Science Class X CBSE board 2025 – last minute revision tips & important instructions

By / February 16, 2025 / 5 minutes of reading

Preparing effectively for the CBSE Class X 2025 Science exam requires a thorough understanding of the syllabus, strategic focus on high-weightage units, and adherence to recommended study practices. Below is a detailed breakdown of the important chapters and topics, along with essential instructions and guidelines to help you excel in your examination.

Unit-Wise Weightage and Key Topics:



1. Chemical Substances – Nature and Behaviour (25 Marks):

Chemical Reactions: Understanding chemical equations, balancing them, and recognizing different types of reactions such as combination, decomposition, displacement, double displacement, precipitation, endothermic, exothermic, oxidation, and reduction.

Acids, Bases, and Salts: Definitions based on H⁺ and OH⁻ ions, general properties, neutralization reactions, pH scale significance, and the preparation and uses of compounds like sodium hydroxide, bleaching powder, baking soda, washing soda, and plaster of Paris.

Metals and Non-Metals: Properties, reactivity series, formation and properties of ionic compounds, basic metallurgical processes, and methods of corrosion prevention.

Carbon Compounds: Covalent bonding, versatility of carbon, homologous series, nomenclature of compounds with functional groups (halogens, alcohols, ketones, aldehydes, alkanes, alkynes), differences between saturated and unsaturated hydrocarbons, chemical properties (combustion, oxidation, addition, substitution), and an overview of ethanol, ethanoic acid, soaps, and detergents.



2. World of Living (25 Marks):

Life Processes: Fundamental concepts of nutrition, respiration, transport, and excretion in plants and animals.

Control and Coordination: Tropic movements in plants, introduction to plant hormones, nervous system functions in animals, types of actions (voluntary, involuntary, reflex), and chemical coordination via animal hormones.

Reproduction: Modes of reproduction in plants and animals (asexual and sexual), reproductive health, family planning methods, and awareness about HIV/AIDS and women’s health during childbearing.

Heredity and Evolution: Principles of heredity, Mendel’s laws of inheritance, and basics of sex determination.



3. Natural Phenomena (12 Marks):

Light Reflection and Refraction: Reflection by curved surfaces, image formation by spherical mirrors, concepts of center of curvature, principal axis, principal focus, focal length, mirror formula, magnification, laws of refraction, refractive index, refraction by spherical lenses, lens formula, and power of lenses.

The Human Eye and the Colourful World: Functioning of the human eye, vision defects and their corrections, applications of spherical mirrors and lenses, refraction through prisms, dispersion, scattering of light, and related daily life applications.



4. Effects of Current (13 Marks):

Electricity: Concepts of electric current, potential difference, Ohm’s law, resistance, resistivity, factors affecting resistance, series and parallel combinations of resistors, heating effects of electric current, and electric power calculations.

Magnetic Effects of Current: Magnetic fields and field lines, magnetic effects of current-carrying conductors, coils, solenoids, force on current-carrying conductors, Fleming’s left-hand rule, and basics of direct and alternating current, including domestic electric circuits.



5. Natural Resources (5 Marks):

Our Environment: Ecosystem dynamics, environmental issues, ozone layer depletion, waste management solutions, and differentiation between biodegradable and non-biodegradable substances.




Study Guidelines and Instructions:

Study Guidelines and Instructions:



Prioritize High-Weightage Units: Allocate more study time to units like “Chemical Substances – Nature and Behaviour” and “World of Living,” as they carry the most marks.

Master NCERT Textbook: Thoroughly read and understand each chapter, solve all in-text and end-of-chapter questions, and pay special attention to key concepts and solved examples.

Regular Practice of Numerical Problems: Dedicate time daily to practice numerical problems, especially in Physics and Chemistry, focusing on units, conversions, and correct application of formulas.

Revise Diagrams Frequently: Practice drawing and labeling diagrams accurately, as they are crucial in subjects like Biology and Physics.

