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Class 10 biology life processes important questions: MCQ:
Q) Which of the following enzymes needs an acidic medium to be active
(a) Trypsin
(b) Pepsin
(c) Lipase
(d) None of the above
Solution: (b) Pepsin
Q) During deficiency of oxygen in tissues of human beings, pyruvic acid is converted
into lactic acid in the:
(a)Cytoplasm
(b)Chloroplast
(d)Golgi body
(c)Mitochondria
Solution: (a) Cytoplasm
Q) The internal (cellular) energy reserve in autotrophs is:
(a)Glycogen
(b)Protein
(c)Starch
(d)Fatty acid
Solution: (c) Starch
Q) What prevents backflow of blood inside the heart during contraction:
(a)Thin walls of atria
(b)Valves in heart
(c)Thick muscular walls of ventricles
(d) All of the above
Solution: . (b) Valves in heart
Q) The energy currency of the cell is:
(a)ATP
(b)AMP
(c)CO₂
(d)ADP
Solution: . (a) ATP
Q) The blood leaving the tissues becomes richer in:
(a)Carbon-di-oxide
(b)Water
(c)Hemoglobin
(d)Oxygen
Solution: (d) Oxygen
Q) Which is the first enzyme that gets mixed with food in the digestive tract?
(a)Pepsin
(b)Cellulose
(c)Trypsin
(d)Amylase
Solution: (d) Amylase
Q) Complete the following reactions:
6CO₂ + 6H₂O +Sunlight + ? → C₆H₁₂O₆ + 6O₂
(a)Mitochondria
(b)Chlorophyll
(c)Iodine
(d)Carbon dioxide
Solution: b) Chlorophyll
Q) The opening and closing of the stomatal pore depends upon.
(a)Temperature
(b)Oxygen
(c)Concentration of CO₂ in stomata
(d)Water in guard cells
Solution: (d) Water in guard cells
Class 10 biology life processes important questions: Assertion and Reason Questions:
Instructions: In the following questions a statement of Assertion is followed by a statement of
Reason.
Mark the correct choice as two statements are given one labeled Assertion (A)
and the other labeled Reason (R). Select the correct answer to these questions
from the cods (a), (b), (c) and (d) as given below:
(a) Both A and R are true, and R is correct explanation of the assertion.
(b) Both A and R true, but R is not the correct explanation of the assertion.
(c) A is true, but R is false.
(d) A is false, but R is true.
Q) Assertion: Rate of breathing in aquatic organisms is slower than terrestrial
organisms.
Reason: The amount of dissolved oxygen is fairly low as compared to amount
oxygen in air.
Solution: (d) A is false, but R is true
Q) Assertion: The effect of root pressure in transport of water is more important
at night.
Reason: During the day the transpiration pull acts as major driving force in the
movement of water in the system.
Solution: . (b) Both A and R are true, but R is not the correct explanation of the
assertion.
Q) Assertion: The opening and closing of the pore of stomata is a function of the
guard cell.
Reason: The stomatal pore opens when water comes out of guard cells causing
their shrinkage.
Solution: . (a) Both A and R are true, and R is the correct explanation of the assertion.
Q) Assertion: Carnivores have a shorter small intestine.
Reason: Meat is easier to digest.
Solution: . (a) Both A and R are true, and R is the correct explanation of the assertion.
Q) Assertion: Plasma of blood transports food, carbon dioxide and nitrogenous
wastes.
Reason: Red blood corpuscles carry oxygen.
Solution: (b) Both A and R are true, but R is not the correct explanation of the assertion.
Class 10 biology life processes important questions: Very Short Answer Questions:
Q) Give Reasons:
(i) The number of stomata are more on the lower surface of the leaf as compared
to the upper surface.
(ii) Arteries are thick walled.
(iii) Plants have low energy needs.
(iv) Aquatic animals breathe faster than the terrestrial animals.
Solution: .(i)Stomata are more numerous on the lower side of the leaf to prevent
transpiration. Transpiration is the loss of water through stomata, so, more
stomata are found on the lower surface to prevent excessive loss of water.
(ii) Arteries have thick walls to withstand the high pressure of blood pumped
from the heart, ensuring efficient distribution of oxygenated blood to various
parts of the body.
(iii) Plant have low energy requirement because they are non motile
(iv) Oxygen is less soluble in water, so aquatic animals need to breathe faster to
meet their oxygen requirements.
Q) State one difference between autotrophic and heterotrophic mode of nutrition.
Solution: One difference between autotrophic and heterotrophic modes of nutrition is
that autotrophic organisms can synthesize their own food using simple
inorganic substances like carbon dioxide and water, whereas heterotrophic
organisms rely on other organisms for their food.
