Download Class 8 Science Worksheets for All Chapters
Review targeted practice sets for Class 8 Science All Chapters. Built according to official educational guidelines for the 2026-27 academic year, these downloadable worksheets support daily revision and core concept reinforcement.
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View or download the dedicated All Chapters practice resource below. Engaging with these objective and subjective questions daily ensures continuous academic progress and mastery of the 2026-27 curriculum.
A. Check Point and Keywords
1. Give two examples: 1. useful algae 2. exotic breeds of cow 3. viral diseases in cattle 4. improved breeds of hen 5. freshwater fish.
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Answer: 1. Spirulina and Chlorella (also Laminaria). 2. Jersey and Holstein-Friesian. 3. Foot and mouth disease and rinderpest. 4. White Leghorn and Rhode Island Red. 5. Rohu and Catla.
Teacher's Note: Use the key term in your answer.
2. Define: apiculture, cross breeds, exotic breeds, pisciculture, sericulture.
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Answer: Apiculture: rearing of honeybees. Cross breeds: animals produced by crossing an indigenous and an exotic breed. Exotic breeds: breeds brought from other countries. Pisciculture: rearing of fish. Sericulture: rearing of silkworms to obtain silk.
Teacher's Note: Give an example if the question allows.
B. Exercise
(i) Microorganisms used in the tobacco industry: (a) bacteria (b) fungi (c) virus (d) none
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Answer: (a) Bacteria (they help in curing tobacco leaves).
Teacher's Note: Write a short, clear answer.
(iii) An indigenous breed of cow: (a) Brown Swiss (b) Jersey (c) Karan (d) Red Sindhi
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Answer: (d) Red Sindhi (Brown Swiss and Jersey are exotic).
Teacher's Note: Remember this for your exam.
(iv) Feeds with more roughage: (a) rice (b) barley (c) hay (d) husk
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Answer: (c) Hay.
Teacher's Note: Learn this point and write it in your own words.
(v) Rearing of honeybees is called (a) apiculture (b) sericulture (c) pisciculture (d) agriculture
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Answer: (a) Apiculture.
Teacher's Note: Use the key term in your answer.
7. Fill in the blanks: 1. Streptomycin is obtained from ____. 2. ____ bacteria are found in the root nodules of leguminous plants. 3. ____ and ____ are edible fungi. 4. Teak and shisham wood are used for making ____. 5. The ____ lives on mulberry plants.
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Answer: 1. bacteria (Streptomyces); 2. Rhizobium; 3. Mushroom and yeast (also morel); 4. furniture; 5. silkworm.
Teacher's Note: Give an example if the question allows.
8. True or False: 1. Chloromycin is obtained from algae. 2. Agar is prepared from red algae. 3. Iodine is extracted from fungi. 4. Plants provide us nitrogen gas. 5. Vegetables provide vitamins and minerals. 6. Hilsa and tuna are kinds of honeybee.
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Answer: 1. False (from bacteria); 2. True; 3. False (from algae); 4. False (they give oxygen); 5. True; 6. False (they are fish).
Teacher's Note: Write a short, clear answer.
9. Very short: 1. A fungus rich in carbohydrates, proteins and fats. 2. Two draught animals. 3. The architect of the white revolution. 4. A bacterial disease of sheep and goats. 5. The feed of poultry birds.
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Answer: 1. Mushroom. 2. Bullock and camel (also horse). 3. Dr Verghese Kurien. 4. Anthrax. 5. Grains such as maize and millets, with kitchen waste and special poultry feed.
Teacher's Note: Remember this for your exam.
C. Short and Long Answers
1. Three antibiotics obtained from bacteria.
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Answer: Streptomycin, chloromycin (chloramphenicol) and erythromycin.
Teacher's Note: Learn this point and write it in your own words.
2. Uses of diatoms.
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Answer: Diatomite is used in filtering, as an insulator, in polishing and in making toothpaste, paints and dynamite.
Teacher's Note: Use the key term in your answer.
3. Write a short note on the white revolution.
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Answer: The white revolution (Operation Flood) in India was a big increase in milk production started in 1970 under Dr Verghese Kurien. It made India one of the largest producers of milk and gave farmers a steady income.
Teacher's Note: Give an example if the question allows.
4. Differentiate: (a) indigenous and exotic breeds (b) roughage and concentrate (c) freshwater and marine fish.
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Answer:
| Pair | Difference |
|---|---|
| Indigenous and exotic | Indigenous breeds belong to our country, such as Sahiwal, and resist disease; exotic breeds come from other countries, such as Jersey, and give more milk. |
| Roughage and concentrate | Roughage is fibre-rich, as in hay and straw; concentrate is rich in protein and energy, as in oilseed cake and grains. |
| Freshwater and marine fish | Freshwater fish live in rivers and ponds, such as Rohu; marine fish live in the sea, such as tuna and hilsa (migrates). |
Teacher's Note: Write a short, clear answer.
5. Five products obtained from plants.
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Answer: Food grains, vegetables and fruits, timber, medicines, rubber, fibres such as cotton and jute, oils and spices.
Teacher's Note: Remember this for your exam.
1. Define pisciculture, apiculture and sericulture.
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Answer: Pisciculture is rearing of fish; apiculture is rearing of honeybees for honey and wax; sericulture is rearing of silkworms for silk.
Teacher's Note: Learn this point and write it in your own words.
2. Describe the life cycle of the silkworm.
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Answer: It has four stages: egg (laid by the female moth on mulberry leaves), larva (the silkworm, which eats mulberry leaves and grows), pupa (the larva spins a cocoon of silk thread around itself), and adult moth (emerges from the cocoon). For silk, the cocoons are boiled to unwind the thread.
Teacher's Note: Remember the order: egg, larva, pupa, adult.
3. How is algae useful?
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Answer: Algae make oxygen by photosynthesis and are food for fish. Spirulina is a protein-rich food, agar from red algae is used in labs and in food, algin from brown algae is used in ice-cream and cosmetics, iodine comes from seaweeds, and algae are used as manure and in sewage treatment.
Teacher's Note: Give an example if the question allows.
4. How are fungi and bacteria useful?
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Answer: Bacteria: make curd from milk, fix nitrogen (Rhizobium), decompose waste, and give antibiotics such as streptomycin. Fungi: yeast is used in baking and brewing, mushrooms are food, Penicillium gives the antibiotic penicillin, and fungi decompose dead matter.
Teacher's Note: Write a short, clear answer.
5. Two diseases of cattle and poultry with causes and symptoms.
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Answer: Foot and mouth disease (virus): fever, blisters in the mouth and feet. Anthrax (bacteria): high fever and sudden death. Ranikhet disease of poultry (virus): cough, difficulty in breathing and greenish diarrhoea. Fowl pox (virus): wart-like marks on the comb and face.
Teacher's Note: Remember this for your exam.
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All Chapters Practice Sheet and Solutions for Class 8 Science
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FAQs
You can download the teacher-verified PDF for CBSE Class 8 Science Useful Microorganisms Animals and Plants Worksheet Set 09 from StudiesToday.com. These practice sheets for Class 8 Science are designed as per the latest CBSE academic session.
Yes, our CBSE Class 8 Science Useful Microorganisms Animals and Plants Worksheet Set 09 includes a variety of questions like Case-based studies, Assertion-Reasoning, and MCQs as per the 50% competency-based weightage in the latest curriculum for Class 8.
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