Life Processes — Class 10 MCQs with Answers
Class 10 CBSE Science (Biology) · Chapter 5
90 practice questions · 30 Easy · 30 Medium · 30 Hard · Updated
Practise the most important Class 10 CBSE Science (Biology) questions from Chapter 5, "Life Processes". You get 9 timed quizzes made from 90 NCERT-based MCQs, with answers and explanations. The questions are split into 30 Easy, 30 Medium and 30 Hard. Warm up on the basics, then move on to the exam-level questions that set top scorers in CBSE Board exams and the JEE & NEET foundation years apart.
To score well in "Life Processes", focus on clear concepts in physics, chemistry and biology basics. Each MCQ here is timed and uses exam-style marking (+4 correct, −1 wrong, 0 skipped). This trains you to stay accurate under time pressure, as real papers need. Every question has a short explanation, so a wrong answer becomes a quick lesson. It is the fastest way to fix gaps before a test.
Use this chapter for focused revision. Start with the Easy set to check your basics on Life Processes, then move to Medium and Hard to practise applying them. Your accuracy, streaks and XP save automatically. This chapter also adds to your overall Class 10 Science (Biology) mastery score. 14 sample questions are solved in full below, with the answer and a worked explanation. Sign in free to start practising.
Key concepts: Life Processes (Class 10 Science (Biology))
The processes that together maintain life are nutrition, respiration, transportation and excretion. This chapter follows each through plants and humans, from photosynthesis and the alimentary canal to the double circulation of blood and the working of the nephron.
- Life processes
- The basic functions all living organisms must perform to stay alive — nutrition, respiration, transportation and excretion.
- Autotrophic nutrition
- Making one's own food from simple inorganic substances using sunlight, as green plants do in photosynthesis.
- Photosynthesis
- The conversion of carbon dioxide and water into glucose and oxygen using sunlight captured by chlorophyll.
- Stomata
- Tiny pores on the leaf surface, opened and closed by guard cells, through which gases are exchanged and water vapour is lost.
Life Processes — important questions & MCQs with answers (Class 10 Science (Biology))
14 solved questions from this chapter's difficulty levels, each with its answer and explanation. The other 76 are timed and scored when you sign in.
- Q1Easy
Which gas is released by green plants during photosynthesis?
A.Carbon dioxideB.HydrogenC.NitrogenD.Oxygen✓ CorrectAnswer: D. Oxygen
Explanation: Photosynthesis: 6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂. Oxygen is the by-product.
- Q2Easy
Aerobic respiration produces:
A.Lactic acidB.Ethanol + CO₂C.CO₂ + H₂O + ATP✓ CorrectD.Only ATPAnswer: C. CO₂ + H₂O + ATP
Explanation: Glucose + O₂ → CO₂ + H₂O + energy (ATP). Anaerobic gives lactic acid (in muscles) or ethanol (in yeast).
- Q3Easy
How many chambers does the human heart have?
A.2B.4✓ CorrectC.3D.5Answer: B. 4
Explanation: A human heart has two atria and two ventricles — four chambers total — unlike a frog's three-chambered heart, which is where the 3-chamber distractor comes from.
- Q4Easy
Photosynthesis produces:
A.Starch and CO₂B.CO₂ and H₂OC.Glucose and O₂✓ CorrectD.Only waterAnswer: C. Glucose and O₂
Explanation: Photosynthesis combines CO₂ and H₂O using light energy to form glucose (C₆H₁₂O₆) and release O₂ as a by-product — CO₂ and H₂O are the reactants consumed, not the products formed.
- Q5Easy
In plants, water is transported by:
A.Xylem✓ CorrectB.PhloemC.Roots onlyD.Leaves onlyAnswer: A. Xylem
Explanation: Xylem is a network of tube-like cells that carries water and dissolved minerals upward from roots to leaves; phloem instead carries manufactured food.
- Q6Easy
Removal of metabolic wastes from the body is:
A.DefecationB.EgestionC.DigestionD.Excretion✓ CorrectAnswer: D. Excretion
Explanation: Excretion is the removal of metabolic wastes produced inside the body, unlike egestion, which removes undigested food, or digestion, which breaks food down.
- Q7Medium
Photosynthesis primarily occurs in the:
A.MitochondriaB.NucleusC.Endoplasmic reticulumD.Chloroplasts✓ CorrectAnswer: D. Chloroplasts
Explanation: Chloroplasts hold the pigment chlorophyll that traps light energy for photosynthesis; mitochondria, the tempting distractor, are the site of respiration instead.
- Q8Medium
Gas exchange in lungs occurs in:
A.LarynxB.BronchiC.TracheaD.Alveoli✓ CorrectAnswer: D. Alveoli
Explanation: Gas exchange happens in the alveoli, tiny air sacs with thin, moist walls surrounded by blood capillaries that let O₂ and CO₂ diffuse quickly across.
