NEET · Biology doubts
340 doubts found
What does “Nitrogenous waste” actually mean in Excretory Products & Elimination, and why does it matter for NEET?
humans mainly excrete urea, so we are ureotelic.
What does “Reflex arc” actually mean in Neural Control & Coordination, and why does it matter for NEET?
a fast, involuntary response routed through the spinal cord without waiting for the brain.
What does “Thyroxine” actually mean in Chemical Coordination (Endocrine System), and why does it matter for NEET?
the thyroid hormone that controls the body's metabolic rate; it needs iodine.
What does “Incomplete dominance” actually mean in Principles of Inheritance & Variation, and why does it matter for NEET?
heterozygotes show a blended, intermediate phenotype (red × white → pink).
What does “Transcription” actually mean in Molecular Basis of Inheritance, and why does it matter for NEET?
copying a gene's DNA into messenger RNA in the nucleus.
What does “Hardy–Weinberg principle” actually mean in Evolution, and why does it matter for NEET?
allele frequencies in a large, undisturbed population stay constant — no evolution.
What does “Antibodies” actually mean in Human Health & Disease, and why does it matter for NEET?
protein molecules made by B-lymphocytes that bind and neutralise specific antigens.
What does “Fertilisation” actually mean in Human Reproduction & Reproductive Health, and why does it matter for NEET?
the fusion of sperm and ovum, which happens in the ampulla of the fallopian tube, not the uterus.
What does “PCR (polymerase chain reaction)” actually mean in Biotechnology & its Applications, and why does it matter for NEET?
a technique that makes millions of copies of a DNA segment using primers and heat-stable Taq polymerase.
What does “Trophic levels” actually mean in Ecosystem & Ecology, and why does it matter for NEET?
the feeding positions in a food chain: producers, primary consumers, secondary consumers, and decomposers.
What does “Five-kingdom system” actually mean in Biological Classification, and why does it matter for NEET?
Whittaker grouped life into Monera, Protista, Fungi, Plantae and Animalia using cell structure and mode of nutrition.
What does “Modifications of organs” actually mean in Morphology of Flowering Plants, and why does it matter for NEET?
roots, stems and leaves can be modified for storage, support, climbing or protection while keeping their defining features.
What does “Xylem and phloem” actually mean in Anatomy of Flowering Plants, and why does it matter for NEET?
xylem carries water and minerals upward (its conducting cells are dead), while phloem carries food both ways (its cells are living).
What does “Transpiration pull” actually mean in Transport in Plants, and why does it matter for NEET?
water lost from leaves creates a suction that, thanks to water's cohesion, pulls a continuous column up the xylem.
What does “Plant hormones” actually mean in Plant Growth & Development, and why does it matter for NEET?
auxins, gibberellins, cytokinins, ethylene and abscisic acid coordinate growth, each with characteristic effects.
What does “Sliding filament theory” actually mean in Locomotion & Movement, and why does it matter for NEET?
muscles contract when thin actin filaments slide over thick myosin filaments, shortening the muscle — powered by ATP and triggered by calcium.
What does “Pollination” actually mean in Sexual Reproduction in Flowering Plants, and why does it matter for NEET?
the transfer of pollen from anther to stigma; it may be self-pollination (same flower/plant) or cross-pollination (different plant).
How do Rhizobium bacteria act as a natural fertiliser for crops?
Rhizobium lives in the root nodules of legumes (peas, beans, gram) in a symbiosis.
I keep getting “Law of dominance” questions wrong in Principles of Inheritance and Variation. What's the trap?
thinking the recessive allele is lost or destroyed in the F1.
I keep getting “DNA double helix” questions wrong in Molecular Basis of Inheritance. What's the trap?
pairing adenine with guanine or cytosine.
What does “Natural selection” actually mean in Evolution, and why does it matter for NEET?
individuals with favourable heritable traits survive and reproduce more, shifting the population over generations.
What does “Myogenic heart and the SAN” actually mean in Body Fluids and Circulation, and why does it matter for NEET?
the sino-atrial node, a patch of heart muscle, is the pacemaker that starts each heartbeat on its own.
I keep getting “Synapse” questions wrong in Neural Control and Coordination. What's the trap?
thinking impulses cross a synapse electrically and in both directions.
What does “Ecological pyramids” actually mean in Ecosystem, and why does it matter for NEET?
pyramids of energy are always upright, but pyramids of number or biomass can be inverted.