Heterophyllous development in response to environment is an example of which of the following phenomena ?

Progestogens alone or in combination with estrogens can be used as a contraceptive in the form of

An example of ex situ conservation is

Which of the following statements are true with reference to the sex-determination in honeybees ?
A. An offspring formed from the union of a sperm and an egg, develops as a female (queen or worker).
B. An unfertilized egg develops as a male by parthenogenesis.
C. A male has half the number of chromosomes than that of a female.
D. Males produce sperms by meiosis.
E. Honeybees have a haplodiploid sex-determination system.
Choose the correct answer from the options given below :

Chronic auto immune disorder affecting neuro muscular junction leading to fatigue, weakening and paralysis of skeletal muscle is called as :

Select the correct statement.

Which one of the following statement is not true regarding gel electrophoresis technique?

Mechanism of a hypothetical reaction \(X_2 + Y_2 \rightarrow 2XY,\) is given below : \((i)\,\, X_2 \rightarrow X + X\, (fast)\) \((ii)\,\,X + Y_2 \rightleftharpoons XY + Y\, (slow)\) \((iii)\,\,X + Y \rightarrow XY\, (fast)\) The overall order of the reaction will be

Use of bioresources by multinational companies and organisations without authorisation from the concerned country and its people is called

The ratio of the distances travelled by a freely falling body in the \(1^{\text {st }}, 2^{\text {nd }}, 3^{\text {rd }}\) and \(4^{\text {th }}\) second :

Gene regulation governing lactose operon of E.coli that involves the lac \(I\) gene product is

The following solutions were prepared by dissolving \(10\, \mathrm{~g}\) of glucose \(\left(\mathrm{C}_{6} \mathrm{H}_{12} \mathrm{O}_{6}\right)\) in \(250 \,\mathrm{ml}\) of water \(\left(\mathrm{P}_{1}\right)\), \(10\, \mathrm{~g}\) of urea \(\left(\mathrm{CH}_{4} \mathrm{~N}_{2} \mathrm{O}\right)\) in \(250\, \mathrm{ml}\) of water \(\left(\mathrm{P}_{2}\right)\) and \(10\, \mathrm{~g}\) of sucrose \(\left(\mathrm{C}_{12} \mathrm{H}_{22} \mathrm{O}_{11}\right)\) in \(250\, \mathrm{ml}\) of water \(\left(\mathrm{P}_{3}\right)\). The right option for the decreasing order of osmotic pressure of these solutions is :

The density of \(2\; \mathrm{M}\) aqueous solution of \(\mathrm{NaOH}\) is \(1.28 \;\mathrm{g} / \mathrm{cm}^{3} .\) The molality of the solution is.....\(m\) [Given that molecular mass of \(\mathrm{NaOH}=40 \;\mathrm{g} \mathrm{mol}^{-1}\)]