Q) Define peristaltic movement.
Solution: Peristaltic movement is the involuntary constriction and relaxation of
muscles in the walls of the gastrointestinal tract, which propels food and other
contents through the digestive system.
Q) What stops blood from flowing backwards through the heart. (CBSE 2008)
Solution: The aortic and pulmonic valves close, preventing backward blood flow
into the heart. The mitral and tricuspid valves then open to allow forward blood
flow within the heart to fill the ventricles again.
Q) Name the process used by single-celled organisms for taking in food, exchange of
gases or removal of wastes. (CBSE 2016)
Solution: Diffusion is the process used by single-celled organisms for taking in food,
exchange of gases or removal of wastes.
Q) Name the tissue that transports water and minerals in plants.
Solution: . The tissue that transports water and minerals in plants is called xylem
Q) What is the role of acid in our stomach?
Solution: The role of acid in our stomach is to help break down food particles into
smaller, more digestible components. It also helps in killing bacteria that may
be present in the food.
Q) What is the role of saliva in the digestion of food?
Solution: Saliva helps in the digestion of food by moistening and lubricating food
particles, which aids in swallowing. It also contains enzymes like amylase, which
begins the digestion of carbohydrates in the mouth.
Q) What is emulsification?
Solution: Emulsification is the process of breaking down large fat globules into smaller
droplets to increase the surface area for digestion by enzymes like lipase.
Q) Name the largest artery in the human body.
Solution: The largest artery in the human body is the aorta.
Q) Name the cell organelle in which photosynthesis occur.
Solution: The cell organelle in which photosynthesis occurs is the chloroplast.
Q) Define transpiration.
Solution: Transpiration is the process by which moisture is carried through plants
from roots to small pores on the underside of leaves, where it changes to vapor
and is released into the atmosphere.
Q) What is the structural and functional unit of kidney called?
Solution: The structural and functional unit of the kidney is called the nephron. It is
responsible for filtering blood and producing urine.
Class 10 biology life processes important questions: Short Answer Questions:
Q) Name the organ which perform the following functions in human
(i) Absorption of digested food
ii) Absorption of water
iii) Secretion of Bile juice.
Solution: . i) Small intestine
ii) Large intestine
iii) Liver (Bile juice is stored in the gallbladder and released into the small
intestine)
Q) Diagrammatically illustrate the process of utilization and digestion of food in
Amoeba.
Solution: Amoeba exhibits holozoic nutrition, a process involving several steps:
(i). Ingestion: Food particles are engulfed by amoeba using pseudopodia,
forming a food vacuole through a process called phagocytosis.
(ii). Digestion: Inside the food vacuole, enzymes break down the ingested food
into smaller, soluble particles.
(iii). Absorption: Digested nutrients diffuse from the food vacuole into the
cytoplasm of the amoeba.
(iv). Assimilation: The absorbed nutrients are utilized by the amoeba for energy,
growth, and repair of cell structures.
(v).Egestion: Undigested material or waste is expelled from the amoeba by the
rupturing of its cell membrane.
This process allows amoeba to obtain energy and nutrients from its
environment and eliminate waste products, enabling it to sustain life processes.
The Diagram is given below:
Class 10 biology life processes important questions. PYQs of Life Processes Class 10 PDF download with solution.Pic Credit: Pinterest
Q) Give two examples each of organisms which perform the following types of
nutrition.
a) Saprotrophic
b) Parasitic
c) Holozoic
Solution: The two examples each of organisms which perform the following types of
nutrition are :
a) Saprotrophic: Fungi, Bacteria
b) Parasitic: Tapeworm, Malaria parasite
c) Holozoic: Human, Lion
Q) What will happen if green plants disappear from earth?
Solution: . If green plants disappear from Earth, the entire food chain would be
disrupted. Since plants are primary producers, most other organisms rely on
them directly or indirectly for food. Herbivores would lose their food source,
leading to a decline in populations of carnivores and omnivores that depend on
them.
Q) Mention three major events that occur during photosynthesis?
Solution: Three major events that occur during photosynthesis are:
i) Absorption of light by chlorophyll
ii) Conversion of light energy into chemical energy
iii) Conversion of carbon dioxide and water into glucose and oxygen
Q) Name the energy currency in the living organisms. When and where it is
produced?
Solution: The energy currency in living organisms is ATP (Adenosine triphosphate). ATP
is produced during cellular respiration, primarily in the mitochondria of cells.
Q) How do carbohydrates, proteins and fats get digested in human beings?