- Q9Medium
In plants, water is transported upwards through the:
A.PhloemB.Xylem✓ CorrectC.CambiumD.CortexAnswer: B. Xylem
Explanation: Xylem transports water and minerals from roots to leaves; phloem transports food.
- Q10Medium
Balanced equation for photosynthesis:
A.CO₂ + H₂O → CO + H₂O₂B.6 CO₂ + 6 H₂O →(light) C₆H₁₂O₆ + 6 O₂✓ CorrectC.6 O₂ + 6 H₂O → C₆H₁₂O₆D.Glucose → CO₂ + H₂OAnswer: B. 6 CO₂ + 6 H₂O →(light) C₆H₁₂O₆ + 6 O₂
Explanation: In photosynthesis, 6 CO₂ and 6 H₂O react using light energy to form one glucose (C₆H₁₂O₆) molecule and 6 O₂.
- Q11Medium
Lymph differs from blood in lacking:
A.PlasmaB.Red blood cells✓ CorrectC.White blood cellsD.WaterAnswer: B. Red blood cells
Explanation: Lymph is a colourless fluid formed from plasma that filters out of capillaries; it lacks red blood cells but still carries white blood cells.
- Q12Hard
End-products of digestion of proteins are:
A.Amino acids✓ CorrectB.GlucoseC.Fatty acidsD.GlycerolAnswer: A. Amino acids
Explanation: Proteins are digested by proteases into amino acids, the absorbable end-product.
- Q13Hard
Why do muscles cramp during heavy exercise?
A.Excess oxygen accumulatesB.Lactic acid builds up due to anaerobic respiration✓ CorrectC.Glucose is depleted entirelyD.Nerve cells ruptureAnswer: B. Lactic acid builds up due to anaerobic respiration
Explanation: When O₂ supply is insufficient, muscle cells respire anaerobically and produce lactic acid, causing cramps.
- Q14Hard
Why is the human circulatory system called "double circulation"?
A.Because it has two heartsB.Because veins and arteries cross twiceC.Because there are two types of bloodD.Because blood flows twice through the heart per cycle✓ CorrectAnswer: D. Because blood flows twice through the heart per cycle
Explanation: Blood passes through the heart twice in one complete cycle: once via the pulmonary (heart→lungs→heart) and once via the systemic (heart→body→heart) circuit.
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Start this chapter free →Life Processes — FAQs
What are the key concepts in Class 10 Science (Biology) Life Processes?+
The processes that together maintain life are nutrition, respiration, transportation and excretion. This chapter follows each through plants and humans, from photosynthesis and the alimentary canal to the double circulation of blood and the working of the nephron. Key ideas include Life processes, Autotrophic nutrition, Photosynthesis, Stomata.
What does Class 10 Science (Biology) Chapter 5 (Life Processes) cover on XamBaaz?+
It has 90 NCERT-based MCQs on "Life Processes": 30 Easy, 30 Medium and 30 Hard. Together they make 9 timed quizzes, and you never get the same set twice. Every question has an instant explanation. They help you prepare for CBSE Board exams and the JEE & NEET foundation years.
Are these "Life Processes" questions free to practise?+
Yes. Sign in with Google to practise "Life Processes" free. Full unlimited access is ₹999/year on a launch offer until 1 December 2026. No chapter is charged separately.
How should I revise "Life Processes" for the exam?+
Start with the Easy quiz to check your basics, then try Medium and Hard to practise applying them. There are 9 timed quizzes on this chapter, so you can come back for a fresh set instead of one you have seen. Read each explanation, retry the questions you miss, and track your accuracy until it stays high.
Are these "Life Processes" MCQs available with answers?+
Yes. 14 sample questions are shown here in full, each with the correct option and a step-by-step "Why" explanation. Sign in free with Google to start practising, with instant scoring.
Is there negative marking in the "Life Processes" quizzes?+
Yes. The timed quizzes use exam-style marking: +4 for a right answer, −1 for a wrong one and 0 for a skip. MHT-CET and CBSE board papers have no negative marking. Our mocks for those are scored their way.
What are the important questions from Life Processes (Class 10 Science (Biology))?+
The questions that matter most test Life processes, Autotrophic nutrition, Photosynthesis, Stomata. This page shows 14 solved important MCQs with answers and explanations; all 90 questions on the chapter are available as timed quizzes once you sign in.
Is there an online quiz for Life Processes?+
Yes — Class 10 Science (Biology) Life Processes has timed online quizzes at Easy, Medium and Hard levels, with instant scoring and a worked explanation on every question. The first quiz on the chapter is free.