Class7 Chapter 01 Nutrition in plants and Animals Cordova Science Exercise A (Tick) the correct options: 1. Rhizobium bacteria live in the root nodules of plant (a) wheat (b) rice (c) barley (d) peaÖ 2. Plants store food as (a) cellulose (b) sugar (c) glucose (d) starchÖ 3. Which of the following is an insectivorous plant? (a) Cucuta (b) DroseraÖ (c) mistletoe (d) lichen 4. The mode of nutrition shown by Cuscuta is (a) parasiticÖ (b) symbiotic (c) saprophyte (d) autotrophic 5. On adding iodine solution, starch (a) turns blue blackÖ (b) turns green (C) remains colourless (d) turns red 6. We keep healthy potted plant in a dark room for some days to the leaves (a) decolourise (b) defragment (c) destarchÖ (d) deprotein 7. The portion of leaf that is not exposed to sunlight, will not make (a) fats (b) protein (c) glucose Ö (d) starch B.Fill in the blanks: 1. Rhizobium bacteria provide --nitrogen---- to the leguminous plants. 2. Green plants make their food by the process of photosynthesis. 3. Stomata are surrounded by guard cells. 4. Cuscuta is a -Total--- parasite. 5. The roots of saprophytes contain organisms called ….symbionts C. Very Short Answer Questions: 1. Name any two heterotrophs. Ans: Animals,Mushroom 2. Name any two insectivorous plants. Ans: Venus flytrap, pitcher plants, butterworts, sundews 3. Name the pores through which leaves exchange gases. Ans: Stomata 4. Name one plant in which photosynthesis occurs in plant part other than leaves. Name the plant part. Ans: cactus in it's stem 5. What are the two main modes of nutrition in plants? Ans: Autotropic and heterotrophic 6. Name the green pigment present in the leaves. Ans: Chlorophyll D. Short Answer Type-l Questions: 1. What are autotrophs? Ans: Organism prepare own food like green plants 2. Why is Cuscuta called parasite? Ans: Cuscuta is called parasite as it draw nutrition from host. 3. In which form, do plants need nitrogen? Ans: Plants absorb nitrogen from the soil in the form of nitrate (NO3−) and ammonium (NH4+) 4. Why are leaves of a plant green in colour? Ans: leaves of a plant are green in colour due to presence of chlorophyll. 5. Why do some plants feed on insects? Ans: some plants feed on insects to get nitrogenous compound from which they make protein 6. Define photosynthesis. Ans: Photosynthesis is the food making process of green plant using CO2 and water in the presence of sunlight E. Short Answer Type-ll Questions: 1. How can we decolorized a leaf? What will you conclude when white patches do not turn blue black adding iodine solution? Ans: Leaf of green plant heated in a test tube containing alcohol in water bath to decolorize. if white patches do not turn blue black adding iodine solution showing absence of starch 2. What is saprotrophic mode of nutrition? Give one example. Ans: The mode of nutrition in which organism derive nutrients from dead and decaying organic matter. Eg. Mushroom. Saprophytes breakdown organic matter by secreting digestive juice into it. Then they absorb what they need from the digested matter. 3. How does the pitcher plant catch its food? Ans : Pitcher plants have leaves that look like pitchers. The lid of the pitcher closes when an insect lands on the pitcher. The trapped insect slides down the wall of the pitcher and is digested inside it. 4. Algae and fungi live together in lichens. (a) What is this association called? (b) What value can we learn from this association in nature? Ans: The fungus provides minerals and water to the alga. The alga supplies the fungus with food that it manufactures. (a) Symbiotic relationship (b) We live with other in mutual benefit take help and give help. 5. Discuss the importance of photosynthesis. Ans: Photosynthesis helps green plant to prepare glucose. Photosynthesis use CO2 and release O2 and thus balance the oxygen and carbon dioxide level in atmosphere. Water vapor released during photosynthesis also help in formation of cloud and bring rain. F. Long Answer Questions: 1. Write an experiment to show that sunlight is necessary for photosynthesis. Ans: cover a part of a leaf of a potted plant with black paper. Use paper clips to fix the paper on both sides of the leaf Make sure the plant get enough sunlight Pluck the leaf and take off the paper after two days. Heat the leaf in alcohol, as in the previous activity, and test for starch. Only the part of the leaf which was exposed to sunlight will turn blue-black. This shows that sunlight is necessary for photosynthesis. 2. How do Rhizobium bacteria and leguminous plants help each other in survival?
