List of practice Questions

Karyokinesis follows cytokinesis. : Karyokinesis is the division of cytoplasm into two daughter cells.

Keys are analytical in nature. Keys are based on couplet.

Isogametes are formed in majority of sexually reproducing organisms. Morphologically distinct type of gametes are called isogametes.

$K_4[Fe(CN)_6]$ is diamagnetic and $[Fe(H_2O)_6 ]Cl_3$ is paramagnetic. Hybridisation of central metal m $K_4[Fe(CN)_6] is \,sp^3d^2,$ while in $[Fe(H_2O)_6]Cl_3\, is\, d^2\, sp^3$

Isocyanide test can be used to distinguish between secondary and tertiary amines. Tertiary amines on heating with chloroform and ale. $KOH$ form foul smelling substances.

Ions are absorbed from the soil by active transport only. The proteins present in the membranes of root hair cells passively pump ions from the soil into the cytoplasm of the epidermal cells.

: Interference is not observed if the two coherent slit sources are broad. : A broad source is equivalent to many narrow slit sources.

Inspiration occurs when there is a negative pressure in the lungs with respect to the atmospheric pressure. During inspiration, a decrease in pulmonary volume increases the intra-pulmonary pressure than atmospheric pressure which forces the air from outside to move into the lungs.

In the series $Sc$ to $Zn$, the enthalpy of atomisation of zinc is the lowest. Zinc has greater number of unpaired electrons.

In vapour state sulphur is paramagnetic in nature. In vapour state sulphur exists as $S_2$ molecule.

Increasing the current sensitivity of a galvanometer necessarily increases the voltage sensitivity. Voltage sensitivity is inversely proportional to current sensitivity.

In the metallury of aluminium, purified $Al_2O_3$ is mixed with $Na_3AlF_6$ or $CaF_2$. $Na_3AlF_6$ or $CaF_2$ lowers the melting point of mixture and increases its conductivity.

In the phenomenon of mutual induction, self induction of each of the coil persists Self induction arises when strength of current in one coil changes. In mutual induction, current is changing in both the individual coils

In the presence of alkaline $KMnO_{4} 4-$ methylacetophenone is oxidised to benzoic acid. Keto group is oxidised to $??OOH$ group.

In the reaction, $2Cu_{2}O_{\left(s\right)}+Cu_{2}S_{\left(s\right)} \rightarrow 6 Cu_{\left(s\right)}+SO_{2\left(g\right)}$ copper acts as a reductant and sulphur acts as an oxidant. The given reaction is not a redox reaction.

In some flowers like lily, perianth is a term used when calyx and corolla are not distinct. Calyx and corolla are the reproductive organs.

In some leguminous plants, the leaf base is swollen. The swollen leaf base is called pulvinus.

In molluscs, feather-like gills are present in mantle cavity. These gills have respiratory and excretory functions.

In $NH_3, N$ is $sp^3$ hybridised but bond angle is $107^{\circ}$. Shape of $NH_{3}$ molecule is trigonal pyramidal.

In pigeons, females are heterogametic and males are homogametic. In pigeons, females have $ZW$ sex chromosomes and males have $ZZ$ sex chromosomes.

In Rutherford?? $\alpha$ -particle scattering experiment, most of the $\alpha$ -particles were deflected by nearly $180^{\circ}$. The positive charge of the atom is spread throughout the atom that repelled and deflected the positively charged $\alpha$-particles.

In imbricate aestivation, out of five petals, one is completely internal, one is completely external and in each of the remaining three petals, one margin is internal and the other is external. Ascending imbricate aestivation is found in Cassia and gulmohur.

: In interference and diffraction, light energy is redistributed. : There is no gain or loss of energy, which is consistent with the principle of conservation of energy.

In malaria, a person experiences chills and high fever recurring every three to four days. This is caused by the release of haemozoin with rupture of liver cells.

In hydrogen and hydrogen like species, orbital energy depends only on the quantum number $n$ whereas in multi-electron atoms it depends on quantum numbers $n$ and $I$. The principal quantum number determines the size and the energy of the orbital.