b) How does amoeba engulfs its food?
Q16. A) How does the air move in a sea breeze?
B) Why are cloudy nights warmer than clear nights?
C) Two thin blankets are usually warmer than one thick blanket?
Explain.
Q17. Raghu ate an egg sandwich in the morning that was composed of
bread, lettuce, mayonnaise and egg whites. Based on your knowledge
on the of process of digestion, answer the following questions:
a. Trace the journey of sandwich in the alimentary canal.
b. Which food substance will be digested first and where will its
digestion begin?
c. Which food substance will be digested last and where will be it
digested?
d. Name the enzymes and acids involved in the process of digestion of
egg sandwich.
Q18. 1) Write name of each developmental stage in life cycle of silk
Moth
(b)
(d)
II) Explain how silk thread is obtained from cocoons of silk moth?
III) Give reason of the following :-
Answers
when amoeba senses the food, it pushes out pseudopodia around the food particle and engulfs it. the food becomes trapped in food vacuole.
During the day, the land gets heated faster then water. the air over the land becomes hotter and rises up and cooler air rushes for the sea to take its place. the warm air from the land moves towards the sea to complete the cycle. this is how the air move in the sea breeze.
the clouds the made up of water vapour and act as a large blanket over the earth's surface which keeps the heat trapped inside the earth and let very little heat to come out that's why temperature is warmer than clear nights.
first the sandwich will go to your mouth and will breck down into glucose and it will pass to oesophagus and will reach to the stomach and will realese gastric juice. then it will receive pancreatic juice from pancreas, bile juice from liver and will reach to the instine and and also will receive intestinal juice from small intestine. it will all be digested and then rech to the large intestine and will absorb dalta and at the end it will reach to anus and removed as wate.
I think egg will digest first and digestion first starts at the mouth
I think lettuce will be digested last it will be last digested in large intestine.
the stomach releases gastric juices containg hydrochloride acid and the enzymes, pepsin, which initiative the breakdown of the protein.
a)eggs on mulberry leaves.
b) silkworm
c)cocoon
d)cocoon with developing moth
the shopkeeper gives eggs to the farmers and they keep them in a hygienic condition under. the eggs are warmed to a suitable temperature for larvae to hatch. when the caterpillar came out the eat day and night the mulberry leaves and grow in size. after 25 to 30 days they stop eating and spin out cocoon. the farmers keep this cocoon under sun or boil them and take out thread.
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