List of practice Questions

A typical microsporangium of angiosperms is generally surrounded by four wall layers - epidermis, endothecium, middle layers and tapetum. The outer three wall layers perform the function of protection and help in dehiscence of anther to release the pollen.

: Stress is restoring force per unit area. : Interatomic forces in solids are responsible for the property of elasticity

Surface tension has same units as force gradient Surface tension is the force gradient along the suiface of liquide

The viscosity of liquid decreuses with rise of temperature. Viscosity of a liquid is the property of the liquid by virtue of which it opposes the relative motion amongst its different layers.

A single outcross often helps to overcome inbreeding depression. Out-crossing is best breeding method for increasing milk productivity.

A simple tissue is made of only one type of cells. Various simple tissues in plants are parenchyma, collenchyma and sclerenchyma.

A light body and a heavy body have same momentum. Then they also have same kinetic energy. Kinetic energy does not depend on mass of the body.

A piece of $DNA$ inserted into an alien organism generally does not replicate if not inserted into a chromosome. Chromosomes have specific sequences called 'ori' region where $DNA$ replication is initiated.

A plant cell shrinks in hypertonic solution. In hypertonic solution, water moves out of the cells due to plasmolysis.

Morphology based approach to taxonomy is known as ??lpha taxonomy? Multi-disciplinary approach to taxonomy called ??mega taxonomy??s favoured in recent years, has it excludes morphological features.

At critical temperature, surface tension of a liquid becomes zero. At this tempefature intermolecular forces for liquid and gases become equal. Liquid can expand without any restriction.

: Ductile metals are,used to prepare thin wires. : In, the stress-strain curve of ductile melals, the lenght between the points representing elastic limit and breaking point is very small

Hydrostatic .pressure is a vector quantity. Pressure is force divided by area, and force is a vector quantity.

$2$, $4$-$D$ is extensively used in agricultural and horticultural practices. $2$, $4$-$D$ is a herbicide.

$3d_{z^{2}}$ orbital is spherically symmetrical. The shapes of all five $d$-orbitals are similar to each other.

Asiatic lion is found in

Aspartame, the artificial sweetener is made by a dipeptide of the amino acids,

Aseptate and coenocytic mycelium is found in

Asexual method of reproduction by binary fission is common to which of the following? (i) Some eukaryotes (ii) All eukaryotes (iii) Some prokaryotes (iv) All prokaryotes

Asexual mode of reproduction in $Spirogyra$ is by

Asexual reproduction is common

As the temperature is increased, the time period of a pendulum

Ascent of sap is best explained by

Ascorbic acid is a

Ascorbic acid is the chemical name of