Life Processes Test

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Life Processes Test - 84

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Weekly Quiz Competition

Question 1
1 / -0

The splitting of $$H_2 $$O to form $$O_2$$ and carbon compounds occur during:

A
Photosynthesis

B
Respiration

C
Digestion

D
Both A and B

Solution

During the photosynthesis process, water is split into oxygen molecules and carbon is reduced into carbohydrates molecules. On the other hand, respiration is an energy-releasing enzymatic controlled catabolic process that includes an oxidative breakdown of food material inside a living cell.
Hence, option 'A' is correct.
Question 2
1 / -0

Which of the following has highest pH?

A
Human saliva

B
Human blood

C
Gastric juice

D
Urine
Solution
- The normal pH range for saliva is 6.2 to 7.6.
- The pH levels of the blood are normally within the range of 7.35 to 7.45.
- Human gastric juice is acidic, with a pH of around 1.8
- The pH values of urine are usually between 6.0 and 7.5, making it slightly acidic.
Hence, from out of the given options the human blood has the highest pH.
Question 3
1 / -0

The acid present in the stomach:

A
Kills the harmful bacteria that may enter along with the food.

B
Protects the stomach lining from harmful substances.

C
Digests starch into simpler sugars.

D
Makes the medium alkaline.

Solution

'Hydrochloric acid' is an acid that is secreted in the stomach. It helps to kill the harmful bacteria that may enter the food.
So, the correct answer is option A.
Question 4
1 / -0

Choose the correct pair of sentences that are true to photosynthesis
(i) Sunlight, carbon dioxide, chlorophyll and water are necessary.
(ii) Oxygen is absorbed.
(iii) Leaves carry out photosynthesis.
(iv) Proteins are made during photosynthesis.

A
(iii) and (iv)

B
(i) and (iii)

C
(ii) and (iv)

D
(i) and (iv)

Solution

Photosynthesis is the process done by leaves, for which sunlight, carbon dioxide, chlorophyll and water are necessary. The primary product is glucose and oxygen is released as a byproduct.
So, the correct answer is option (b) (i) and (iii).
Question 5
1 / -0

Organisms which prepare food for themselves using simple naturally available raw materials are referred to as

A
Heterotrophs

B
Autotrophs

C
Parasites

D
Saprophytes

Solution

An organism that prepares food for itself using Carbon dioxide, water in the existence of 'sunlight' and 'chlorophyll' is referred to as 'autotrophs'.
Heterotrophs depend on other autotrophs for nutrition.
Parasites live inside other organisms and depend on that organism for nutrition.
Saprophytes feed on dead decaying organisms.
Thus, the correct answer is option (b).
Question 6
1 / -0

Which of the following statements is/are correct?
i) All green plants can prepare their own food.
ii) Most animals are autotrophs.
iii) Carbon dioxide is not required for photosynthesis.
iv) Oxygen is liberated during photosynthesis.
Choose the correct answer from the options below

A
(i) and (iv)

B
(ii) only

C
(ii) and (iii)

D
(i) and (ii)
Solution
- All the green plants are - producers" so they can set up their own food.
- Animals don't make their own food. They are heterotrophs.
- Carbon dioxide and water required for the process of photosynthesis in plants.
- Oxygen liberates in the process of photosynthesis.
  Statement (I) and (iv) are the correct statements.
The correct answer is (a).
Question 7
1 / -0

The enzymes present in the saliva convert

A
Fats into fatty acids and glycerol.

B
Starch into simple sugars.

C
Proteins into amino acids.

D
Complex sugars into simple sugars.

Solution

The saliva contains amylase enzyme that breaks down starch into simple sugar.
The correct answer is option (b).
Question 8
1 / -0

Select the correct statement(s).

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

A. Heterotrophs do not synthesise their own food.
Solution : Heterotrophs are the organisms that cannot synthesize their own food and derive it from other sources directly or indirectly and autotrophs are the organisms like plants that synthesize their own food by help of co2 and water.
So the correct answer is " Heterotrophs do not synthesise their own food.".
Question 9
1 / -0

Which of the following causes red colour of the blood?

A
Filerin

B
Antigen

C
Haemoglobin

D
Platelets

Solution

Haemoglobin, an heme or iron containing protein present in the RBC imparts red color to the blood.
So, the correct answer is 'Haemoglobin'
Question 10
1 / -0

What is a higher side blood pressure of the normal body-

A
120 mm

B
90 mm

C
140 mm

D
80 mm

Solution

The blood pressure in healthy human is 120/80 mm Hg.
Therefore, the highest side of blood pressure is 120mm.

Option 'C' is correct.

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Re-Attempt Weekly Quiz Competition

Life Processes Test - 84

Result

Life Processes Test - 84

Score

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Rank

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SHARING IS CARING

Question 1

Photosynthesis

Respiration

Digestion

Both A and B

Solution

Question 2

Human saliva

Human blood

Gastric juice

Urine

Solution

Question 3

Kills the harmful bacteria that may enter along with the food.

Protects the stomach lining from harmful substances.

Digests starch into simpler sugars.

Makes the medium alkaline.

Solution

Question 4

(iii) and (iv)

(i) and (iii)

(ii) and (iv)

(i) and (iv)

Solution

Question 5

Heterotrophs

Autotrophs

Parasites

Saprophytes

Solution

Question 6

(i) and (iv)

(ii) only

(ii) and (iii)

(i) and (ii)

Solution

Question 7

Fats into fatty acids and glycerol.

Starch into simple sugars.

Proteins into amino acids.

Complex sugars into simple sugars.

Solution

Question 8

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 9

Filerin

Antigen

Haemoglobin

Platelets

Solution

Question 10

120 mm

90 mm

140 mm

80 mm

Solution

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