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Digestive System in Humans

Which provide...

Question

Which provides more energy to human body after digestion - $1 k g$ of rice or $1 k g$ of potatoes.

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Solution

$1 k g$ of rice provides $5.3 x 10^{6} J$ of energy.
$1 k g$ of potatoes provide $3.7 x 10^{6} J$ of energy.
Hence, $1 k g$ of rice provides more energy compared to $1 k g$ of potatoes.

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Energy content of different foods are as follows:

Food Energy content per kg

$W h e a t 3.2 j o u l e s R i c e 5.3 j o u l e s P o t a t o e s 3.7 j o u l e s M i l k 3.0 j o u l e s$

Which food provides the least energy and which provides the maximum?

Q. Digestion needs the help of two more systems in the body to provide energy from food. Which are these systems and how do they help?

Q. Potatoes and rice provide energy to our bodies. They are rich in .

Which contains more heat energy 1 kg of ice or 1 kg of water ?

Q. Solve the crossword using the following clues.

Down:
1. Provides energy, found in rice, potatoes, sugarcane etc.
2. Needed for their specififc roles in the body; eg., iron, calcium, sodium etc.

Across:
1. Provides building material for body growth, found in pulses, milk, egg etc.
2. Needed for normal functioning of various body processes.
3. Provides energy and insulation, found in butter, ghee and oil.

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