List of top Biology Questions

What is true for "lactational amenorrhea"? (i) It means absence of menstruation. (ii) Ovulation does not occur during the lactational period. (iii) Chances of conception are almost nil upto six months following parturition. (iv) Side effects are almost nil. (v) Contraceptive efficiency reduces after the period of intense lactation. (vi) It is a natural method of contraception. (vii) It increases phagocytosis of sperms.
What is true for an ideal contraceptive ? I. It should be user-friendly. II. It should be easily available. III. It should be ineffective and reversible with least side effects. IV. It should be effective and reversible with least side effects. V. It should interfere with the sexual act of the user.
What is true about "Saheli"? (i) Developed at the $CDRI$, Lucknow (ii) Contains a steroidal preparation (iii) "Once-a-week" pill (iv) Many side effects (v) High contraceptive value (vi) Very few side effects (vii) Low contraceptive value
What is the total number of species present on earth as estimated by Robert May ?
What is the full form of IUDs?
What is the fate of primary xylem in a dicot root showing extensive secondary growth?
What Is The approximate number of muscles present in human body?
What is the annual net primary productivity of whole biosphere ?
What is R. of early stages of germination of castor seed?
What is common to the techniques (i) in vitro fertilisation, (ii) Cryopreservation and (iii) tissue culture ?
What happens when the pacemaker becomes is non-functional?
What is $ANDI$?
What is a tonoplast?
What does the given figure represent?
What are the advantage of gobar gas over conventional utilization?
Wax gland present in the ear canal is called
Watson and Crick $(1953)$ proposed $DNA$ double helix model and won the Nobel Prize; their model of $DNA$ was based on (i) $X$-ray diffraction studies of $DNA$ done by Wilkins and Franklin (ii) Chargaff's base equivalence rule (iii) Griffith's transformation experiment (iv) Meselson and Stahl's experiment.
Water will be absorbed by root hairs when
Water lost in guttation is
Water stomata are found in
Warm blooded animals have larger size in colder areas. It is called
Warburg effect refers to
Walking barefoot on grass makes you liable to get infected with
Vivipary or germination of seed while attached to the plant is seen in
Volkmann's canals connect