10 Science Notes 06 Life Processes 11
10 Science Notes 06 Life Processes 11
10 Science Notes 06 Life Processes 11
CHAPTER – 6
LIFE PROCESSES
All living things perform certain life processes like growth, excretion, respiration,
circulation etc.
All the processes like respiration, digestion, which together keep the living organisms
alive and perform the job of body maintenance are called life processes.
Examples :
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Autotrophic Nutrition :
The organisms which carry out autotrophic nutrition are called autotrophs (green
plants)
Autotrophic nutrition is fulfilled by the process by which autotrophs take in CO2 and
H2O and convert these into carlohydrates in the presence of chlorophyll, sunlight is
called PHOTOSYNTHESIS
Equation :
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Small Intestinal
Small Intestine Villi → helps in absorption of food into the blood.
[finger like projections]
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Respiration
Respiration involves
(i) Gaseous exchange : Intake of oxygen from the atmosphere and release of
CO2 → Breathing
(ii) Breakdown of simple food in order to release energy inside the cell → Cellular
Respiration
Breakdown of Glucose by various pathways
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Blood
(A fluid Connective Tissue)
- Lymph - a yellowish fluids escapes from the blood capillaries into the
intercellular spaces contain less proteins than blood. Lymph flows from the
tissues to the heart assisting in transportation and destroying germs.
Blood Vessels
Arteries Veins
1. Carry Oxygenated blood from 1. Carry deoxygenated blood
heart to body part except from body parts to heart
pulmonary Artery except pulmonary vein.
2. Also called distributing Vessel 2. Also called collecting Vessel.
3. Thick and elastic 3. Thin and Less elastic.
Transportation in Plants
- There are two main conducting Pathways in a Plant
Xylem Phloem
1. Carries water & minerals 1. Carries product of
from the roots to other part photosynthesis from leaves
of the plant to the other part of the plant.
2. No energy is used. 2. Energy is used from ATP
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– Transpiration is the process of loss of water as vapour from aerial parts of the
plant.
Function :
1. Absorption and upward movement of water and minerals by creating
PULL.
2. helps in temperature regulation in Plant.
– Transport of food from leaves (food factory) to different part of the plant is
called Translocation.
EXCRETION
– The process of the removal of the harmful metabolic wastes from the body.
– Excretory system of human beings includes :
1) A pair of kidneys
ii) A Urinary Bladder
iii) A pair of Ureter
iv) A Urethera
– Urine produced in the kidneys passes through the ureters into the urinary
bladder where it is stored until it is released through the urethera.
– The purpose of making urine is to filter out waste product from the blood ie,
urea which is produced in the liver.
– Each kidney has large numbers of filtration units called nephrons.
– The Urine formation involves three steps
1. Glomerular Filtration : Nitrogenous wastes, glucose water, amino acid
filter from the blood into Bowman Capsule of the nephron.
2. Tubular reabsorption : Now, useful substances from the filtrate are
reabsorbed back by capillaries surrounding the nephron.
3. Secretion Extra, water, salts are secreted into the tubule which open up
into the collecting duct & then into the ureter.
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Through stomata
– Oxygen, CO2 & H2O (Transpiration)
– Other wastes may be stored in leaves, bark etc. which fall off from the plant.
– Plants excrete some waste into the soil around them.
– Gums, Resin fi
In old Xylem
– Some metabolic wastes in the form of crystals of Calcium oxalates in the
leaves of colocasia and stem of Zamikand.
Life Processes
EXERCISE
(Question Bank)
Very Short Answers (1 Mark)
1. State one difference between autotrophic and heterotrophic mode of
nutrition.
2. What will happen to a plant if the xylem is removed.
3. What is the role of saliva in the digestion of food?
4. Name the tissue that transports water and minerals in plants.
5. What is the role of acid in our stomach?
6. What is emulsification
7. Name the organelle in which photosynthesis occur.
8. Name the largest artery in the human body.
9. Define transpiration
10. What are structural and functional unit of kidneys called.
Short Answers (2 Marks or 3 Marks)
1. How is small intestine designed to absorb digested food?
2. What are stomata? Draw a labelled diagram of stomata.
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