Q1. Give difference between Physical and Chemical changes.
2. What is lateral inversion of light, explain with an example of ambulance.
3. Draw and explain the soil profile
4.Name the different cells in human blood.Write 4 functions of blood.
5. What is the difference between inhalation and exhalation?
science class 7
question to practice
Answers
Answer:
With the number of COVID-19 cases leaning dangerously more than 200,000 and the worldwide death toll crossing more than 8,000, the World Health Organization (WHO) declared the virus outbreak a pandemic in the second week of March 2020, four months after the novel virus first made headlines.
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Answer:
1)Physical changes only change the appearance of a substance, not its chemical composition. Chemical changes cause a substance to change into an entirely substance with a new chemical formula. Chemical changes are also known as chemical reactions
2)In the mirror the right appears left and the left appears right. Note that only sides are interchanged; the image does not appear upside down. For example in the given figure ambulance is written opposite so as to be seen correctly in the mirror of the vehicle moving ahead.
3)A soil profile is a vertical section of soil like the diagram above. It allows you to examine the structure of soil. A soil profile is divided into layers called horizons. ... Most important for plant growth, the A and B horizons are the top two layers of the soil.
4)Blood is a specialized body fluid. It has four main components: plasma, red blood cells, white blood cells, and platelets. Blood has many different functions, including: transporting oxygen and nutrients to the lungs and tissues
5)Inhalation is a part of breathing where the air is taken into the lungs by creating negative pressure by the contraction of respiratory muscles and diaphragm. Exhalation is a part of breathing where the air is drawn out of the lungs by the relaxation of respiratory muscles.
Explanation:
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