Q. Name two main reactions that occur during the the process of photosynthesis.

Q. Which type of fission is found in Plasmodium?

Q. What are homologous and analogues organs? Write their examples.

Q. What is vegetative propagation? Write one advantage of vegetative propagation.

Q. What happens on connecting too many appliances at a time to a single socket?

Q. (a) Explain the following.

Q. (a) What do you mean by covalent bond?
(b) Write the electron dot structure of methane and ethene.
(c) Explain the following with example.
(i) Addition reaction.
(ii) Displacement reaction.

Q. (a) What is a displacement reaction?
(b) Identify A in the following reactions.
(i) $Zn+CuS{O}_4\to A+Cu$
(ii) $N{a}_{2}S{O}_4+BaC{l}_2\to A+2NaCl$.

Q. Out of sodium, chlorine and silicon which one is metalloid?

Q. Give the name of the gas that evolved when sodium hydroxide reacts with zinc metal. Write the equation also.

Q. (a) Define Isotopes.
(b) Write the names of two insert gases.
(c) An element has $2,8,2$ electronic configuration. Write its group number and valency.

Q. (a) State Ohm's law.

Q. (a) Write the dehydration reaction of ethanol and write the name of dehydrating agent.
(b) Choose correct series for the following.

Compund	Series
(i) Ethane	(a) unsaturated hydrocarbon
(ii) Benzene	(b) long chained saturated hydrocarbon
(iii) Hexane	(c) hydrocarbon having odd atom
(iv) Methyl alcohol	(d) saturated hydrocarbon

Q. What is the main factor of sharply dropping the amount of ozone in the atmosphere?

Q. What is an artificial kidney/ haemodialysis? Write the use of haemodialysis.

Q. Two lamps one rated $60W$, $220V$ and the other $40W$, $220V$ are connected in parallel to a $220V$ electric supply mains. What is the total current drawn from the electric mains if the voltage of the electric supply is $220V$?

Q. Draw a labelled diagram of the neuron and describe the structure of neuron in detail.

Q. What are aerobic and anaerobic respiration? Describe the breakdown of glucose molecule by various pathways.

Q. A charge of $300$C is drawn by a filament of an electric bulb for $5$ minutes. Find the amount of electric current flowing through the circuit.

Q. Which is used in the following?
(i) To make drinking water free from germs.
(ii) For making tasty crispy Pakoras in kitchen.
(iii) To remove permanent hardness of water.
(iv) For making toys and decorative materials.

Q.

Q. Which type of energy sources are fossil fuels? Write down any two names of fossil fuels.

Q. Define the principle focus of a concave mirror. Write two uses of a convex mirror.

Q. (a) Give one example of redox reaction.
(b) Draw the labelled diagram of electrolytic decomposition of water.

Q. Draw a labelled diagram of an electric generator.

Q. What is the value of $pH$ for a neutral solution?

Q. (i) Why does the sky appear dark to an astronaut in space?
(ii) Which part of an eye adjusts the size of its pupil?

Q. Write the name of acid secreted from sting of ant.

Q. What is budding? Explain the budding in Hydra by the help of diagram.

Q. Write the names of male and female sex hormones. Draw a labelled diagram of male endocrine glands.