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Alexander Fleming, a Scottish scientist discovered the first antibiotic & named it ‘Penicillin’.
Penicillin discovery was ‘a chance’ discovery. Fleming was experimenting with Staphylococcus bacteria. A petridish (cell culture dish) had been left open by mistake, was found to be contaminated by blue-green mold. This visible mold growth inhibited bacterial growth around itself.
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Yogita Ingle 5 years, 1 month ago
Malathion is a pesticide that is used to kill insects that harm crops.
Posted by Lena Saju 5 years, 1 month ago
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Yogita Ingle 5 years, 1 month ago
Large grasses cultivated for their nutritious seeds are called cereals.
Posted by Møøđįə Bøý 5 years, 1 month ago
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Weeds are unwanted plants. They grow with crops. They compete for nutrients and water with main crop. So weeds are very harmful. Process of controlling the weed is called weeding. Weeding is done manually by using khurpi and by using mechanical machines. Weeds are also controlled by using some chemical substances like 2, 4-D. These chemicals are called weedicide and used to kill and destroy the weed.
Posted by Sharini Padayachi 5 years, 1 month ago
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Saanvi Jamwal 5 years, 1 month ago
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The process of transformation from an immature form of an animal like larva to its adult form in two or more distinct stage is called metamorphosis.
The transformation of larvae into an adult through drastic changes in appearance is called metamorphosis. A tadpole and the adult frog look very different from each other.
Posted by Sharini Padayachi 5 years, 1 month ago
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Saanvi Jamwal 5 years, 1 month ago
Mayank Satsangi 5 years, 1 month ago
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When something is burnt, a hot luminous gas emerges out of the substance. This gas is called as flame. Flames are result of the substances which vaporizes on burning.
Posted by Harshika Saharan 5 years, 1 month ago
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Yogita Ingle 5 years, 1 month ago
Wheat is a rabi crop and is grown during the winter season (October to December).
Posted by Kandula Mohan . Sai Pranav 5 years, 1 month ago
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Meghna Thapar 5 years, 1 month ago
Microorganisms are divided into seven types: bacteria, archaea, protozoa, algae, fungi, viruses, and multicellular animal parasites ( helminths ). Each type has a characteristic cellular composition, morphology, mean of locomotion, and reproduction. The most common types are bacteria, viruses and fungi. There are also microbes called protozoa.
Posted by Muskan Rawandhe 5 years, 1 month ago
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Meghna Thapar 5 years, 1 month ago
The cathode in the electroplating circuit is the part that needs to be plated. It is also called the substrate. This part acts as the negatively charged electrode in the circuit. Solution: The electrodepositing reaction takes place in an electrolytic solution. The part to be coated acts as the cathode (negative electrode) of an electrolytic cell; the electrolyte is a solution of a salt of the metal to be coated; and the anode (positive electrode) is usually either a block of that metal, or of some inert conductive material.
Posted by Devendra Yadav 5 years, 1 month ago
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Mayank Satsangi 5 years, 1 month ago
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Wood has been a traditional fuel for both domestic and industrial use. However, it produces a lot of smoke that can cause respiratory problems. Also, wood is obtained from trees. Thus, using wood as a fuel causes deforestation. Therefore, slowly wood is replaced by LPG, which is a liquefied form of petroleum gas. It does not give out smoke and other pollutants and is a cleaner fuel. Again, fuel efficiency of LPG is more than that of wood. The calorific value of LPG is 55000 kj/kg, while that of wood is between 17000 to 22000 kj/kg. Hence, LPG is favoured over wood.
Posted by Soham Dixit 5 years, 1 month ago
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Yogita Ingle 5 years, 1 month ago
There are three zones in flame, viz. outer zone, middle zone and inner zone.
Outer Zone: This zone is blue in colour. It is the hottest part of the flame, because complete combustion takes place in this zone.
Middle Zone: This zone is yellow and orange in colour. This zone is moderately hot because partial combustion takes place in this zone.
Inner Zone: This zone is dark in colour. This is the coolest part of the flame because no combustion takes place in this zone.
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Gaurav Seth 5 years, 1 month ago
Chromosomes are thread-like structures present in the nucleus, which carries genetic information from one generation to another. They play a vital role in cell division, heredity, variation, mutation, repair and regeneration.
In Eukaryotic cells, genetic material is present in the nucleus in chromosomes, which is made up of highly organized DNA molecules with histone proteins supporting its structure.
Chromosome means ‘coloured body’, that refers to its staining ability by certain dyes.
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Gaurav Seth 5 years, 1 month ago
Drip system : In this method, irrigation is done drop by drop, near the plants so that only part of the soil near the roots are the wet. This type of irrigation is done for fruit plants, garden and trees. Moreover, drip irrigation there is no wastage of water, however, irrigation needs to be done more frequently.
Posted by Bhavana Ramesh 5 years, 1 month ago
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Yogita Ingle 5 years, 1 month ago
Broadcasting is a method of seeding in agricultural field that involves scattering of seed in all directions unifromly.
Posted by Mayank Chaudhary 5 years, 1 month ago
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Aaruhi Shukla 5 years, 1 month ago
Abdull Kareem 5 years, 1 month ago
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A vacuole is a membrane-bound sac that plays roles in introcellular digestion, and the release of cellular waste products. In animal cells vacuoles are usually pretty small, but plants have large vacuoles. The vacuoles store both water and waste.
Posted by Aditya Tyagi 5 years, 1 month ago
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Aaruhi Shukla 5 years, 1 month ago
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A gland which do not have duct or tube and secretes its product directly into blood steam is called endocrine gland. They make a chemical substance called hormones.
Example: Pitutary gland, Thyroid gland , adrenal gland etc.
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Samiksha S 5 years, 1 month ago
1Thank You