Long answer type questions -
1- Describe how exchange of gases takes place inside the human respiratory system?
2- Discuss different kinds of soil?
3- With the help of diagram, explain the working of a thermos flask?
Answers
Answer:
1) Gas exchange takes place in the millions of alveoli in the lungs and the capillaries that envelop them. As shown below, inhaled oxygen moves from the alveoli to the blood in the capillaries, and carbon dioxide moves from the blood in the capillaries to the air in the alveoli.
2)Peat Soil
Peat soil is high in organic matter and retains a large amount of moisture.
This type of soil is very rarely found in a garden and often imported into a garden to provide an optimum soil base for planting.Silt Soil
Silt Soil is a light and moisture retentive soil type with a high fertility rating.
As silt soils compromise of medium sized particles they are well drained and hold moisture well.
As the particles are fine, they can be easily compacted and are prone to washing away with rain.
By adding organic matter, the silt particles can be bound into more stable clumps.Clay Soil
Clay Soil is a heavy soil type that benefits from high nutrients. Clay soils remain wet and cold in winter and dry out in summer.
These soils are made of over 25 percent clay, and because of the spaces found between clay particles, clay soils hold a high amount of water.
Because these soils drain slowly and take longer to warm up in summer, combined with drying out and cracking in summer, they can often test gardenersSandy soil
Sandy Soil is light, warm, dry and tend to be acidic and low in nutrients. Sandy soils are often known as light soils due to their high proportion of sand and little clay (clay weighs more than sand).
These soils have quick water drainage and are easy to work with. They are quicker to warm up in spring than clay soils but tend to dry out in summer and suffer from low nutrients that are washed away by rain.
The addition of organic matter can help give plants an additional boost of nutrients by improving the nutrient and water holding capacity of the soil.
3) A thermos is a bottle with a double-walled container inside of it. The air between the two walls is sucked out during construction, creating a vacuum. ... Heat that might otherwise transfer to the cold contents of the thermos is prevented from reaching it because of the vacuum between the thermos walls