Question

1. Name any 2 oxidizing agents for alcohols. 2.Distinguish b/w food chain nd food web. 3. Why ethane decolourises bromine water but ethane not..?? 4. Describe 3 methods ofplant propagation which are commonly used for growing garden plants....??

Answer 1

1.potassium dichromate (K2Cr2O7) and alkaline potassium permanganate (KMnO4). 2. A food chain only follows just one path as animals find food. eg: A hawk eats a snake, which has eaten a frog, which has eaten a grasshopper, which has eaten grass. A food web shows the many different paths plants and animals are connected. eg: A hawk might also eat a mouse, a squirrel, a frog or some other animal. 3.Ethene is an unsaturated compound.it has one double bond.When Bromine water(brown in colour) is added to ethene it reacts with ethene to form a new compound 1,2 dibromoethane which is colourless.The colour of bromine water is gone now. Generally bromine water is decolourise by all the compounds that contain double or triple bond. Ethane is a saturated compound with no multiple bond hence does not decolourise Br water. 4.Plants can be propagated through sexual as well as asexual methods. Sexual methods involve sowing of seeds which is time consuming. Garden plants can be propagated through asexual methods rapidly. These methods of propagation are called vegetative propagation and produce identical plants . The commonly used propagating methods for garden plants are cutting , grafting, layering , etc. Cutting is the method of propagation in which part from parent plant is cut and grown into a new plant. The various cutting include stem cutting, leaf cutting, etc. This method is often used in home gardening. For example leaf cuttings of Begonia are used to produce entire new plants Grafting is the common method of vegetative propagation. In this method two parts of plants-stock and scion are joined in such a way that they grow as one. It is performed between two closely relate dicotyledonous plants having vascular cambia. Layering is a type of artificial vegetative propagation. In this method, roots are artificially induced on the stem branches before they are detached from the parent plant for propagation. For example –– mound layering is performed in jasmine