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what are the harmful effects of weed in a crop field?
What are weedicides?
Difference between manures and fertilizers.
Give an account of fertilizers?
Why the drip system of irrigation of water is an economical method?
List any two factors in which time and frequency depend?
what is meant by crop rotation?
Name the modern methods of irrigation.
what are the two methods of sowing seeds?
why do farmers celebrate Baisakhi?
what is harvesting?
How does leguminous plants help in maintaining soil fertility?
what is meant by irrigation?
what is meant by manuring?
Can water be Non-renewable resources because people say if we use too much water it will be over.
What is high tide and low tide?
Is the force of gravitation exerted by objects of different masses same?
WHAT IS A "TEST TUBE BABY" ?
a student takes about 2 ml ethanoic acid in a dry test tube and adds a pinch of sodium hydrogen carbonate to it.he reports the following observations:a)immediately a colorless and odourless gas evolves with a brisk effervescence.b)gas turns lime water milky when passed through it.c)gas burns with an explosion .d)gas extinguishes the burning splinter that is brought near it. which are the three correct observations?
we need 20% aqueous solution of sodium hydroxide for the study of saponification reaction.when we open the lid of the bottle containing solid sodium hydroxide we observe it in which form? a)colorless transparent beads b)small white beads c)white pellets/flakes d)fine white powder