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10th Science Guide – Samacheer Kalvi Book Solutions

10th Science guide with Samacheer Kalvi book back solutions, chapter by chapter, as per the 2026-27 textbook.

This page has samacheer kalvi 10th science book solutions for all 23 units of the 2026-27 textbook, from Laws of Motion and Optics to Genetics, Health and Diseases, and Visual Communication. Each question is worked out step by step, so you can follow the reasoning and not just copy the result. Use these 10th science book back answers to check your work after you try the exercises yourself.

Unit 1: Laws of Motion

47 questions in this unit

I. Choose the correct answer

II. Fill in the blanks

III. State whether the following statements are true or false. Correct the statement if it is false

IV. Match the following

V. Assertion & Reasoning

VI. Answer briefly.

VII. Solve the given problems

VIII. Answer in detail.

IX. HOT Questions

Unit 2: Optics

40 questions in this unit

I. Choose the correct answer

II. Fill in the blanks:

III. True or False. If false correct it.

IV. Match the following:

V. Assertion and reasoning type

VI. Answer Briefly

VII. Give the answer in detail

VIII. Numerical Problems:

IX. Higher order thinking (HOT) questions:

Unit 3: Thermal Physics

28 questions in this unit

I. Choose the correct answer

II. Fill in the blanks:

III. State whether the following statements are true or false, if false explain why?

IV. Match the items in column-I to the items in column-II

V. Assertion and reason type questions

VI. Answer in briefly

VII. Numerical problems

VIII. Answer in detail

IX. HOT question

Unit 4: Electricity

39 questions in this unit

I. Choose the best answer

II. Fill in the blanks

III. State whether the following statements are true or false: If false correct the statement.

IV. Match the items in column-I to the items in column-II:

V. Assertion and reason type questions:

VI. Very short answer questions.

VII. Short answer questions

VIII. Long answer questions.

IX. Numerical problems:

X. HOTS:

Unit 5: Acoustics

41 questions in this unit

I. Choose the correct answer

II. Fill up the blanks

III. True or false:- (If false give the reason)

IV. Match the following

V. Assertion and Reason Questions

VI. Answer very briefly

VII. Answer briefly

VIII. Problem Corner

IX. Answer in Detail

X. HOT Questions

Unit 6: Nuclear Physics

74 questions in this unit

I. Choose the correct answer

II. Fill in the blanks

III State whether the following statements are true or false: If false, correct the statement

IV. Match the following

V. Arrange the following in the correct sequence:

VI. Use the analogy to fill in the blank

VII. Numerical problems:

VIII. Assertion and reason type questions:

IX. Answer in one or two word (VSA)

X. Answer the following questions in few sentences.

XI. Answer the following questions in detail.

XII. HOT Questions:

Unit 7: Atoms and Molecules

43 questions in this unit

I. Choose the best answer.

II. Fill in the blanks

III. Match the following

IV. True or False: (If false give the correct statement)

V. Assertion and Reason:

VI. Short answer questions

VII. Long answer questions

VIII. HOT question

IX. Solve the following problems

Unit 8: Periodic Classification of Elements

42 questions in this unit

I. Choose the best answer.

II. Fill in the blanks

III. Match the following

IV. True or False: (If false give the correct statement)

V. Assertion and Reason

VI. Short answer questions

VII. Long answer questions

VIII. HOT questions

Unit 9: Solutions

40 questions in this unit

I. Choose the correct answer.

II. Fill in the blanks

III. Match the following

IV. True or False: (If false give the correct statement)

V. Short answer

VI. Long answer:

VII. HOTS

Unit 10: Types of Chemical Reactions

41 questions in this unit

I. Choose the correct answer.

II. Fill in the blanks

III. Match the following

IV. True or False: (If false give the correct statement)

V. Short answer questions:

VI. Answer in detail

VII. HOT questions

VIII. Solve the following problems

Unit 11: Carbon and its Compounds

40 questions in this unit

I. Choose the best answer.

II. Fill in the blanks

III. Match the following

IV. Assertion and Reason:

V. Short answer questions

VI. Long answer questions

VII. HOT questions

Unit 12: Plant Anatomy and Plant Physiology

35 questions in this unit

I. Choose the correct answer

II. Fill in the blanks.

III. State whether the statements are true or false. Correct the false statement.

IV. Match the following

V. Answer in a sentence

VI. Short answer questions

VII. Long answer questions

VIII. Higher Order Thinking Skills(HOTS)

Unit 13: Structural Organisation of Animals

36 questions in this unit

I. Choose the correct answer

II. Fill in the blanks

III. Identify whether the statements are True or False. Correct the false statement

IV. Match columns I, II and III correctly

V. Answer in a sentence

VI. Short answer questions

VII. Long answer questions

VIII. Higher Order Thinking Skills (HOTS)

IX. Value based questions

Unit 14: Transportation in Plants and Circulation in Animals

63 questions in this unit

I. Choose the correct answer

II. Fill in the blanks

III. Match the following

IV. State whether True or False. If false write the correct statement

V. Answer in a word or sentence

VI. Short answer questions

VII. Give reasons for the following statements

VIII. Long answer questions

IX. Assertion and Reasoning

X. Higher Order Thinking Skills (HOTS)

Unit 15: Nervous System

49 questions in this unit

I. Choose the correct answer

II. Fill in the blanks

III. State whether true or false, if false write the correct statement

IV. Match the following

V. Understand the assertion statement. Justify the reason given and choose the correct choice

VI. Short answer questions

VII. Differentiate between

VIII. Long answer questions

IX. Higher Order Thinking Skills (HOTS)

Unit 16: Plant and Animal Hormones

56 questions in this unit

I Choose the correct answer

II Fill in the blanks

III a) Match Column I with Columns II and III

III b) Match the following hormones with their deficiency states

IV State whether True or false, If false write the correct statement

V Assertion and Reasoning

VI Answer in a word or sentence

VII Short answer questions

VIII. Long answer questions

IX Higher Order Thinking Skills (HOTS)

Unit 17: Reproduction in Plants and Animals

58 questions in this unit

I. Choose the correct answer

II. Fill in the blanks

III. (a) Match the following

III. (b) Match the following terms with their respective meanings

IV. State whether the following statements are True or False. Correct the false statement

V. Answer in a word or sentence

VI. Short answer question

VII. Long answer questions

VIII. Higher Order Thinking Skills (HOTS)

Unit 18: Genetics

43 questions in this unit

I. Choose the correct answer

II. Fill in the blanks

III. Identify whether the statement are True or False. Correct the false statement

IV. Match the following

V. Answer in a sentence

VI. Short answers questions

VII. Long answer questions

VIII. Higher Order Thinking Skills (HOTS)

IX. Value based question

Unit 19: Origin and Evolution of Life

26 questions in this unit

I Choose the correct answer

II Fill in the blanks

III State true or false. Correct the false statements

IV Match the following

V Answer in a word or sentence

VI Short answers questions

VII Long answer questions

IX Higher Order Thinking Skills (HOTS)

Unit 20: Breeding and Biotechnology

57 questions in this unit

I Choose the correct answer

II Fill in the blanks

III State whether true or false. If false, write the correct statement

IV Match the following

V Understand the assertion statement, justify the reason given and choose the correct choice

VI Answer in a sentence

VII Short answers questions

VIII Long answers questions

IX Higher Order Thinking Skills (HOTS)

Coming soon

  • Unit 21: Health and Diseases
  • Unit 22: Environmental Management
  • Unit 23: Visual Communication

New chapters and exercises are added every week.