NEET doubts
500 doubts found
What is the difference between producers and consumers?
Producers (green plants) make their own food by photosynthesis; consumers eat other organisms for energy.
What is the difference between prokaryotic cell and eukaryotic cell?
Prokaryotic cells (bacteria) have no nucleus or membrane-bound organelles; eukaryotic cells (plants, animals) have a true nucleus and organelles.
What is the difference between DNA and RNA?
DNA is double-stranded with deoxyribose and thymine (stores genes); RNA is single-stranded with ribose and uracil (expresses genes).
What is the difference between chromatid and chromosome?
A chromatid is one half of a duplicated chromosome; the two sister chromatids joined at the centromere form one chromosome.
What are the most common mistakes students make in Photosynthesis in Higher Plants?
the O₂ released in photosynthesis comes from the photolysis of water, not from carbon dioxide.
What is the difference between respiration and combustion?
Both release energy from glucose, but respiration does it in controlled enzyme steps at body temperature, while combustion is a sudden burn.
What is the difference between mechanical digestion and chemical digestion?
Mechanical digestion physically breaks food (chewing, churning); chemical digestion uses enzymes to break molecular bonds.
What is the difference between oxygen transport and carbon dioxide transport?
Oxygen is carried mostly by haemoglobin; carbon dioxide is carried mostly as bicarbonate in the plasma.
What are the most common mistakes students make in Body Fluids & Circulation?
the pulmonary artery is the exception — it carries deoxygenated blood from the heart to the lungs.
What is the difference between renal cortex and renal medulla?
The cortex is the outer kidney region with glomeruli; the medulla is the inner region with the loops that concentrate urine.
What are the most common mistakes students make in Neural Control & Coordination?
the signal crosses a synapse chemically, using neurotransmitters, not as an electric spark.
What is the difference between hormone and enzyme?
A hormone is a chemical messenger carried by blood to a target; an enzyme is a catalyst that speeds a specific reaction where it is made.
What is the difference between incomplete dominance and codominance?
In incomplete dominance the heterozygote is a blend (pink); in codominance both alleles show fully and separately (AB blood group).
What is the difference between purines and pyrimidines?
Purines (adenine, guanine) are double-ring bases; pyrimidines (cytosine, thymine, uracil) are single-ring bases.
What are the most common mistakes students make in Evolution?
natural selection favours the best-adapted to the environment, which is not the same as the physically strongest.
What is the difference between antigen and antibody?
An antigen is a foreign molecule that triggers a response; an antibody is the protein the body makes to bind and neutralise it.
How is Human Reproduction & Reproductive Health tested in NEET, and what should I focus on?
Prioritise the core ideas: Gametogenesis, Menstrual cycle, Fertilisation.
What is the difference between vector (plasmid) and host cell?
A vector (like a plasmid) carries the gene of interest; the host cell (like a bacterium) receives it and expresses the product.
What is the difference between energy flow and nutrient cycling?
Energy flows one-way through the ecosystem and is lost as heat; nutrients (carbon, nitrogen) are recycled repeatedly.
What is the difference between plant cell and animal cell?
A plant cell has a cell wall, chloroplasts and a large vacuole; an animal cell has none of these but has centrioles.
What is the difference between competitive inhibition and non-competitive inhibition?
A competitive inhibitor blocks the active site and can be overcome by more substrate; a non-competitive inhibitor binds elsewhere and cannot.
How is Cell Cycle & Cell Division tested in NEET, and what should I focus on?
Prioritise the core ideas: Phases of the cell cycle, Mitosis, Meiosis.
How do I revise Photosynthesis in Higher Plants quickly before the exam?
One-page summary of Light reactions, Calvin cycle (dark reaction), Chlorophyll, then timed previous-year questions.
How is Respiration in Plants tested in NEET, and what should I focus on?
Prioritise the core ideas: Glycolysis, Aerobic respiration, Fermentation.