CBSE Questions for Class 6 Biology Components Of Food Quiz 4 - MCQExams.com

The body uses minerals to perform many different functions from giving strength to the bones to transmitting nerve impulses. Minerals are also used in the production of hormones and for maintaining a normal heartbeat. 

• Fats give our body energy, protect our organs, supports cell growth,  and help our body absorb vital nutrients. They are the most efficient form of energy food. Each gram of fat supplies the body with about 9 calories more than twice supplied by carbohydrates or proteins. Since fats & oils give us more energy than carbohydrates, we should consume them in less quantity. The chief sources of fats are butter, ghee, coconut oil, olive oil, mustard oil, etc.
• Carbohydrates are energy giving foods and their sources include cereals, sugar, potatoes, jaggery, etc
• Vitamins help our body to fight against diseases. Fruits and vegetables are rich sources of vitamins & minerals. 
• Roughage or fibres help to get rid of undigested food from the gut. We obtain them from vegetables and fruits.
• So, the correct answer is option B.

$$\textbf{Correct answer: C}$$ 

$$\textbf{Option (A):}$$ 

$$\bullet$$ Dust particles are present in the atmosphere which remain as suspended particles.

$$\bullet$$ Since these are not biological particles they can remain suspended in the air for a longer period.

$$\textbf{Option (B):}$$ 

$$\bullet$$ Moisture present in the air actually helps in the spreading the biological particles.

$$\bullet$$ Due to the high level of moisture in the air, the biological particles may stay viable longer.

$$\textbf{Option (C):}$$ 

$$\bullet$$ Biological particles that remain airborne survive only for a short period because they do not have the nutrients available to them. 

$$\bullet$$ Nutrients are available in different types of media but it is not found in the air. 

$$\textbf{Option (D):}$$ 

$$\bullet$$ Smog is the mixture of ozone with suspended and dust particles, volatile organic compounds, sulphur and nitrogen oxides. It reduces the visibility of the people.

Hence, the correct answer is option (C).

• Starch gives blue-black colour with Iodine and is used as a test. Starch is a polysaccharide(carbohydrate).

$$\textbf{Correct option: A}$$

$$\textbf{Solution:}$$

Option A:

$$\bullet$$ Carbohydrates are the energy-giving molecules which are abundantly found in cereals like wheat, rice, maize, barley, oats, etc.

$$\bullet$$ High amount of energy is produced when the carbohydrate molecules get broken down. Thus, carbohydrates found in cereals are responsible for providing energy.

$$\bullet$$ Proteins are the nitrogen containing compounds present in milk and pulses. They are the body-building food, thus, help in growth of the organism.

$$\bullet$$ Vitamins are needed in trace amounts and helps in metabolism and vitality. Vegetables are the good source of vitamins.

Hence the correct option is option A.

$$\textbf{Correct answer: D}$$ 

$$\textbf{Option (A):}$$ 

$$\bullet$$ Eggs are called one of the best sources of natural multivitamins because of the presence of vitamin A and vitamin B-complex.

$$\textbf{Option (B):}$$ 

$$\bullet$$ Lemon is a perfect source of vitamin C which performs regeneration functions of tissues.

$$\textbf{Option (C):}$$ 

$$\bullet$$ Fish oil is rich in lipid-soluble vitamins, vitamin A and vitamin D.

$$\textbf{Option (D):}$$ 

$$\bullet$$ All the given food components are sources of specific vitamins.

Hence, the correct answer is option (D).

$$\textbf{Correct answer: A}$$ 

$$\textbf{Option (A):}$$ 

$$\bullet$$ The oil obtained from plant and animal sources can be detected with the help of an oil-paper test. 

$$\bullet$$ Just by use of paper and moving it on the substance a few times the presence of oil on the paper can be detected. 

$$\bullet$$ This is the oil paper test that can directly show the presence of lipid in plant and animal sources.

$$\textbf{Option (B):}$$ 

$$\bullet$$ Starch is not used in a detection process. 

$$\textbf{Option (C):}$$ 

$$\bullet$$ Calcium sulphate is used to detect the presence of proteins in the sample.

$$\bullet$$ It produces a violet colour in the presence of peptide bonds in the sample. This proves the presence of proteins in specific samples.

$$\textbf{Option (D):}$$ 

$$\bullet$$ Iodine solution is used to detect the presence of starch in the sample. In the presence of iodine in blue colour appears showing a positive result for starch.

Hence, the correct answer is option (A).