Ans: Plant provide shelter to Rhizobium bacteria and Rhizobium bacteria provide nitrogenous compound that plants required to make plants protein. G. HOTS (Higher Order Thinking Skills) Questions: 1. What will happen if plant leaves are devoid of stomata? Ans: if plant leaves are devoid of stomata there is no exchange of gases like O2 and CO2 . Plants cannot perform photosynthesis 2. What will happen if all the plants disappear from the earth? Ans: Food chain unbalance and no life exist. For more chapter visit 7th science
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E. Short Answer Type-I Questions: 1. What is meant by agricultural implements? Ans: Agricultural implements are any kind of machinery or tools used on a farm to help with farming. The best-known example of this kind is the tractor. 2. How do legurninous plants help in maintaining the soil fertility? Ans: Rhizobium bacteria present in the root of legurninous plants convert the atmospheric nitrogen into ammonia into soil, which is used by plants. 3. What is pisciculture? Ans: Rearing of fish is called pisciculture. 4. Why is it important to sow seeds at a correct distance from each other? Ans: Seeds should be shown at a correct distance from each other so that seed get sufficient sunlight, nutrients and water from the soil. 5. Give two precautions that must be taken while sowing seeds. Ans: seeds should be shown with right spacing and at right depth 6. How does winnowing help in separation of grains from husk? Ans: When mixture of grain and chaff dropped on the ground from a height, The heavier seeds fall on the ground where as the lighter chaff gets blown away by the wind and fall at a distance. 7. Why is the spraying of pesticides harmful to us? Ans: The spraying of pesticides cause irritation to skin and respiratory problems. They get mixed with soil and water and absorbed by plants. These then enter our bodies through fruits and vegetables which we eat and cause us harm.. F. Short Answer Type-II Questions: 1. (a) Why is irrigation necessary? (b) Why is the drip system of irrigation a water- economical method? Ans: Rain varies and doesnot always supply the right amount of water at right time. Therefore it is important to supply water regularly to the crops. 2. Define fertilisers. Name any four fertilisers. Ans: Chemical substance that contain one or more nutrients essential for plants eg Urea., Calcium Nitrate, Ammonium Sulfate, Super Phosphate 3. The farmers of a village are celebrating the harvest festival of Baisakhi along with their families. They are dancing and singing traditional songs. (a) What is harvesting? Why do farmers celebrate Baisakhi? (b) What do we learn from celebrating festivals? Ans: (a) Cutting and gathering of mature crops is called harvesting. (b) Farmers celebrate Baisakhi to express gratitude to the Almighty for the bountiful harvest and pray for prosperity and good times in future G. Long Answer Questions: 1. (a) What are weedicides? (b) Name one weedicide. (c) What are the harmful effects of weeds in the crop field? Ans: Weedicides are chemicals that kill weeds (b) 2, 4-D and MCPA or Butachlor (c) Weeds compete with the crop for water mineral and sunlight and therefore reduce crop yield. 2.(a) Differentiate between manure and fertilizers. (b) What are the advantages of using manure? Ans: (a) Difference between manure and fertilizers. Fertiliser
Manure
(b) Organic manure is considered to be better than fertilisers. It is because of the following reasons to be (a) It enhances the water holding capacity of the soil. (b) It makes the soil porous, thus making the exchange of gases easy. (c) It also improves the texture of the soil. (d) It increases the number of friendly microbes. HOTs 1. Why do farmers level the field before sowing? Ans: For the uniform distribution of water and manure in a field, a farmer practices 2. During ploughing why is the land pressed lightly and not tightly? Ans: This is because loose soil allow root to breathe easily and allow root to penetrate deeper .Loose soil also help in the growth of earthworm and microbes that provide nutrients to soil.
