A person observes that some plants have deep red, violet and brown coloured leaves. Can these leaves carry out photosynthesis ? Give reason for your answer.

Can a triangle have two obtuse angles ? Give reason for your answer.

Can plants survive in salt water? Give reason in support of your answer.

Can two numbers have 18 as their HCF and 380 as their LCM? Give reason to explain your answer.

Leaves of a healthy potted plant were coated with vaseline . Will this plant remain healthy for long ? Give reasons for your answer.

Boojho took some grains of boiled rice in test tube 'A' and Paheli took boiled and chewed rice in test tube 'B'. Both of them poured 1-2 drops of iodine solution into the test tube and observed the colour change. What colour change would they have observed? Give reasons for your answer.

A student placed a gas jar containing air in the upside down position over a gas jar full of red-brown bromine vapours. He observed that the red-brown colour spread upwards into the jar containing air. Based on this observation, the student concluded that it is only the bromine vapour which moves up and diffuses into air in the upper jar, the air from the upper jar does not move down by diffusion into the lower jar containing bromine vapours. Do you agree with this conclusion of the student ? Give reason for your answer.

How many triangles can be drawn having its angles as 45^(@), 64^(@) and 72^(@) ? Give reason for your answer.

How many triangles can be drawn having its angles as 53^(@), 64^(@) and 63^(@) ? Give reason for your answer.