Q4. Answer the following questions in one or two sentences
(i) Why is if advised store lemon pickle in an aluminium utensil?
(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.
(vii) What is biodiversity?
(viii) What are genes? Where are they located?
(ix) What causes the red colour in tomato?
Answers
Answer:
Answer the following questions in one or two sentences
(i) Why is if advised store lemon pickle in an aluminium utensil?
(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.
(vii) What is biodiversity?
(viii) What are genes? Where are they located?
(ix) What causes the red colour in tomato?
Explanation:
Answer the following questions in one or two sentences
(i) Why is if advised store lemon pickle in an aluminium utensil?
(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.
(vii) What is biodiversity?
(viii) What are genes? Where are they located?
(ix) What causes the red colour in tomato?
Answer:
1. Lemon pickle cannot be stored in Al foil as the pickle is acidic in nature which reacts with Al metal liberating hydrogen gas and this can lead to spoiling of the pickle.
2. 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.
3. Petroleum, also called crude oil, is a fossil fuel. Like coal and natural gas, petroleum was formed from the remains of ancient marine organisms, such as plants, algae, and bacteria. Today, petroleum is found in vast underground reservoirs where ancient seas were located...
4. magnesium + oxygen → magnesium oxide.
5. The term biodiversity (from “biological diversity”) refers to the variety of life on Earth at all its levels, from genes to ecosystems, and can encompass the evolutionary...
6. The total complement of genes in an organism or cell is known as its genome, which may be stored on one or more chromosomes.
7. 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.