NEET · Biology doubts
340 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.
I keep getting “Viruses” questions wrong in Biological Classification. What's the trap?
placing viruses inside the five kingdoms.
What is the difference between tendril and spine?
A tendril is a slender coiling structure (modified stem or leaf) for climbing; a spine is a hard pointed structure (often a modified leaf) for protection and reducing water loss.
What is the difference between heartwood and sapwood?
Heartwood is the dark, dead central wood that only supports the tree; sapwood is the lighter outer wood that still conducts water.
What is the difference between osmosis and active transport?
Osmosis moves water passively down a concentration gradient with no energy cost; active transport moves minerals against their gradient and needs ATP.
What is the difference between gibberellin and abscisic acid?
Gibberellin promotes stem elongation, seed germination and bolting; abscisic acid (the 'stress hormone') does the opposite — it enforces dormancy and closes stomata under drought.
What is the difference between cartilage and bone?
Cartilage is soft, flexible connective tissue (nose, ear, joint surfaces); bone is hard, calcified tissue that supports the body and protects organs.
What is the difference between insect-pollinated flower and wind-pollinated flower?
Insect-pollinated flowers are large, colourful, scented and have sticky pollen; wind-pollinated flowers are small and dull with huge amounts of light, dry pollen.
What is the difference between Lactobacillus (curd) and yeast (bread/alcohol)?
Lactobacillus ferments milk sugar into lactic acid, setting milk into curd; yeast ferments sugars into ethanol and CO₂, leavening bread and brewing alcohol.
What does “Sex determination (XX-XY)” actually mean in Principles of Inheritance and Variation, and why does it matter for NEET?
human females are XX and males XY, so the father's sperm (X or Y) decides the child's sex.
What does “lac operon” actually mean in Molecular Basis of Inheritance, and why does it matter for NEET?
in E. coli, lactose switches on the operon by inactivating the repressor so the lactose-digesting genes are transcribed.
How is Evolution tested in NEET, and what should I focus on?
Prioritise the core ideas: Homologous vs analogous organs, Natural selection, Hardy-Weinberg principle.
How is Body Fluids and Circulation tested in NEET, and what should I focus on?
Prioritise the core ideas: Double circulation, Myogenic heart and the SAN, Blood clotting.