6 LIFE PROCESSES
PREVIOUS YEARS' QUESTIONS
2019
Short Answer Type [I] Questions [2 Marks]
1, Write two different ways in which glucose is oxidised to provide energy in human body.
Write products formed in each case.
[Delhi
Ans. Two different ways in which glucose is oxidised to provide energy in Human body and
their products are
) Lack of oxygen: Lactic acid and energy
() Presence of oxygen: Carbon dioxide, water and energy.
2. How is 0, and CO, transported in human beings? (Delhi
ADs. Oygen and carbon dioxide are transported in human beings with a gas transportation
system. This system is mainly composed of following parts:
Lungs: Lungs help in breathing in oxygen-rich air and breathing out carbon dioxide-
rich air.
eart: Heart pumps deoxygenated blood to lungs for oxygenation and pumps oxygenated
blood to different organs of the body.
Veins usually carry deoxygenated blood from different parts of the body to the
cart One exception is the pulmonary vein which carries oxygenated blood from lungs
to heart.
of the
h Arteries usually carry oxygenated blood from heart to different parts
blood from
exKception is the pulmonary artery which carries deoxygenated
heart toe lungs.
3.
List
Ans. The two differeat functions performed by pancreas in our body. (Delhi
different
Terent fun
functions
G) Pancreasssecretes]
performed by pancreas in our body are:
enzyme trypsin.
i) 1 as secretes pancreaticjuice which contains protein digesting
SeCretes lipase
for breakingdown emulsified fats.
, (Science)-10
154 Chapterwise CBSE PYQs
Short Answer Type [I4 Questions [3 Marks]
feature of each.
of blood vessels. Give one important Delhi
4. Write three types
feature are as follows:
vessels with one important
Ans. Three different types of
blood
) Arteries carry oxygenated
blood
(tü) Veins carry deoxygenated
-
(i) Capillaries Exchange of O, CO,,
dissolved nutrients and excretory producs
takes place.
5. Define the term transpiration. Design an experiment to demonstrate this process
Delhi
Ans. Transpiration is defined as the loss of water in the form
of vapour from the aerial parts of a plant.
Experiment to demonstrate transpiration
(a) Materials required: 2 transparent plastic glass, square
cardboard, one small plant, vaseline, water and scissor.
6) Method: A small hole need to be made at the centre
of the cardboard. The plant stem to be passed through
the hole and the gap to be sealed with vaseline. The
bottom glass to be filled with water and the roots
of the plant to be dipped in the water. The
plant to
be covered with the other glass from
top. When the
arrangement is kept in sunlight for 3-4 hours, droplets
of water will be observed on the sides of the inverted Arrangement showing
glass which is due to transpiration experiment
transpiration.
6. What is
photosynthesis? Explain its mechanism. Delhil
Ans. Photosynthesis is a process in which green plants convert carbon di oxide ter
into carbohydrates in and
presence of sunlight and zed
to provide energy to the chlorophyll. Carbohydrates are uu
plant.
Mechanism
6CO, +12H,O CH,,O, +
60, +
6HO
The following events occur during the process:
) Light energy is absorbed
by chlorophyll
(i) Light energy is converted to chemical t into
hydrogen and oxygen. energy and water molecules are
sp
(ii) Carbon dioxide is then reduced to
carbohydrate.
, Life Processes 155
List in tabular form three distinguishing features between autotrophic nutrition and
heterotrophic nutrition.
[AI Allahabad]
Differences between Autothropic nutrition and heterotrophic nutrition
Autotrophic Nutrition Heterotrophic Nutrition
1. Organisms make their food from CO, 1. Organisms derive their food from other
and water in presence of sunlight and
living organisms.
chlorophyl.
2. All green plants are autrophic and use 2. The energy is derived from intake
sunlight as a source of energy.
and
digestion of organic substances
3. Energy received from autotrophic nutrition| 3. Energy received from heterotrphic
is more. nutrition is less.
8. What is transpiration? List its two functions. [AI Allahabad]
Ans. Transpiration is defined as the process by which plants lose water in the vapour form
from the aerial parts of the plants.
Functions of transpiration:
) Transpiration helps to remove excess water
() Transpiration helps to regulate the temperature of the plant.
9. (a) What is translocation? Why is it essential for
plants?
(b) Where do the substances in plants reach as a result of translecation? [AI Allahabad]
Ans. (a) Translocation is the transport of food from the leaves to other
parts of the plant
and occurs in the part of the vascular tissue known as
phloem.
Translocation is essential because every part of the plant needs food for
obtaining
energy, for building its parts and maintaining its life.
6) Substances reach all parts of the plant by the network of phloem as a result of
translocation.
2018
Long Answer Type Questions [5 Marks]
.a)Mention any two components of blood.
Trace the movement of oxygenated blood in the body.
C)Write the function of valves present in between atria and ventricles.
Write one structural difference between the composition of artery and veins.
ICBSE
B l o o d is composed of plasma and three types of cells-Red blood cells, white
blood cells and
platelets.
Oxygenated blood from the lungs is brought to the left atrium by pulmonary
veins.