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Ponder over it: In our India to increase in food grain production Dr M. S. Swaminathan started green revolution In 1963. In agriculture high-yielding wheat seeds were introduced in India. Also, modern farming methods began to be used at large scale in India. So He is known as the 'Father of the Green Revolution in India. Choose the correct option 2. The ________is an edible part of potato plant (a) leaf (b) root (c) sternÖ (d) fruit 3 We can sprout seeds in __________ (a) rocks (b) waterÖ (c) oil (d) none of these 4. The sprouted seeds contain more (a) carbohydrates (b) fats (c) vitamins Ö (d) water 5. The edible part of the apple plant is ___ (a) leaf (b) root (c)Stem (d) fruit Ö 6. we eat root of _______ (a) mustard (b) rajma (c) chili (d) radishÖ 7. The colour of the structures grown out from the sprouted seeds is (a) black (b) whiteÖ (c) red (d) green Fill in the blanks: 1. We get sugar from _Sugarcane________ 2. We get milk from __Cow ____ and ___buffalo______. 3. Honeybees store honey in their ___ honey stomach _________. 4. _Rice __ and ___water___are two ingredients of boiled rice. 5. Animals that eat both plant products and flesh of other animals are called _Omnivores___ 6. Bacteria and fungi are called ____ decompose ____. 7. We should not ___waste_ food in any way. 8. Honeybees are kept in __ beehive ___ for rearing. Very Short Answer Questions: 1. What are the animals that eat only plants and plant products called? Ans: Herbivores 2. Name four food items we get from animals. Ans: Egg, Meat, milk, Ghee 3. Name two edible stems. Ans: Potato , sugarcane 4. What are the materials needed to prepare food items called? Ans: Ingredients 5. What is the rearing of honeybees on a large scale called? Ans: apiculture 6. Name two plants whose flowers are eaten as vegetable. Ans: Cauliflower, Braccoli Short Answer Questions: 1. Why do we need food? Ans: We need food (i) to get energy (ii) grow and replace worn out cell (iii) protect body from diseases 2. What are edible parts? Give name of one. Ans: Part of plants that are eaten by humans is called edible parts. Wheat, pea and rice are plant whose edible part is seed 3. Honeybees work hard to collect nectar from flowers. (a) Where is this nectar stored? (b) What value do you learn from honeybees? Ans (a) bee hive (bee stomach) (b) Hard work is key of success. 4. How can food problem be solved? Give two ways. Ans: Food problems be solved by (i) Avoid wastage of food (ii) Using modern technology and best practices in agriculture 5. How are scavengers and decomposers useful to us ? Ans: scavengers and decomposers feed on dead plants and animal. In this way they decompose waste and keep our environment clean and enrich nutrients in soil. 6. What Is food chain? Give one example. Ans: One who eats what in the environment is called food chain. Eg. Grass -> Zebra- >Lion F. Long Answer questions: 1. How will you sprout seeds? Ans: At first wash the seeds in water, drain the water. Keep seeds in bowl and cover it with a wet cloth and leave them for another day. The next day, you will see the seeds have sprouted. 2. Distinguish between (a) herbivores and carnivores (b) scavengers and decomposers Ans: (a) Animals which eat only plants or plant products are called herbivores eg cow, goat. Animals which eat flesh of other animals are called carnivores eg lion, Tiger. (b) An animal that feeds on dead organisms or by hunting live prey is called scavengers. Eg. Vultures, hyenas, and wolves . They help break down or reduce organic material into smaller pieces. These smaller pieces are then eaten by other organism called decomposers eg, earthworm, fungi, bacteria. HOTS (Higher Order Thinking Skills) questions: 1.Your mother makes food In the kitchen. Is she a 'producer'? Why/Why not? Ans: No. My mother is not a producer as she uses ingredients obtain from plants Solve the following crossword puzzle: Across: 1. animals that eat both plants and flesh of other animals Ans: Omnivores 2. Rearing of honeybees on a large scale is called Ans: Apiculture Down 3. the materials needed to prepare food items Ans: ingredients 4. a tasty and nutritious food item we get from honeybees Ans: Honey 5. the parts of the plant which can be eaten are called parts Ans: edible part
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Secondary School Certificate Examination (IX-X) Senior School Certificate Examination (XI-XII) In order to provide suggestions to alleviate curricular load in cognitive area for increasing the availability of time to core curricular activities like Life Skills, experiential learning, sports, visual and performing arts and work education, specific suggestions are invited. Suggestions could be made at mhrd.gov.in/suggestions latest by 6thApril (Friday). It will be appreciated if suggestions are precise. Note: For queries if any write an email at [email protected]. |
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