Solution: The process of digestion of carbohydrates, protein,fat in human body is given
below:
•Carbohydrates are digested into simple sugars (glucose) by enzymes like
amylase in the mouth and small intestine.
•Proteins are digested into amino acids by enzymes like pepsin in the stomach
and trypsin in the small intestine.
•Fats are digested into fatty acids and glycerol by enzymes like lipase in the
small intestine.
Q) Explain the three pathways of breakdown of glucose in living organisms.
Solution: .In all organisms, glucose is first converted into pyruvate. Glucose is a 6-
carbon molecule, while pyruvate is a 3-carbon molecule. This step is same in all
organisms and it happens in the cytoplasm. Further breakdown of pyruvate can
happen in any of the following ways:
•In Yeast: In yeast, breakdown of pyruvate take place in absence of oxygen. Due
to this, it is called anaerobic respiration. Pyruvate is broken down into ethanol
and carbon dioxide.
•In muscle cells: During strenuous physical activity, the energy demand from
muscle cells suddenly increases. This is compensated by anaerobic respiration
in muscle cells. In such a situation, pyruvate is broken down into lactic acid.
•In mitochondria: In this case, breakdown of pyruvate takes place in presence of
oxygen. Due to this, it is called aerobic respiration. Pyruvate is broken down into
carbon dioxide and water. Aerobic respiration is found in most of the living
beings.
Q) How is small intestine designed to absorb digested food?
Solution: The small intestine has millions of tiny finger-like projections called villi.
These villi increase the surface area for efficient food absorption. Within these
villi, many blood vessels are present that absorb the digested food and carry it
to the bloodstream. The absorbed food from the bloodstream is delivered to
every cell of the body
Q) Describe the process of double circulation in human beings.
Solution: Double circulation describes the fact that blood flows twice in the heart
before it completes one full round. One is pulmonary circulation and the other
is systemic circulation. Pulmonary circulation starts from the pulmonary artery
which divides into two branches which enter the respective lungs. Pulmonary
veins collect the oxygenated blood from the lungs and carry it back to the left
auricle of the heart.
Systemic circulation starts with aorta that arises from the
left ventricle. The aorta arches back and continues behind as aorta. The aorta
sends arteries to various parts of the body and tissues. From there, blood is
collected by veins and sent back to the heart.
Q) Define the term transpiration. Design an experiment to demonstrate transpiration.
Solution: Transpiration is defined as the evaporation of excess water from the
stomata present in the leaves of plants.
Experiment to show transpiration process:
Procedure:
(i) Take a healthy potted plant and cover the pot with the help of rubber sheet.
Aerial parts remain uncovered
(ii) Keep the plant on glass plate and cover it with a bell jar.
(iii) Apply Vaseline at the base of bell jar to prevent outer air coming inside.
(iv) Keep the whole apparatus is light and observe for sometime.
Observation : Water drops appear inside the bell jar
Result : Transpiration occurs from potted plant.
Class 10 biology life processes important questions: Long Answer Questions:
Q) (i) Write three types of blood vessels. Give one important feature of each
(CBSE, Delhi 2018-19)
ii) How are CO₂ and O₂ transported in human beings? (CBSE 2018-19)
Solution: (i). Blood vessels are an essential part of the circulatory system, responsible
for carrying blood throughout the body. They are classified into three types:
arteries, veins, and capillaries.
Arteries are vessels that carry oxygen-rich blood from the heart to the body’s
tissues. They branch into smaller arterioles as they extend away from the heart.
Veins, on the other hand, carry blood back to the heart from the body’s tissues.
Veins are larger in size near the heart. The superior vena cava transports blood
from the head and arms to the heart, while the inferior vena cava carries blood
from the abdominal region and legs to the heart.
Capillaries are tiny blood vessels that connect arteries and veins. They have
thin walls, allowing for the exchange of oxygen, nutrients, carbon dioxide, and
other waste products between the blood and cells.
(ii). Inhaled air is rich in oxygen and is carried to the lungs. The diffusion of
oxygen to the blood occurs in the capillaries, in alveoli, where the oxygen
combines with the hemoglobin to form oxyhemoglobin. This oxygen-rich blood
is taken to the heart, for distribution, via the pulmonary vein. The carbon
dioxide moves from the tissues to the plasma and red blood cells which are
carried to capillaries in alveoli via the pulmonary artery. Carbon dioxide diffuses
out from the capillaries in alveoli. The carbon dioxide rich air is at last expelled
from the body during exhalation while breathing.