PREVIOUS YEARS' QUESTIONS
2019
Short Answer Type [I] Questions [2 Marks]
1, Write two different ways in which glucose is oxidised to provide energy in human body.
Write products formed in each case.
[Delhi
Ans. Two different ways in which glucose is oxidised to provide energy in Human body and
their products are
) Lack of oxygen: Lactic acid and energy
() Presence of oxygen: Carbon dioxide, water and energy.
2. How is 0, and CO, transported in human beings? (Delhi
ADs. Oygen and carbon dioxide are transported in human beings with a gas transportation
system. This system is mainly composed of following parts:
Lungs: Lungs help in breathing in oxygen-rich air and breathing out carbon dioxide-
rich air.
eart: Heart pumps deoxygenated blood to lungs for oxygenation and pumps oxygenated
blood to different organs of the body.
Veins usually carry deoxygenated blood from different parts of the body to the
cart One exception is the pulmonary vein which carries oxygenated blood from lungs
to heart.
of the
h Arteries usually carry oxygenated blood from heart to different parts
blood from
exKception is the pulmonary artery which carries deoxygenated
heart toe lungs.
3.
List
Ans. The two differeat functions performed by pancreas in our body. (Delhi
different
Terent fun
functions
G) Pancreasssecretes]
performed by pancreas in our body are:
enzyme trypsin.
i) 1 as secretes pancreaticjuice which contains protein digesting
SeCretes lipase
for breakingdown emulsified fats.
, (Science)-10
154 Chapterwise CBSE PYQs
Short Answer Type [I4 Questions [3 Marks]
feature of each.
of blood vessels. Give one important Delhi
4. Write three types
feature are as follows:
vessels with one important
Ans. Three different types of
blood
) Arteries carry oxygenated
blood
(tü) Veins carry deoxygenated
-
(i) Capillaries Exchange of O, CO,,
dissolved nutrients and excretory producs
takes place.
5. Define the term transpiration. Design an experiment to demonstrate this process
Delhi
Ans. Transpiration is defined as the loss of water in the form
of vapour from the aerial parts of a plant.
Experiment to demonstrate transpiration
(a) Materials required: 2 transparent plastic glass, square
cardboard, one small plant, vaseline, water and scissor.
6) Method: A small hole need to be made at the centre
of the cardboard. The plant stem to be passed through
the hole and the gap to be sealed with vaseline. The
bottom glass to be filled with water and the roots
of the plant to be dipped in the water. The
plant to
be covered with the other glass from
top. When the
arrangement is kept in sunlight for 3-4 hours, droplets
of water will be observed on the sides of the inverted Arrangement showing
glass which is due to transpiration experiment
transpiration.
6. What is
photosynthesis? Explain its mechanism. Delhil
Ans. Photosynthesis is a process in which green plants convert carbon di oxide ter
into carbohydrates in and
presence of sunlight and zed
to provide energy to the chlorophyll. Carbohydrates are uu
plant.
Mechanism
6CO, +12H,O CH,,O, +
60, +
6HO
The following events occur during the process:
) Light energy is absorbed
by chlorophyll
(i) Light energy is converted to chemical t into
hydrogen and oxygen. energy and water molecules are
sp
(ii) Carbon dioxide is then reduced to
carbohydrate.
, Life Processes 155
List in tabular form three distinguishing features between autotrophic nutrition and
heterotrophic nutrition.
[AI Allahabad]
Differences between Autothropic nutrition and heterotrophic nutrition
Autotrophic Nutrition Heterotrophic Nutrition
1. Organisms make their food from CO, 1. Organisms derive their food from other
and water in presence of sunlight and
living organisms.
chlorophyl.
2. All green plants are autrophic and use 2. The energy is derived from intake
sunlight as a source of energy.
and
digestion of organic substances
3. Energy received from autotrophic nutrition| 3. Energy received from heterotrphic
is more. nutrition is less.
8. What is transpiration? List its two functions. [AI Allahabad]
Ans. Transpiration is defined as the process by which plants lose water in the vapour form
from the aerial parts of the plants.
Functions of transpiration:
) Transpiration helps to remove excess water
() Transpiration helps to regulate the temperature of the plant.
9. (a) What is translocation? Why is it essential for
plants?
(b) Where do the substances in plants reach as a result of translecation? [AI Allahabad]
Ans. (a) Translocation is the transport of food from the leaves to other
parts of the plant
and occurs in the part of the vascular tissue known as
phloem.
Translocation is essential because every part of the plant needs food for
obtaining
energy, for building its parts and maintaining its life.
6) Substances reach all parts of the plant by the network of phloem as a result of
translocation.
2018
Long Answer Type Questions [5 Marks]
.a)Mention any two components of blood.
Trace the movement of oxygenated blood in the body.
C)Write the function of valves present in between atria and ventricles.
Write one structural difference between the composition of artery and veins.
ICBSE
B l o o d is composed of plasma and three types of cells-Red blood cells, white
blood cells and
platelets.
Oxygenated blood from the lungs is brought to the left atrium by pulmonary
veins.