Understand and Memorize Formulas and Derivations: Create a list of important formulas and derivations, review them regularly, and understand the logic behind each step.

Solve Previous Years’ Papers: This will familiarize you with the exam pattern, question types, and help in time management.

Effective Time Management: Develop a study schedule that includes dedicated time for each unit, regular revisions, and breaks to avoid burnout.

Stay Calm and Confident: Maintain a positive attitude, practice relaxation techniques, and ensure adequate rest before the exam.


Here are 10 important topics and long-answer type questions for Class X (2025) Biology that may be expected in exams. These questions are based on common topics in the CBSE/ICSE or similar curricula:



1. Photosynthesis
   – Explain the process of photosynthesis in plants. Include the chemical equation, the role of chlorophyll, and the importance of sunlight. How do factors like light intensity, carbon dioxide concentration, and temperature affect the rate of photosynthesis?



2. Respiration
   – Describe the process of aerobic and anaerobic respiration. Compare the two processes and explain their significance in living organisms. Include the chemical equations for both types of respiration.



3. Human Digestive System
   – Explain the human digestive system with a well-labeled diagram. Describe the role of each organ (mouth, stomach, small intestine, liver, pancreas, etc.) in the digestion and absorption of food.



4. Circulatory System
   – Describe the structure and function of the human heart. Explain the process of double circulation in humans. How does the circulatory system help in the transportation of oxygen, nutrients, and waste materials?



5. Nervous System
   – Explain the structure and function of the human nervous system. Describe the role of neurons, synapses, and the brain in coordinating body activities. How do reflex actions work? Provide an example.


6. Reproduction
   – Compare and contrast asexual and sexual reproduction. Explain the process of reproduction in flowering plants, including pollination, fertilization, and seed formation. How does human reproduction occur?


7. Heredity and Evolution
   – Explain Mendel’s laws of inheritance with suitable examples. How do traits get expressed in organisms? Discuss the role of DNA and chromosomes in heredity. Also, briefly explain the theory of evolution by natural selection.

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8. Excretory System
   – Describe the structure and function of the human excretory system. Explain the process of urine formation in the kidneys. How do kidneys help in maintaining homeostasis in the body?



9. Control and Coordination in Plants
   – Explain how plants coordinate and respond to their environment. Discuss the role of plant hormones like auxins, gibberellins, and cytokinins. Provide examples of tropic movements in plants.



10. Environmental Management
   – Discuss the importance of sustainable management of natural resources. Explain the role of forests and water resources in maintaining ecological balance. How can we reduce our ecological footprint?


These questions cover a wide range of topics and are designed to test your understanding, analytical skills, and ability to explain concepts in detail. Make sure to practice diagrams and labeled explanations wherever necessary!


By focusing on these key areas and adhering to the guidelines, you can enhance your preparation and perform confidently in your CBSE Class X Science examination.

Wish you All the best !

Vikrant Gupta

CEO, Supreme Education

www.supremetutorials.in

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Class X English  CBSE 2025 last minute revision & Preparation tips

By / February 14, 2025 / 9 minutes of reading

Hey all Champs & future builder as you are going to attempt your CBSE Board exam 2025 so it is very necessary and need to revise your all the syllabus well.

1. Tenses

Q1: Fill in the blanks with the correct form of the verb:

1. She _____ (go) to the market yesterday. (went)

2. By next year, he _____ (complete) his studies. (will have completed)

3. They _____ (play) football since morning. (have been playing)

English literature Important Questions

2. Modals (Can, Could, May, Might, Must, Should, Would, Ought to, etc.)

Q2: Choose the correct modal:

1. You _____ wear a seatbelt while driving. (must)

2. He _____ speak five languages. (can)

3. We _____ leave early to catch the train. (should)

3. Passive Voice

Q3: Rewrite the following sentences in passive voice:

1. She writes poems. (Poems are written by her.)

2. They will finish the project next week. (The project will be finished by them next week.)

3. The chef is preparing a special dish. (A special dish is being prepared by the chef.)

4. Reported Speech (Statements, Questions, Commands, and Requests)

Q4: Convert into indirect speech:

1. He said, “I am reading a book.” (He said that he was reading a book.)

2. She asked, “Where are you going?” (She asked where I was going.)

3. The teacher said, “Work hard.” (The teacher advised us to work hard.)

5. Subject-Verb Concord

Q5: Fill in the blanks with the correct verb form:

1. Neither of the boys _____ (is/are) coming today. (is)

2. The bouquet of flowers _____ (smell/smells) fresh. (smells)

3. One of my friends _____ (have/has) won the lottery. (has)

6. Determiners (Articles, Quantifiers, Possessives, etc.)

Q6: Fill in the blanks with appropriate determiners:

1. There isn’t _____ milk left. (any)

2. She adopted _____ dog from the shelter. (a)

3. I need _____ information about the event. (some)

English literature Questions for CBSE board 2025

7. Clauses (Noun, Adjective, Adverb)

Q7: Identify the clause and its type:

1. I know that she is honest. (Noun clause)

2. The book that you gave me is interesting. (Adjective clause)

3. She will come if you invite her. (Adverb clause of condition)

8. Gap Filling (Cloze Passages with one word missing)

Q8: Complete the passage with suitable words:

The earth _____ (1) warming at a rapid pace. Scientists believe that if this trend continues, the consequences _____ (2) be severe. We must act now _____ (3) reduce pollution.

(1) is; (2) will; (3) to

9. Editing and Omission (Error Correction)

Q9: Correct the errors in the passage:

She was reading a book when the doorbell ring. She get up and open the door.

(ring → rang; get → got; open → opened)

10. Sentence Transformation (Rearranging or Transformation of Sentences)

Q10: Rewrite the sentences as directed:

1. She sings very well. (Change into interrogative) – (Does she sing very well?)

2. He is too weak to walk. (Remove ‘too’) – (He is so weak that he cannot walk.)

3. She said, “I can solve this problem.” (Change into passive voice) – (She said that the problem could be solved by her.)

Would you like more practice exercises or explanations for any of these topics? Click here

The grammar portion for Class 10 CBSE typically includes the following topics in addition to what we’ve covered. Here’s a more exhaustive question-answer series for all grammar topics, excluding literature:

1. Tenses (Covered Above)

2. Modals (Covered Above)

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3. Subject-Verb Concord (Covered Above)

4. Reported Speech (Covered Above)

5. Passive Voice (Covered Above)

6. Determiners (Covered Above)

7. Clauses (Covered Above)

8. Gap Filling (Covered Above)

9. Editing and Omission (Covered Above)

10. Sentence Transformation (Covered Above)

11. Rearranging Sentences (Jumbled Sentences)

Q1: Rearrange the following jumbled words to form meaningful sentences:

1. is / honesty / policy / the / best. (Honesty is the best policy.)

2. the / she / library / to / went / books / return / to. (She went to the library to return books.)

3. team / won / match / the / easily / the. (The team won the match easily.)

12. Prepositions

Q2: Fill in the blanks with suitable prepositions:

1. She is fond _____ chocolates. (of)

2. He will arrive _____ Monday. (on)

3. The book is lying _____ the table. (on)

13. Conjunctions

Here are the answers for all the grammar questions provided earlier. The answers are arranged according to the topics for Class 10 CBSE Grammar.

