List of top Science Questions

Give two methods used to grow rose and jasmine plants by vegetative propagation.
Define a precipitation reaction. Give its example and also express the reaction that occurs in the form of a balanced chemical equation.
A tall pea plant with round seeds (TTRR) is crossed with a short pea plant with wrinkled seeds (ttrr). The \( F_1 \) generation will be:
Consider the following food chain:
Grass \( \rightarrow \) Grasshopper \( \rightarrow \) Frog \( \rightarrow \) Snake \( \rightarrow \) Eagle
If the amount of energy available at third trophic level is 50 kJ, the available energy at the producer level was:
Assertion (A) : In large animals, oxygen can reach different parts of the animal's body easily.
Reason (R) : Respiratory pigments take up oxygen from the air and carry it to body tissues.
In human alimentary canal, the digestive juice secreted by the gastric glands are:
Which one of the following is not an excretory product in plants?
The basic filtration unit of the excretory system in human beings is:
Juice of tamarind turns blue litmus to red. It is because of the presence of a chemical compound called:
In which one of the following situations a chemical reaction does not occur?
In order to prepare dry hydrogen chloride gas in a humid atmosphere, the gas produced is passed through a guard tube (drying tube) which contains:
Assertion (A): Concentrated nitric acid is diluted by adding water slowly to acid with constant stirring.
Reason (R): Concentrated nitric acid is easily soluble in water.
In the light of the above statements, choose the most appropriate answer from the options given below:

Select from the following a statement which is not true about the burning of magnesium ribbon in air:

The colour of the solution observed after about 1 hour of placing iron nails in copper sulphate solution is: 

You have three aqueous solutions A, B, and C as given below: 
A - Potassium nitrate 
B - Ammonium chloride 
C - Sodium carbonate 
The ascending order of the pH of these solutions is:

Assertion (A): Xylem tissue moves water and minerals obtained from the soil by the roots. 
Reason (R): Xylem tissue is found only in the roots of a plant. 

Juice of tamarind turns blue litmus to red. It is because of the presence of a chemical compound called: 

The incorrect statement about ozone is: 

Select the option having correct matching of the organism given in Column I with the mode of reproduction in Column II: Column I {0.2cm}

Identify from the following the ray diagram which shows the correct path of the reflected ray for the ray incident on a concave mirror as shown:

A tall pea plant with round seeds (TTRR) is crossed with a short pea plant with wrinkled seeds (ttrr). The F1 generation will be:

Assertion (A): Food web is a network of several food chains operating in an ecosystem. 
Reason (R): Food web decreases the stability of an ecosystem.

Consider the following food chain: Grass → Grasshopper → Frog → Snake → Eagle If the amount of energy available at third trophic level is 50 kJ, the available energy at the producer level was: 

In human alimentary canal, the digestive juice secreted by the gastric glands are: 

A hydrocarbon which does not belong to the same homologous series of carbon compounds is