Life Processes Test

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Life Processes Test - 27

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Question 1
1 / -0

What are the end products of fermentation of sugar?

A
Water + CO₂

B
Alcohol + CO₂

C
CO₂

D
Alcohol

Solution

The end products of fermentation are alcohol, carbon dioxide, and lactic acid. The process is essential in the production of beer, fermented milk, and bread. To arrive at these end products, sugars are broken down in a process called glycolysis.
Hence, the correct option is (B).
Question 2
1 / -0

The process of respiration is concerned with

A
intake of O₂

B
liberation of O₂

C
intake of CO₂

D
liberation of energy

Solution

Respiration: The process of releasing energy by the oxidation of food is known as respiration. The process of respiration involves intake of oxygenated air into the cells for breaking the food and releasing energy.
Hence, the correct option is (D).
Question 3
1 / -0

Respiration differs from burning because

A
burning consumes O₂, but respiration consumes CO₂

B
burning liberates CO₂, but respiration liberates O₂

C
burning is a physicochemical process, but respiration is a biochemical process

D
burning is an endothermic reaction, but respiration is an exothermic reaction

Solution

The main difference between respiration and burning is that respiration is the breakdown of glucose to release energy, whereas burning is a chemical reaction between a fuel and an oxidant. Furthermore, respiration is a biochemical process occurring inside the cell while burning is a chemical process that is non-cellular.
Respiration and burning are two processes that release energy stored in chemical bonds of compounds. During respiration, the sequential breakdown of chemical bonds slowly releases energy stored in ATP; however, during burning, the breakdown of all chemical bonds quickly releases energy in the form of heat.
Hence, the correct option is (C).
Question 4
1 / -0

Gaseous exchange in plants during respiration occurs by

A
diffusion

B
osmosis

C
plasmolysis

D
facilitated diffusion

Solution

The leaves of plants have tiny pores on their surface which are called stomata. The exchange of gases in the leaves during respiration takes place through stomata. This happens as follows: Oxygen from the air enters into a leaf through stomata and reaches all the cells by the process of diffusion.
Hence, the correct option is (A).
Question 5
1 / -0

Where does the exchange of gases take place in humans?

A
Alveoli

B
Bronchi

C
Trachea

D
Bronchioles

Solution

The exchange of gases takes place within the respiratory system in alveoli. The principal task of the respiratory system is to supply the blood with oxygen for the blood to supply oxygen to all body parts. The respiratory system performs this through breathing.
Hence, the correct option is (A).
Question 6
1 / -0

In the cell, breakdown of glucose to pyruvate takes place in __________.

A
mitochondria

B
golgiapparatus

C
cytoplasm

D
nucleus

Solution

Glycolysis takes place in the cytoplasm of a cell as the first step in cellular respiration of the Kreb’s cycle. When glycolysis occurs, it breaks down glucose into pyruvic acids in the cytoplasm. There are many different kinds of pathways and processes that occur in our bodies.
Hence, the correct option is (C).
Question 7
1 / -0

________ prevent(s) the air passage from collapsing.

A
Rings of cartilage

B
Alveoli

C
Ribs

D
Diaphragm

Solution

The trachea or the windpipe connects the pharynx and larynx to our lungs This allows air to pass in and out of the lungs.
As the trachea is made of cartilaginous rings which are of C shape, it prevents the air passage not to collapse when we breathe out air.
Hence, the correct option is (A).
Question 8
1 / -0

Which organ of respiratory tract is involved in gaseous exchange?

A
Lungs

B
Larynx

C
Trachea

D
Pharynx

Solution

Gas exchange takes place only in the lungs, which are the largest organs of the respiratory tract. Lung tissue consists mainly of tiny air sacs called alveoli, which is where gas exchange takes place between the air in the alveoli and the blood in capillaries surrounding them.
Hence, the correct option is (A).
Question 9
1 / -0

Which of the following statements is not true?

A
Haemoglobin has high affinity for oxygen.

B
Oxygen is mostly transported in dissolved form in blood.

C
Inner surface of alveoli is kept moist.

D
Alveoli are richly supplied by blood vessels.

Solution

Oxygen is carried in the blood in two forms. Most oxygen is carried in combination with hemoglobin but some is carried as dissolved oxygen. Under normal conditions in arterial blood, 0.3 mL of dissolved oxygen is carried per 100 mL of blood. The amount of oxygen transported by hemoglobin is much greater than that carried in the dissolved form.
Hence, the correct option is (B).
Question 10
1 / -0

Inspiration and expiration are assisted by movements of _________.

A
diaphragm

B
alveoli

C
trachea

D
larynx

Solution

The processes of inspiration (breathing in) and expiration (breathing out) are vital for providing oxygen to tissues and removing carbon dioxide from the body. Inspiration occurs via active contraction of muscles – such as the diaphragm – whereas expiration tends to be passive unless it is forced.
Hence, the correct option is (A).

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Life Processes Test - 27

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Life Processes Test - 27

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SHARING IS CARING

Question 1

Water + CO2

Alcohol + CO2

CO2

Alcohol

Solution

Question 2

intake of O2

liberation of O2

intake of CO2

liberation of energy

Solution

Question 3

burning consumes O2, but respiration consumes CO2

burning liberates CO2, but respiration liberates O2

burning is a physicochemical process, but respiration is a biochemical process

burning is an endothermic reaction, but respiration is an exothermic reaction

Solution

Question 4

diffusion

osmosis

plasmolysis

facilitated diffusion

Solution

Question 5

Alveoli

Bronchi

Trachea

Bronchioles

Solution

Question 6

mitochondria

golgiapparatus

cytoplasm

nucleus

Solution

Question 7

Rings of cartilage

Alveoli

Ribs

Diaphragm

Solution

Question 8

Lungs

Larynx

Trachea

Pharynx

Solution

Question 9

Haemoglobin has high affinity for oxygen.

Oxygen is mostly transported in dissolved form in blood.

Inner surface of alveoli is kept moist.

Alveoli are richly supplied by blood vessels.

Solution

Question 10

diaphragm

alveoli

trachea

larynx

Solution

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Water + CO₂

Alcohol + CO₂

CO₂

intake of O₂

liberation of O₂

intake of CO₂

burning consumes O₂, but respiration consumes CO₂

burning liberates CO₂, but respiration liberates O₂