Life Processes Test

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Life Processes Test - 23

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Weekly Quiz Competition

Question 1
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Which of the following statements about the autotrophs is incorrect?

A
They synthesise carbohydrates from carbon dioxide and water in the presence of sunlight and chlorophyll

B
They store carbohydrates in the form of starch

C
They convert carbon dioxide and water into carbohydrates in the absence of sunlight

D
They constitute the first trophic level in food chains

Solution

They convert carbon dioxide and water into carbohydrates in the absence of sunlight.
Question 2
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In which of the following groups of organisms, food material is broken down outside the body and absorbed?

A
Mushroom, green plants, Amoeba

B
Yeast, mushroom, bread mould

C
Paramecium, Amoeba, Cuscuta

D
Cuscuta, lice, tapeworm

Solution

All of them are saprotrophs. In saprotrophic mode of nutrition, food material is broken down outside the body and absorbed.
Question 3
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Select the correct statement

A
Heterotrophs do not synthesise their own food

B
Heterotrophs utilise solar energy for photosynthesis

C
Heterotrophs synthesise their own food

D
Heterotrophs are capable of converting carbon dioxide and water into carbohydrates

Solution

Heterotrophs depend on other organisms for food.
Question 4
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Which is the correct sequence of parts in human alimentary canal?

A
Mouth → stomach → small intestine → oesophagus → large intestine

B
Mouth → oesophagus → stomach → large intestine → small intestine

C
Mouth → stomach → oesophagus → small intestine → large intestine

D
Mouth → oesophagus → stomach → small intestine → large intestine
Question 5
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If salivary amylase is lacking in the saliva, which of the following events in the mouth cavity will be affected?

A
Proteins breaking down into amino acids

B
Starch breaking down into sugars

C
Fats breaking down into fatty acids and glycerol

D
Absorption of vitamins

Solution

Salivary amylase converts starch into sugar. Digestion of proteins and fats does not take place in mouth.
Question 6
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The inner lining of stomach is protected by one of the following from hydrochloric acid. Choose the correct one

A
Pepsin

B
Mucus

C
Salivary amylase

D
Bile

Solution

Mucus protects the inner lining of stomach from hydrochloric acid.
Question 7
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Which part of alimentary canal receives bile from the liver?

A
Stomach

B
Small intestine

C
Large intestine

D
Oesophagus

Solution

Bile from gall bladder goes to small intestine through hepatopancreatic duct.
Question 8
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A few drops of iodine solution were added to rice water. The solution turned blue-black in colour. This indicates that rice water contains

A
Complex proteins

B
Simple proteins

C
Fats

D
Starch

Solution

Starch makes a dark blue complex with iodine. This is the most often used test to check the presence of starch in something.
Question 9
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In which part of the alimentary canal food is finally digested?

A
Stomach

B
Mouth cavity

C
Large intestine

D
Small intestine

Solution

Partial digestion of food takes place in mouth and stomach. Digestion does not happen in large intestine. It is the small intestine, where digestion is completed.
Question 10
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Choose the function of the pancreatic juice from the following

A
Trypsin digests proteins and lipase carbohydrates

B
Trypsin digests emulsified fats and lipase proteins

C
Trypsin and lipase digest fats

D
Trypsin digests proteins and lipase emulsified fats

Solution

Trypsin completes the digestion of protein. Lipase digests emulsified fat to convert it into fatty acids and glycerol.

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Life Processes Test - 23

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Life Processes Test - 23

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SHARING IS CARING

Question 1

They synthesise carbohydrates from carbon dioxide and water in the presence of sunlight and chlorophyll

They store carbohydrates in the form of starch

They convert carbon dioxide and water into carbohydrates in the absence of sunlight

They constitute the first trophic level in food chains

Solution

Question 2

Mushroom, green plants, Amoeba

Yeast, mushroom, bread mould

Paramecium, Amoeba, Cuscuta

Cuscuta, lice, tapeworm

Solution

Question 3

Heterotrophs do not synthesise their own food

Heterotrophs utilise solar energy for photosynthesis

Heterotrophs synthesise their own food

Heterotrophs are capable of converting carbon dioxide and water into carbohydrates

Solution

Question 4

Mouth → stomach → small intestine → oesophagus → large intestine

Mouth → oesophagus → stomach → large intestine → small intestine

Mouth → stomach → oesophagus → small intestine → large intestine

Mouth → oesophagus → stomach → small intestine → large intestine

Question 5

Proteins breaking down into amino acids

Starch breaking down into sugars

Fats breaking down into fatty acids and glycerol

Absorption of vitamins

Solution

Question 6

Pepsin

Mucus

Salivary amylase

Bile

Solution

Question 7

Stomach

Small intestine

Large intestine

Oesophagus

Solution

Question 8

Complex proteins

Simple proteins

Fats

Starch

Solution

Question 9

Stomach

Mouth cavity

Large intestine

Small intestine

Solution

Question 10

Trypsin digests proteins and lipase carbohydrates

Trypsin digests emulsified fats and lipase proteins

Trypsin and lipase digest fats

Trypsin digests proteins and lipase emulsified fats

Solution

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