NEET · Biology doubts
247 doubts found
What is the difference between inspiration and expiration?
In inspiration the diaphragm contracts and chest volume rises to pull air in; in expiration it relaxes and air is pushed out.
How is Body Fluids & Circulation tested in NEET, and what should I focus on?
Prioritise the core ideas: Double circulation, Heart chambers, Blood components.
What is the difference between ureotelic and uricotelic?
Ureotelic animals (mammals) excrete urea; uricotelic animals (birds, reptiles) excrete uric acid to save water.
How is Neural Control & Coordination tested in NEET, and what should I focus on?
Prioritise the core ideas: Neuron, Nerve impulse, Reflex arc.
What is the difference between insulin and glucagon?
Insulin lowers blood glucose by promoting storage; glucagon raises it by releasing stored glucose — they are antagonists.
What is the difference between homozygous and heterozygous?
Homozygous means two identical alleles (TT or tt); heterozygous means two different alleles (Tt).
What is the difference between transcription and translation?
Transcription makes mRNA from DNA in the nucleus; translation makes protein from mRNA at the ribosome.
How is Evolution tested in NEET, and what should I focus on?
Prioritise the core ideas: Natural selection, Variation and adaptation, Hardy–Weinberg principle.
What is the difference between active immunity and passive immunity?
Active immunity is made by your own body (vaccine, infection) and lasts long; passive immunity is borrowed antibodies (mother's milk, antivenom) and is short-lived.
What is the difference between menstrual phase and ovulation?
The menstrual phase is the shedding of the uterine lining at the cycle's start; ovulation is the release of the egg around mid-cycle.
What is the difference between restriction enzyme and DNA ligase?
A restriction enzyme cuts DNA at specific sites; DNA ligase joins DNA fragments together — the scissors and the glue.
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).