List of top Biology Questions

Aestivation of petals in the flower of cotton is correctly shown in
When concentration of carbon dioxide increases in blood, respiration becomes
Brunner?s glands are found in
Which of these is secreted by duodenum?
Enteropeptidase present in ?succus entericus? converts _______.
Which of the following elements is relatively immobile in plants?
In humans, what is the ratio of number of gametes produced from one male primary sex cell to the number of gametes produced from one female primary sex cell ?
The term "glycocalyx" is used for
Meiosis takes place in
The foetal ejection reflex in humans triggers the release of
Cork cambium of dicot stem originates from
A thin film of water covering the soil particles and held strongly by attractive forces is called
Mosses and ferns are
The tendency of population to remain in genetic equilibrium may be disturbed by
Natural reservoir of phosphorus is
Transition state structure of the substrate formed during an enzymatic reaction is
The first stable product of fixation of atmospheric nitrogen in leguminous plants is
Which of the metabolites is common to respiration mediated breakdown of fats, carbohydrates and proteins ?
The figure shows a diagrammatic view of human respiratory system with labels A, B, C and D. Select the option which gives correct identification and main function and/or characteristic.
diagrammatic view of human respiratory system
Figure shows human urinary system with structures labelled A to D. Select option which correctly identifies them and gives their characteristics and/ or functions
human urinary system with structures labelled A to D
Match the name of the animal (Column I) with one characteristics (Column II) and the phylum/class (column III) to which it belongs.
Column IColumn IIColumn III
(1)PetromyzonEctoparasiteCyclostomata
(2)IchthyophisTerrestrialReptilia
(3)LimulusBody covered by chitinous exoskeletonPisces
(4)AdamsiaRadially symmetricalPorifera
Monoecious plant of Chara shows occurrence of
The diagram given here is the standard ECG of a normal person. The P-wave represents the
standard ECG of a normal person
Meiosis takes place in
Variation in gene frequencies within populations can occur by chance rather than by natural selection. This is referred to as