1 a) There is no medium such as” Air” in space between the SUN and the
EARTH. How is it that you feel warm when you stand on the Middle
School field during your break time ?
1 b) What problem would arise if clinical thermometers did not have a kink
/ constriction ?
2 a) Why is it that Ruminants are able to digest cellulose while Human
beings are unable to do so ?
2 b) What action does Bile have on the food in the small intestine ? What
role do the villi play ?
3 Give 2 points of difference between an Acid and a Base.
4 Differentiate between Arteries and Veins.
5 What is drip irrigation ? Give one reason why Baburam a farmer from
Rajasthan prefers drip irrigation.
Answers
1 a it is because that of that we are tired
1B .The instrument will continue to function exactly as it did when the scale/kink was present. The only difference is that the operator will no longer be able to extract any useful information from the thermometer
2 a) Humans cannot digest cellulose due to lack of enzyme cellulase. However, in ruminants (such as cow), the cellulose is digested in rumen with the help of bacteria present in rumen.
2 b) The bile salts act to hold the triglycerides in their watery surroundings until the lipase can break them into the smaller components that are able to enter the villi for absorption.
3 Acids are sour in taste. Bases taste bitter. Acids release hydrogen ions (H+) when dissolved in water. Bases release hydroxyl ions (OH–) when dissolved in water.
4 Arteries carry blood away from the heart to the rest of the body. Veins push blood back to your heart
5 Drip irrigation is a method of crop irrigation that involves a controlled delivery of water to plants through system of pipes, valves, tubing and emitters.Drip irrigation is the most efficient water and nutrient delivery system for growing crops. ... Thanks to drip irrigation, farmers can produce higher yields while saving on water as well as fertilizers, energy and even crop protection products.