete the table.OrganismTurtleHabitatAdaption for survival (any 1)Mosquito larvaCactusVine treesWater hyacinthsOwlThe City School / Reinforcement Worksheet/ EoY 2015 / Science / Class 7/ Habitats And food ChainsPage 2 of 6

Q5. Identify consumers and predators from the food web given below.a) Consumersb) Predatorc) What would happen if the top predators were killed?d) Identify an organism(s) which is both a predator and a prey.Q6a) A community in which barn owls and snakes consume only mice is being observed. Ifthe number of snakes increases, what is most likely to happen first?b) Why producers are always found at the beginning of a food chain?c) Why pesticides are said to “ move up the food chain”.d) Why an increase in pesticides use has resulted in a decrease in the local bat population.The City School / Reinforcement Worksheet/ EoY 2015 / Science / Class 7/ Habitats And food ChainsPage 3 of 6

Q7a. Look at the food web and answer the following questions.Complete the following sentences using the words increase or decrease to describe whathappen to the food web.i.If sparrows are eaten by snakes, then the number of caterpillars will.ii.If mice increase in number, then the number of snakes will?b).Look at the following food chain. The numbers in brackets show how many of eachorganisms was found in each chain. Make a pyramid using this information:i)Lettuce (14) --- slug (8) ---- hedgehog (1)The City School / Reinforcement Worksheet/ EoY 2015 / Science / Class 7/ Habitats And food ChainsPage 4 of 6

ii)rose bush (1)-- greenfly (26)-- bird [6]Q8. Answer each riddle below keeping in mind the food chain. A food chain always begins witha producer.1. I am a fungus. I break down dead plants and animals.What am I?2. I am a tree. I make my own food. What am I?3. I am a living thing that cannot make food. What am I?4. I am a bear. I eat berries and fish. What am I?Q9. Give reasons:1. Fishes have streamlined bodies.2. Penguins have webbed feet while seals have flippers3. Dolphins and whales are not fishes.4. The leaves of cacti are reduced to needles and pines.The City School / Reinforcement Worksheet/ EoY 2015 / Science / Class 7/ Habitats And food ChainsPage 5 of 6

Q10.What are the adaptations which help polar bear to survive the extremely lowtemperatures in its habitat?Ans.The City School / Reinforcement Worksheet/ EoY 2015 / Science / Class 7/ Habitats And food ChainsPage 6 of 6

The City School / Reinforcement Worksheet/ EoY 2015 / Science / Class 7/ Habitats And food Chains Page 2 of 6 5. When animals depend on plants and plants depend on animals for food and protection, we say

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