English Medium इयत्ता १० - CBSE Question Bank Solutions for Science

The I.U.P.A.C name of CH₃CH₂CH = CH₂ is?

Which of the following compounds of carbon does not consist of ions?

Assertion: Impulse travels from dendrite to cell body and then along the axon to its end.

Reason: Information acquired at the end of the dendrite tip of a nerve cell sets of an electric impulse.

Which of the following statements are correct for carbon compounds?

1. Most carbon compounds are good conductors of electricity.
2. Most carbon compounds are poor conductors of electricity.
3. Force of attraction between molecules of carbon compounds is not very strong.
4. Force of attraction between molecules of carbon compounds is very strong.

Junction between two neurons is called ____________.

Which of the following is the formula of Butanoic acid?

Which of the following statement is not correct about the magnetic field?

In a given food chain if the amount of energy at the fourth trophic level is 6 kJ, what will be the energy available at the producer level?

We should reduce the use of the plastic bags, bottles etc. because ______.

Green plants utilize ______ percent of sun’s energy to prepare their food by the process of photosynthesis.

The process of accumulation of harmful chemical substances like pesticides, in the body of living organisms at each trophic level of a food chain is known as ______.

If 100 J energy is available at the producer level in a food chain then the energy available to the secondary consumer will be ______.

In an ecosystem, herbivores represent ______.

A food chain comprising birds, green plants, fish and man. The concentration of harmful chemical entering the food chain will be maximum in ______.

Which of the following is a logical sequence of food chain?

Which of the following is an autotroph?

Magnetic lines of force inside current carrying solenoid are ____________.

Food chains are very important for the survival of most species.

If 10,000 J solar energy falls on green plants in a terrestrial ecosystem, what percentage of solar energy will be converted into food energy?

Food chains are very important for the survival of most species.

Matter and energy are two fundamental inputs of an ecosystem. Movement of:

Observe the food web and answer the questions given below:

Why do all food chains start with plants?