Question
After we work hard or perform physical activity, we feel hungry. Explain why?
✓
Answer
When we work hard or perform a physical activity (like running, swimming, cycling), we need more energy. To fulfill the energy requirement, we breathe faster. Fast breathing helps in the supply of more oxygen to our cells. Due to this, rate of breakdown of food increases and more energy is released. The rapid breakdown of food makes us feel more hungry.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
Open drain is a big concern now-a-days. Justify.
Why do we see the shadow of a bird flying close to the ground but not high up in the sky?
Complete the life cycle of silk moth.
Why is neutralisation useful in everyday life?
What is a neutralisation reaction? Give an example.
If Earth's axis was not tilted, what would be the effect on climate and seasons?
Briefly explain the maximum and minimum thermometers.
How would you identify whether a change is physical or chemical during an experiment?
Study the diagram carefully. It shows how the tilt of the Earth's axis affects the distribution of sunlight on the Earth's surface during different months - June (i) and December (ii).
(a) Why does the Northern Hemisphere receive more intense sunlight in June and less intense sunlight in December? Explain using the concept of the Earth's tilt and the distribution of sunrays.
How does the variation in sunlight intensity between the two hemispheres affect the occurrence of seasons on Earth? Support your answer with reference to the image.
(a) Why does the Northern Hemisphere receive more intense sunlight in June and less intense sunlight in December? Explain using the concept of the Earth's tilt and the distribution of sunrays.
How does the variation in sunlight intensity between the two hemispheres affect the occurrence of seasons on Earth? Support your answer with reference to the image.
Which of the following are not correct?
(a) The basic unit of time is second.
(b) Every object moves with a constant speed.
(c) Distances between two cities are measured in kilometres.
(d) The time period of a given pendulum is not constant.
(e) The speed of a train is expressed in $m / h$.
→(a) The basic unit of time is second.
(b) Every object moves with a constant speed.
(c) Distances between two cities are measured in kilometres.
(d) The time period of a given pendulum is not constant.
(e) The speed of a train is expressed in $m / h$.