List of top Biology Questions

The picture below shows three different types of plants (marked as P-I, P-II and P-III) which flower on the basis of their critical photoperiod. Now identify these plants (P-I, II and III).
The phase of shortest duration in mitosis is
The pathway of water from soil upto the secondary xylem is
The part of internal ear responsible for hearing is
The outer layer of vacuole is called
The organelles which take part in photo-respiration are
The origin of lateral roots is from
The organ of Corti is a structure present in
The opening of right atrium into right ventricle of human heart is guarded by
The nutritive cells found in seminiferous tubules are
The number of plant species recorded from India, is
The number of nephrons in a kidney is equal to
The number of DNA strands in chromosome at G-stage of cell cycle is
The number of chromosomes in the shoot tip cells of a maize plant is $20$. The number of chromosomes in the microspore mother cells of the same plant shall be
The nucleolus is the site of formation of
The non-mineral elements are
The net electric charge on $DNA$ and histones is
The name virus was given by
The name of the scientist in binomial nomenclature must be printed in
The molecular mass of NaCl as determined by osmotic pressure measurement is
The method to half infertile couples to produce children is called
The membranous cover of the ovum at ovulation is
The mature seeds of plants such as gram and peas, possess no endosperm, because
The male cone of Cycas is made up of a group of
The male gametes of rice plant have $12$ chromosomes in their nucleus. The chromosome number in the female gamete, zygote and the cells of the seedling will be, respectively