| Draw the electron-dot structure for ethyne. A mixture of ethyne and oxygen is burnt for welding |
| The most suitable method of raising a banana plant |
| Name and explain the two modes of asexual reproduction observed in hydra |
| Draw a labelled diagram of the set-up of a circuit |
| The melting points and boiling points of some ionic compounds |
| To get an enlarged, real and inverted image of an object |
| Define the following terms in the context of a diverging mirror |
| Consider the following electric circuit |
| Explain in brief how stability of DNA content |
| Draw ray diagrams to show the nature, position and relative size |
| What are chromosomes |
| Plants have neither a nervous system nor muscles, even then they |
| Write a test to identify the gas evolved (if any) |
| Name two metals which react violently with cold water |
| With the help of an activity, explain the conditions |
| Why can metals high up in the reactivity series |
| Displacement reactions also play a key role in extracting metals |
| Excessive use of chemicals and pesticides in agriculture |
| Define electric power. When do we say that the power consumed in an electric circuit is 1 watt |
| A wire of resistance R is cut into three equal parts |
| Draw labelled diagrams to show different stages of budding in Hydra |
| An object is placed at a distance of 60 cm from a concave lens |
| State the role of phloem in the transport of materials in plants. |
| The transport system in plants is relatively slower |
| Besides minimising the loss of blood |
| A student performs the following experiment in his school laboratory |
| The percentage of solar energy which is not converted |
| Which of the following groups do not constitute a food chain |
| An old person is suffering from an eye defect |
| Mirror ‘X’ is used to concentrate sunlight in solar furnace and Mirror ‘Y |
| The breakdown of glucose has taken the following pathway |
| Name the life process of an organism that helps in the growth of its population |
| Name the human male reproductive organ that produces sperms and also secretes a hormone |
| Trace the movement of oxygenated blood in the body |
| Write the function of following parts in human female reproductive system |
| Mention any two components of blood |
| The acid produced in our stomach during digestion of food |
| If pea plants with round and green seeds (RRyy) |
| The correct/true statement(s) for a bisexual flower is/are |
| The plant hormone whose concentration stimulates the cells |
| Secretion of less saliva in mouth will effect the conversion of |
| The formation of magnesium oxide is correctly shown in option |
| The metals obtained from their molten chlorides |
| Reaction between two elements A and B, forms a compound C. |
| Dilute hydrochloric acid reacts with sodium hydroxide |
| The following table shows the pH values of four solutions |
| The products formed when Aluminium and Magnesium |
| Electrolysis of water is a decomposition reaction |
| The industrial process used for the manufacture of caustic soda |
| The colour of clear sky from the earth appears blue |