Q3: Fill in the blanks with suitable conjunctions:

1. I was tired _____ I went to bed early. (so)

2. She did not come _____ she was unwell. (because)

3. Work hard _____ you will not pass. (or)

14. Phrasal Verbs

Q4: Fill in the blanks with the correct phrasal verb:

1. She _____ (looked after/turned down) the proposal. (turned down)

2. He _____ (came across/ran into) his old friend. (came across)

3. The firemen _____ (put out/take off) the fire quickly. (put out)

15. Sentence Transformation (Advanced)

Q5: Rewrite the following sentences as directed:

1. The boy is too short to reach the shelf. (Remove ‘too’)

(The boy is so short that he cannot reach the shelf.)

2. He is very honest. (Change into exclamatory)

(How honest he is!)

3. The car is expensive. (Change into negative without changing the meaning)

(The car is not cheap.)

16. Active and Passive Voice (Advanced)

Q6: Change the voice:

1. They are completing the project. (The project is being completed by them.)

2. She had written a letter. (A letter had been written by her.)

3. The teacher will announce the results tomorrow. (The results will be announced by the teacher tomorrow.)

17. Dialogue Completion

Q7: Complete the following dialogues:

Father: Where were you yesterday?

Son: I _____ (go) to the library to study. (went)

Shopkeeper: What would you like to buy?

Customer: I _____ (need) a packet of sugar. (need)

18. Sentence Reordering

Q8: Rearrange the words to form meaningful sentences:

1. has / the / she / homework / finished. (She has finished the homework.)

2. festival / celebrated / is / the / enthusiasm / with / great. (The festival is celebrated with great enthusiasm.)

Here are some unique, plagiarism-free, and student-friendly instructions for attempting the Class X English question paper:

Smart Tips for Excelling in Your Class X English Exam

Before You Begin:

  1. Read All Instructions Carefully: Take a minute to go through the instructions on the question paper. Understand the word limits, marking pattern, and how questions are distributed.
  2. Use the Reading Time Wisely: Don’t jump straight into writing. Use the given reading time to scan through the entire paper, understand the questions, and decide which sections to tackle first.

While Attempting the Paper:

1. Reading Section (Unseen Passages)

  • Read with Focus: Don’t rush. Read the passage carefully, grasp the core idea, and highlight key points if allowed.
  • Answer from the Text: Stick to the facts given in the passage. Avoid adding personal opinions or external knowledge.
  • Look for Keywords: Identify important words in the question and find them in the passage to locate answers quickly.

2. Writing Section (Letter, Article, Story Writing, etc.)

  • Follow the Correct Format: Every writing task—whether a letter, article, or report—has a specific structure. Make sure you get it right.
  • Be Clear and Concise: Use simple, clear language. Avoid overly complicated sentences, and make sure your ideas flow logically.
  • Stick to the Word Limit: Writing more doesn’t mean scoring more. Stay within the prescribed word count to save time and avoid losing marks.

3. Grammar Section

  • Read Questions Twice: Grammar questions often test your attention to detail. Read carefully to understand exactly what’s being asked.
  • Apply Rules, Not Guesswork: Stick to the grammar rules you’ve learned—whether it’s subject-verb agreement, tenses, or sentence transformation.
  • Cross-Check Answers: If time allows, revisit this section to double-check tricky answers.

4. Literature Section (Prose, Poetry, and Drama)

  • Understand the Question First: Don’t rush into writing. Take a moment to figure out what the question is really asking—whether it’s about a character, theme, or literary device.
  • Write with Clarity: Explain your ideas clearly and connect them with the text.
  • Use Short Quotes (if possible): Including relevant quotes can strengthen your answer. Just make sure you remember them accurately.

Time Management & Presentation Tips:

  • Plan Your Time: Allocate specific time blocks for each section. Don’t get stuck on one question for too long.
  • Tackle High-Scoring Questions First: Start with the questions you are most confident about, especially long-answer ones.
  • Save Time to Review: Set aside at least 10-15 minutes at the end to go through your answers, correct errors, and ensure your handwriting is legible.

Final Words: Stay calm, write neatly, and keep your answers well-organized. Confidence and clarity can make a big difference!

For Answersheet go on the next page

Pages: 1 2
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