Biology Mock Tests, Practice Questions

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Sample Questions

Class 12 Biology

An ecological pyramid of energy is always upright (never inverted) because:

A Energy decreases at each successive trophic level due to metabolic heat loss, following the second law of thermodynamics

B Producers always have the largest population size in any ecosystem

C Consumers are always larger in body size than producers

D Energy flows from consumers back to producers in a cycle

NEET Biology

In an aquatic ecosystem, the pyramid of biomass is generally:

A Upright

B Inverted

C Spindle-shaped

D Square-based pyramid

Class 12 Biology

RNA interference (RNAi) silences gene expression by:

A Degrading complementary mRNA molecules using double-stranded RNA (dsRNA) that triggers the RISC complex

B Mutating the DNA sequence of the target gene through CRISPR-Cas9 editing

C Blocking ribosome attachment to mRNA by chemically modifying the ribosomal subunits

D Removing introns from pre-mRNA through alternative splicing mechanisms

Class 12 Biology

In Snapdragon (Mirabilis jalapa), crossing a red-flowered plant (WW) with a white-flowered plant (ww) produces pink-flowered F1 offspring. Self-pollinating the F1 produces F2 with a phenotypic ratio of 1:2:1 (red:pink:white). This is an example of:

A Incomplete dominance, where the F1 phenotype is intermediate and the F2 phenotypic and genotypic ratios are both 1:2:1

B Complete dominance, where the red allele completely masks the white allele

C Codominance, where both alleles are fully expressed simultaneously in the heterozygote

D Sean linkage, where the alleles are located on the same chromosome

NEET Biology

Which of the following structures is found in a prokaryotic cell but NOT in a eukaryotic cell?

A Mesosome

B Mitochondria

C Endoplasmic reticulum

D Golgi apparatus

NEET Biology

In the human excretory system, the glomerulus, proximal convoluted tubule (PCT), loop of Henle, distal convoluted tubule (DCT), and collecting duct are all parts of which functional unit?

A Neuron

B Hepatic lobule

C Nephron

D Alveolus

NEET Biology

In the human respiratory system, the functional residual capacity (FRC) represents:

A The volume of air remaining in the lungs after a normal tidal expiration

B The total volume of air in the lungs after maximal inhalation

C The volume of air that can be forcibly exhaled after normal expiration

D The volume of air inhaled during a normal tidal inspiration

NEET Biology

Which enzyme is responsible for joining DNA fragments during replication?

A DNA polymerase

B DNA ligase

C Helicase

D Topoisomerase

About Biology Mock Tests

Biology covers anatomy, genetics, ecology, cell biology, physiology, botany, zoology, and life sciences across all class levels and competitive examinations. Practice with comprehensive biology questions aligned with NCERT curriculum and NEET exam pattern, covering topics from cell structure to ecosystems, human physiology to biotechnology.

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