Question

{BIOLOGY}⬇️
1️⃣Write a short note on Organic Farming.
2️⃣ Make a list of Kharif and Rabi crops.

{CHEMISTRY}⬇️
2️⃣The burning of magnesium ribbon is also a type of combustion. Explain.
3️⃣Write the harmful products formed during incomplete combustion of fuel?
4️⃣In a candle flame, what is the colour of innermost zone and middle zone?

5️⃣The calorific value of petrol and CNG are 45000 kJ/ kg and 50000 kJ/ kg respectively. If you have vehicle which can run on petrol as well as CNG, which fuel will you prefer and why?

[CLASS: 08]
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No answer from G00gle!
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Explain the Answers correctly! ❏▬▬▬▬▬▬▬▬▬▬❏​

Answer 1

Answer:

1 Organic farming is a technique, which involves the cultivation of plants and rearing of animals in natural ways. This process involves the use of biological materials, avoiding synthetic substances to maintain soil fertility and ecological balance thereby minimizing pollution and wastage.

2 Rabi ::: barley,rapeseed.,mustard,Wheat,Bajra (Pennisetum glaucum) ,Linseed.

Kharif ::: Rice, maize, bajra, ragi, soybean, groundnut, cotton.

3 Incomplete combustion occurs when the supply of air or oxygen is poor. Water is still produced, but carbon monoxide and carbon are produced instead of carbon dioxide.

4 The flame of the candle has three zones, the outer zone is blue, the middle zone is yellow and the inner zone is black.( diagram attached )

5 The calorific value of compressed natural gas is higher than petrol. So, CNG will be a good preference. It also produces more heat energy than petrol. It has less environmental pollutants and also less costly than petrol.

Answer 2

Biology

• Organic agriculture can be defined as "an integrated farming system that strives for sustainability, the enhancement of soil fertility and biological diversity while, with rare exceptions, prohibiting synthetic pesticides, antibiotics, synthetic fertilizers, genetically modified organisms, and growth hormones.
• Examples of Rabi Crops

• Wheat
• Barley
• Oats
• Pulses
• Mustard
• Linseed
• Examples of Kharif Crops

Rice

Maize

Sorghum

Bajra

Soybean

Chemistry

• Oxygen and magnesium combine in a chemical reaction to form this compound. After it burns, it forms a white powder of the magnesium oxide. Magnesium gives up two electrons to oxygen atoms to form this powdery product. This is an exothermic reaction
• Incomplete combustion occurs when there isn't enough oxygen to allow the fuel to react completely with the oxygen to produce carbon dioxide and water, and also when the combustion is quenched by a heat sink such as a solid surface or flame trap.
• innermost Zone -black
• middle zone yellow

• The calorific value of compressed natural gas is higher than petrol. So, CNG will be a good preference. It also produces more heat energy than petrol. It has less environmental pollutants and also less costly than petrol.