General Science carries 50 marks in the AISSEE Class 9 paper (25 questions × 2 marks). These 10 MCQs on Cell and Microorganisms are based on the NCERT Class 8 topics listed in the official syllabus.
Quick facts: AISSEE 2027 will be held on Sunday, 31 January 2027. There is no negative marking, so attempt every question. Online applications are open until 2 December 2026 on exams.nta.nic.in/sainik-school-society.
Practice Questions
Q1. Which part of the cell is called its "powerhouse"?
(A) Mitochondria
(B) Nucleus
(C) Vacuole
(D) Ribosome
Q2. Which part controls all activities of the cell?
(A) Nucleus
(B) Chloroplast
(C) Cytoplasm
(D) Cell wall
Q3. Which of these is found in plant cells but not in animal cells?
(A) Cell membrane
(B) Mitochondria
(C) Cell wall
(D) Nucleus
Q4. Who discovered the cell in 1665?
(A) Charles Darwin
(B) Robert Hooke
(C) Gregor Mendel
(D) Robert Brown
Q5. Which green structures in plant cells carry out photosynthesis?
(A) Lysosomes
(B) Chloroplasts
(C) Ribosomes
(D) Mitochondria
Q6. Which microorganism is used to make curd from milk?
(A) Rhizobium
(B) Yeast
(C) Plasmodium
(D) Lactobacillus
Q7. Yeast is used in baking because it produces ________.
(A) oxygen
(B) sugar
(C) nitrogen
(D) carbon dioxide gas
Q8. Malaria is caused by ________ and spread by the female Anopheles mosquito.
(A) a worm
(B) a fungus
(C) Plasmodium (a protozoan)
(D) a virus
Q9. Rhizobium bacteria in the root nodules of pulses help to ________.
(A) produce oxygen
(B) fix atmospheric nitrogen in the soil
(C) make the plant taller
(D) cause disease
Q10. Who discovered the vaccine for smallpox?
(A) Edward Jenner
(B) Louis Pasteur
(C) Alexander Fleming
(D) Robert Koch
Answer Key with Explanations
(A) Mitochondria — Mitochondria release energy from food.
(A) Nucleus — The nucleus contains genetic material and controls the cell.
(C) Cell wall — Plant cells have a rigid cell wall made of cellulose.
(B) Robert Hooke — Robert Hooke saw cells in a thin slice of cork.
(B) Chloroplasts — Chloroplasts contain the green pigment chlorophyll.
(D) Lactobacillus — Lactobacillus bacteria turn milk into curd.
(D) carbon dioxide gas — CO₂ bubbles from yeast make the dough rise.
(C) Plasmodium (a protozoan) — Plasmodium is a protozoan parasite.
(B) fix atmospheric nitrogen in the soil — They convert nitrogen from air into a form plants can use.
(A) Edward Jenner — Edward Jenner developed the smallpox vaccine in 1796.
How did you score?
9–10 correct: excellent — move on to a full-length mock test. 6–8: good — revise the explanations of the questions you missed. Below 6: study this topic again from your NCERT book and retry these questions after two days.
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