*UPDATED* For 2022-23 Boards Exam
SHOBHIT NIRWAN's
DESIGNED
LIFE PROCESSES
NOTES
, (L.P.) : What processes would you consider essential for maintaining life?
Four basic processes that are essential for maintaining life processes are-
1. Nutrition- it is the process of transferring source of energy(food) from outside to the
body of an organism.
2. Respiration- it is the process of acquiring oxygen from outside into the body and using
it for breaking down of glucose to release energy for cellular needs.
3. Transportation- it is process of carrying food and oxygen from one place to
another.
4. Excretion- it is a process of removing by-products from body which are formed
during energy generating reactions.
(L.P.) : Which are outside raw materials used by an organism?
Carbon based molecules i.e food is used by body from outside to meet it’s energy need.
Oxygen is used to oxidise food and release energy. So food and oxygen are the basic
raw materials used by an organism.
(L.P.) : Transportation system transports waste products then what is the need
of excretory system?
Transportation system transports waste products away from cells but to discard it
from the body to outside excretory system is needed.
(L.P.) : Name the process used by single celled organisms for ingestion of food,
gaseous exchange and waste removal? Why is this process insufficient to
meet the oxygen requirements in multicellular organisms?
Diffusion is the process used by single celled organisms to carry out basic life processes
such as gas exchange, etc.
It is insufficient because multicellular organisms like humans have complex body designs
and large body size. Thus they bear specialised cells and tissue for performing various
tasks.
Unlike unicellular,multicellular organisms do not have the cells in direct contact with
environment. Hence, diffusion cannot meet their oxygen requirements.
, NUTRITION
Kuch Kaam Ki Baat (K3B) :
, (L.P.) : How does the turgor pressure of guard cells regulate stomatal pore?
The turgor pressure of guard cells regulates the opening and closing of stomatal pores.
The stomatal pores are open when guard cells are turgid due to absorption of water
and get closed when guard cells are in flaccid condition due to loss of water.
SHOBHIT NIRWAN's
DESIGNED
LIFE PROCESSES
NOTES
, (L.P.) : What processes would you consider essential for maintaining life?
Four basic processes that are essential for maintaining life processes are-
1. Nutrition- it is the process of transferring source of energy(food) from outside to the
body of an organism.
2. Respiration- it is the process of acquiring oxygen from outside into the body and using
it for breaking down of glucose to release energy for cellular needs.
3. Transportation- it is process of carrying food and oxygen from one place to
another.
4. Excretion- it is a process of removing by-products from body which are formed
during energy generating reactions.
(L.P.) : Which are outside raw materials used by an organism?
Carbon based molecules i.e food is used by body from outside to meet it’s energy need.
Oxygen is used to oxidise food and release energy. So food and oxygen are the basic
raw materials used by an organism.
(L.P.) : Transportation system transports waste products then what is the need
of excretory system?
Transportation system transports waste products away from cells but to discard it
from the body to outside excretory system is needed.
(L.P.) : Name the process used by single celled organisms for ingestion of food,
gaseous exchange and waste removal? Why is this process insufficient to
meet the oxygen requirements in multicellular organisms?
Diffusion is the process used by single celled organisms to carry out basic life processes
such as gas exchange, etc.
It is insufficient because multicellular organisms like humans have complex body designs
and large body size. Thus they bear specialised cells and tissue for performing various
tasks.
Unlike unicellular,multicellular organisms do not have the cells in direct contact with
environment. Hence, diffusion cannot meet their oxygen requirements.
, NUTRITION
Kuch Kaam Ki Baat (K3B) :
, (L.P.) : How does the turgor pressure of guard cells regulate stomatal pore?
The turgor pressure of guard cells regulates the opening and closing of stomatal pores.
The stomatal pores are open when guard cells are turgid due to absorption of water
and get closed when guard cells are in flaccid condition due to loss of water.
