List of practice Questions

$S_{N}1$ reaction is favoured by

Root pressure was discovered by

Root region with thin-walled, small cells having dense cytoplasm is

Roots are modified to perform specific functions other than their normal functions. The given figure shows modification of the roots of mangrove plant. Select the incorrect option regarding it.

$RNA$ is the genetic material in

Roasting is generally done in case of the following

Roasting of copper pyrite ores is for the following purpose

Root hair arises from

Ribosomes are composed of

Right atrium receives blood from

Rising of dough is due to

Respiration in insects is called direct because

Restriction endonuclease which cuts the DNA strands to produce blunt ends is

Resultant of two equal vectors acting at right angle to each other is 14.14 unit. The magnitude of each force is

Reproductive tap roots develop in

Resistance to jassids in cotton plants and to cereal leaf beetle in wheat plants is due to

Relative permittivity and permeability of a material $\varepsilon_r$ and $\mu_r$ , respectively. Which of the following values of these quantities are allowed for a diamagnetic material?

Reorganisation of genetic material or genetic recombination occurs during

Reproductive and child health care programme looks after

Refer to the transverse section of ovary of mustard plant. Identify $X$ and $Y$ in it.

Refractory metals are used in construction of furnaces because

Regulation of gene expression occurs at the level of

Relative decrease in V.P. of an aqueous solution of NaCl is 0.167. Number of moles of NaCl presentin 180 g of $H_2O$ is

Refer to the given stages $A, B, C$ and $D$ of meiosis $I$ and select the incorrect statement regarding them.

Refer to the given statements' and select the correct ones (i) Fossils are remains of hard parts of life forms in rocks (ii) Dinosaurs disappeared about $65$ mya (iii) Animals called lobe fins evolved into reptiles (iv) Study of fossils is called palaentology