Q4. Answer the following questions in one or two sentences -
(i) Why is if advised store lemon pickle in an aluminium utensil?
(ii) Compare LPG and wood as fuel.
(iii) What are the properties of polyester fabric?
(iv) What is petrolium? Where does it occur?
(v)Write a word equation for the reaction of magnesium with oxygen.
(vi) Why is LPG a better domestic fuel.than wood?
(vii) What is biodiversity?
(viii) What are genes? Where are they located?
(ix) What causes the red colour in tomato?
please answer immediately I will mark as brainliest if I am satisfied......
Answers
Explanation:
1)No, we cannot store the lemon pickle in aluminium utensil because aluminium is a metal and lemon is acidic. The acids react with metals to give hydrogen which would spoil the food and makes it unfit to use.
2)Wood
It is considered as a traditional fuel used for both domestic and industrial purposes.
Wood produces a lot of smoke which pollutes the atmosphere and cause respiratory diseases.
The usage of wood to a large extent causes deforestation.
The calorific value of wood ranges between 17000 to 22000 kJ/kg
However, wood may be used as a furnace, stove or fireplace in indoors while it is used for a campfire, furnace at outdoors.
LPG
The usage LPG (Liquefied petroleum gas) has replaced wood.
It doesn’t release smoke and other pollutants
It is a cleaner fuel
The fuel efficiency of LPG is more than that of wood.
The calorific value of LPG is 55000 kJ/kg
Hence LPG is mostly preferred choice.
6)LPG being a cleaner fuel than wood doesn’t release smoke and other pollutants.
Wood, on the other hand, releases a lot of smoke and fumes polluting the atmosphere causing pollution and leading to respiratory diseases.
Hence LPG is a better domestic fuel than wood.
3)Polyester is very durable and is resistant to many chemicals.
This is a popular fabric in the fashion industry, as it is resistant to shrining and stretching. ...
The fibres used to create Polyester are very strong yet lightweight.
The fibres are easily dyed.
4)Petroleum is a crude oil.It occurs under the seas and oceans after millions of years by the decomposition of dead remains of plants and animals.
5)The word equations are: iron + oxygen → iron oxide. magnesium + oxygen → magnesium oxide.
7)Biodiversity is the variety and variability of life on Earth. Biodiversity is typically a measure of variation at the genetic, species, and ecosystem level. Terrestrial biodiversity is usually greater near the equator, which is the result of the warm climate and high primary productivity.
8)Chromosomes are structures within cells that contain a person's genes. Genes are contained in chromosomes, which are in the cell nucleus. A chromosome contains hundreds to thousands of genes.
9)As the tomato ripens, its colour starts to change from green to yellow and then eventually to red. This is due to the breakdown of chlorophyll, which in turn synthesises a red carotenoid (another pigment group), lycopene. When ripe, the carotenoid can easily be seen as the dominant colour of the tomato, ie red.