Questions

Ans.  Suppose the speed of boat in still water is x km/h and speed of stream is y km/h

Speedof boat in downstream = (x + y) km/h x+ y = 32 …(i) 

Speed of boat in upstream = (x – y) km/h

x – y = 28 …(ii)

Add. Eqs. (i) and (ii), we get 2x = 60

x = 30 km/h

Electrical discharge machining (EDM), also known as spark machining, spark eroding, burning, die sinking, wire burning or wire erosion, is a manufacturing process whereby a desired shape is obtained by using electrical discharges.

Largest sea in the world is Philippine sea.

Legislative branch is made of two houses. 

1. Congress - the Senate and

2. House of Representatives.

Senate- composed of 100 senators two for each states - Vice President of USA is president of Senate.

House of Representatives - The House of Representatives is made up of 435 elected members, divided among the 50 states in proportion to their total population.

The macronutrient water is the most essential nutrient which plays a vital role in every function of the body. Macronutrients are those nutrients that are required in excess amounts for the development and functioning of the body.

Plants are producers, which means they make their own food. Chloroplasts are organelles found in eukaryotic and plant cells that conduct photosynthesis. Chloroplasts absorb sunlight and use it in conjunction with water and carbon dioxide gas to produce food for the plant.

Plants use energy from sunlight to help make their food, but they need chloroplasts to do it.

Hence, in plants, chloroplasts are necessary for Photosynthesis.