Assertion (A): Concentrated nitric acid is diluted by adding water slowly to acid with constant stirring.Reason (R): Concentrated nitric acid […]
Assertion (A): In large animals, oxygen can reach different parts of the animal’s body easily.Reason (R): Respiratory pigments take up
Which one of the following gets biomagnified at different levels in a food chain ?(a) Carbon monoxide(b) CFC’s(c) DDT(d) Manure
In the food chains given below. Select the most efficient food chain in terms of energy (a) Grass – Grasshopper
The minimum number of identical bulbs of rating 4V; 6W, that can work safely with desired brightness, when connected in
An electric bulb is rated 220 V; 11W. The resistance of its filament when it glows with a power supply
A piece of wire of resistance ‘R’ is cut lengthwise into three identical parts. These parts are then connected in
An optical device ‘X’ is placed obliquely in the path of a narrow parallel beam of light. If the emergent
To get an image of magnification -1 on a screen using a lens of focal length 20 cm, the object
When a pure-tall pea plant is crossed with a pure-dwarf pea plant, the percentage of tall pea plants in F1
In a bisexual flower the male gametes are present in the : (a) anther(b) ovary(c) stigma(d) filament Correct Answer :
Plants like rose and banana have lost the capacity to produce: (a) flowers(b) buds(c) seeds(d) fruits Correct Answer : Option