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Cell the Unit of Life — NEET Biology MCQs

30 questions written by hand against the NCERT chapter. Every wrong option is explained, not just the right one.

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Sample questions from this chapter

A microscope reveals many adjoining empty chambers in a thin slice of cork. What did Hooke actually observe when he named them cells?
  1. Living protoplasts undergoing division
  2. Cell walls left by dead cork cells ✓
  3. Membrane-bound nuclei inside plant cells
  4. Free-living bacterial cells
Answer: B. Hooke saw the box-like walls of dead cork cells and called the compartments cellulae. The living-cell option tempts because modern diagrams fill each chamber with protoplasm, which his specimen lacked.
Why not A: Cork tissue examined by Hooke was dead, so living contents were no longer visible.
Why not C: Brown described the nucleus much later; Hooke saw chamber boundaries, not nuclear bodies.
Why not D: Leeuwenhoek observed living microscopic organisms, whereas Hooke examined cork tissue.
Two cells have the same volume, but one has numerous surface folds. Which consequence is most direct?
  1. Its cytoplasm becomes membrane-free
  2. It must possess more chromosomes
  3. It has a larger exchange surface without proportionally increasing volume ✓
  4. It can no longer regulate molecular entry
Answer: C. Folding raises surface-area-to-volume ratio and can increase transport capacity. More chromosomes may correlate with neither cell size nor membrane geometry.
Why not A: Folds add plasma-membrane area; they do not remove internal membranes.
Why not B: Chromosome number is species- and cell-type-specific, not set by surface folding.
Why not D: More membrane can support additional transport proteins while selectivity is retained.
A bacterial mutant makes flagellin normally but cannot assemble hook proteins. What phenotype is expected?
  1. Ribosomes change from 70S to 80S
  2. Pili become the main sites of aerobic respiration
  3. The filament cannot couple effectively to the basal motor ✓
  4. The nucleoid becomes enclosed by a nuclear membrane
Answer: C. A bacterial flagellum comprises filament, hook and basal body; without the hook, a filament cannot connect properly to the motor. Pili may resemble short flagella externally, but they do not substitute for motility machinery.
Why not A: Ribosomal sedimentation is unrelated to hook construction.
Why not B: Pili mediate attachment or genetic exchange, not replacement of respiratory membranes.
Why not D: A flagellar assembly defect cannot generate a eukaryotic nuclear envelope.

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Read the chapter first

Every NCERT question in this chapter is solved, free: NCERT solutions — Cell the Unit of Life →

Other NEET Biology chapters

The Living WorldBiological ClassificationPlant KingdomAnimal KingdomMorphology of Flowering PlantsAnatomy of Flowering Plants

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Questions

How many NEET questions are there on Cell the Unit of Life?

This chapter test has 30 questions — 10 easy, 14 medium and 6 hard — all written against the NCERT Class 11 chapter.

Is this NEET Biology chapter test free?

Yes. Every chapter test is free with no login. The only paid thing on the site is the full-length 90-question Biology mock and its all-India rank.

Do the questions explain the wrong options?

Yes — every distractor carries its own explanation naming the specific misconception that makes a student pick it. That is the part most question banks skip, and it is the part that changes your next attempt.