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170 Mizoram MCQ Questions in english हिन्दी

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Autoimmune disease occurs when:

Self-reactive immune response.

Vaccines typically contain:

Antigens or attenuated pathogen — to trigger immune memory.

Antibodies are produced by:

B cells — they release immunoglobulins.

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ATP is composed of adenine, ribose, and:

Three phosphates — energy-rich bonds.

Enzyme activity can be denatured by:

High heat — disrupts protein structure.

Lipids are hydrophobic because of:

Hydrocarbon tails — repel water.

Peptide bonds link:

Amino acids — forming proteins.

Monosaccharides are:

Simple sugars like glucose.

Binomial nomenclature includes:

Genus and species — e.g., Homo sapiens.

Which is not a chordate characteristic?

Exoskeleton — chordates have internal skeleton.

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Phylum Arthropoda is characterized by:

Jointed appendages and exoskeleton.

Which kingdom includes decomposers like mushrooms?

Fungi — absorb nutrients from organic material.

Viruses are classified as:

Acellular — not made of cells.

The ozone layer primarily absorbs:

UV-C/B — protecting organisms from DNA damage.

Rhizobium bacteria in root nodules fix:

Nitrogen — converts atmospheric N₂ to ammonia.

Biomagnification refers to:

Toxin buildup at higher trophic levels.

A keystone species is one that:

Shapes ecosystem structure significantly.

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Primary succession begins with:

Bare rock — lichens and mosses colonize first.

Neurons communicate via:

Electrical and chemical — action potentials + neurotransmitters.

Which organ produces bile?

Liver — bile aids fat digestion.

Which hormone regulates blood glucose levels?

Insulin — lowers blood sugar.

Oxygen is carried in blood by:

Hemoglobin — in red blood cells.

The pacemaker of the heart is the:

SA node — initiates heartbeat.

Conjugation in bacteria involves:

Direct transfer — via pili.

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Antibiotics are ineffective against:

Viruses — they target cellular machinery.

Which virus type carries reverse transcriptase?

Retrovirus — uses reverse transcription (e.g., HIV).

Gram-positive bacteria have:

Thick peptidoglycan layer — retains crystal violet stain.

Bacteria that require oxygen are called:

Aerobes — need O₂ for metabolism.

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