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What are the General Instructions for CBSE SCIENCE – Code no. 086. SAMPLE QUESTION PAPER CLASS – X (2026)?
The General Instructions from the CBSE Sample Question Paper for Science (Code 086), Class X (2025-26): (i) This question paper consists of 39 questions across 3 sections: Section A (Biology), Section B (Chemistry), Section C (Physics). (ii) All questions are compulsory. (iii) Internal options are pRead more
The General Instructions from the CBSE Sample Question Paper for Science (Code 086), Class X (2025-26):
(i) This question paper consists of 39 questions across 3 sections: Section A (Biology), Section B (Chemistry), Section C (Physics).
(ii) All questions are compulsory.
(iii) Internal options are provided in some questions.
(iv) Use neat and properly labelled diagrams, wherever required.
(v) The total time allowed is 3 hours, and the maximum marks are 80.
See lessCBSE sample paper 2026 Exam Class 10
Yes! CBSE Class 10 Sample Paper 2026 is out! Download it now from the official CBSE website or Tiwari Academy — your best preparation partner. Prepare smartly: Get subject-wise PDFs for Science, Maths, English, SST, and Hindi with complete solutions and marking schemes. Stay updated with Tiwari AcadRead more
Yes! CBSE Class 10 Sample Paper 2026 is out!
Download it now from the official CBSE website or Tiwari Academy — your best preparation partner.
Prepare smartly:
Be consistent, revise regularly, and keep using Tiwari Academy for notes, extra questions, and revisions.
See lessUnderstand the pattern, time management, and answer presentation — that’s the real key to scoring 95%+ in 2026!
How many chambers are there in the heart of the following organisms? How is mixing of oxygenated and deoxygenated blood prevented in their body? (i) Fishes (ii) Humans
Fish have a two-chambered heart (one atrium and one ventricle). Blood flows once through the heart in a single circulation, and oxygenated and deoxygenated blood mix. Humans, however, have a four-chambered heart (two atria and two ventricles), completely separating oxygenated and deoxygenated blood.Read more
Fish have a two-chambered heart (one atrium and one ventricle). Blood flows once through the heart in a single circulation, and oxygenated and deoxygenated blood mix.
See lessHumans, however, have a four-chambered heart (two atria and two ventricles), completely separating oxygenated and deoxygenated blood. This double circulation ensures efficient oxygen transport throughout the body. Hence, mixing is prevented in humans but not in fishes due to differences in heart structure.
Explain the mechanism by which the water is transported in plants?
In plants, water moves through the xylem vessels from roots to leaves by the transpiration pull mechanism. Evaporation of water from leaf surfaces creates a negative pressure that pulls water upward. Cohesion between water molecules, adhesion to xylem walls, and capillary action together maintain aRead more
In plants, water moves through the xylem vessels from roots to leaves by the transpiration pull mechanism. Evaporation of water from leaf surfaces creates a negative pressure that pulls water upward. Cohesion between water molecules, adhesion to xylem walls, and capillary action together maintain a continuous column of water. This upward movement supplies essential water and minerals for photosynthesis and maintains plant turgidity.
See lessAbout 100 acres of forest land was declared as Natural reserve park. The following organisms were predominant in the Natural reserve park: rabbit, frog, grass, fish, fox, water insects, zebra, peacock, snake, trees, bird, owl, insects, tiger, vulture, duck. Create a food web comprising two separate food chains with different producers by using the above data.
Using the given organisms, two separate food chains can be formed: Grass → Rabbit → Fox → Tiger → Vulture Trees → Insects → Frog → Snake → Owl These food chains are interconnected, forming a food web that shows how energy flows through producers, consumers, and decomposers. Producers like grass andRead more
Using the given organisms, two separate food chains can be formed:
These food chains are interconnected, forming a food web that shows how energy flows through producers, consumers, and decomposers. Producers like grass and trees convert sunlight into food, supporting herbivores, carnivores, and decomposers in maintaining ecological balance.
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