Q) Write the function of the following in the human alimentary canal. (CBSE
2018-19)
(i) Saliva
ii) HCl in Stomach
iii) Bile juice
iv) Villi
Solution: The Function of the following in the human alimentary canal are:
i) Saliva: An enzyme in saliva called amylase begins to break down into maltose
sugar.
(ii) HCl in the stomach: The main function of hydrochloric acid in food is to kill
bacteria that may enter the stomach with food. It also helps in creating the
acidic environment or acidic pH required for the activation of inactive
pepsinogen.
(iii) Bile juice: It performs two major functions: It makes the acidic food coming
from the stomach alkaline so that the pancreatic enzymes can act on it. Also,
the bile salts break down the fats present in the food into small globules making
it easy for the enzymes to act and digest them.
(iv) Villi: Absorption of digested food occurs mainly in the small intestine
because it consists of many finger-like projections called villi that are supplied
with numerous blood vessels. They provide a large surface area for the
absorption of food.
Q) Write one function of each of the following enzymes.
i) Pepsin
ii) Lipase
Solution: The Function of the following enzymes are:
(i) Pepsin: Pepsin helps in the digestion of proteins into amino acids
(ii) Lipase: It is an enzyme that acts on emulsified fats (lipids) into digestible
form.
Q) Draw a well labelled diagram of Nephron. Explain the process of formation of
urine in the human kidney.
Solution: The process of urine formation in the kidneys, which is a crucial part of the
excretory system, involves three main steps:
•Glomerular Filtration: This is the initial stage where blood enters the kidney’s
nephrons, and the glomerulus filters out waste products, ions, and water from
the blood. This filtered fluid is known as the glomerular filtrate. Importantly,
substances like red blood cells and proteins are not filtered out due to their
large size.
•Tubular Reabsorption: As the glomerular filtrate moves through the renal
tubules, essential substances such as glucose, amino acids, and most of the
filtered water are reabsorbed back into the bloodstream. This reabsorption
occurs mainly in the proximal convoluted tubule and the loop of Henle. The
reabsorption of water is crucial for maintaining the body’s water balance.
•Tubular Secretion: In this step, certain substances, such as hydrogen ions,
potassium ions, and certain drugs, are actively secreted from the bloodstream
into the renal tubules. This process helps in the elimination of excess ions and
substances that were not filtered out initially.
After these processes, the remaining fluid, now called urine, flows through the
collecting ducts and into the renal pelvis, eventually being excreted from the
body through the ureters, bladder, and urethra.
These steps ensure that the body maintains proper fluid balance, electrolyte
levels, and eliminates waste products effectively
Class 10 biology life processes important questions. PYQs of Life Processes Class 10 PDF download with solution. Pic Credit: Pinterest
Q) Why is energy needs in plants is very less as compared to animals? Explain.
Solution: Animals require more energy than plants.This is due to various reasons. Some
are :
i) Animals are motile organisms whereas plants are non-motile. Being motile
requires more energy.
ii) Plants have many dead tissues whereas this is not in the case of animals.
Hence, again animals need more energy.
Plants being sessile stay at one place and lack the basic process of locomotion
while animals move from one place to another in search of food, shelter and
mates. The physical activity performed by the plants is also less when
compared to animals.
Q) Draw the diagram showing Human Respiratory System. Label the following
parts.
a) Alveolus
b) Trachea
c) Bronchus
d) Lungs
Solution:
Class 10 biology life processes important questions. PYQs of Life Processes Class 10 PDF download with solution. Pic Credit: Pinterest
Class 10 biology life processes important questions: Case based Question:
There is a progressive change in the structure of the heart among vertebrates,
from fishes to birds and mammals. Fish have a simple two-chambered heart.
Amphibians possess a three-chambered heart with two atria and a single
ventricle. Reptiles have a septum (wall) that partly divides the ventricle. Birds
and mammals have a four-chambered heart.
1. In fishes blood flows from heart to gills to body and back to heart. This is
example of
(a) Single circulation
(b) Double circulation
(c) Both (a) and (b)
(d) None of the above
2. Which of the following organisms shows mixing of oxygenated and
deoxygenated blood-
(a) Pigeon.
(b) Dog
(c) Frog
(d) Crocodile
3. Birds and mammals have four-chambered hearts as it leads to separation of
oxygenated and deoxygenated blood such a separation allows
(a) Highly efficient supply of oxygen to the body
(b) Give energy to maintain their body temperature continuously
(c) Double circulation being carried on efficiently
(d) Efficient of collection of blood from tissues of the body
Now choose the right option-
(a) (i) & (iv)
(b) (ii) & (iii)
c) (i) & (iii)
(d) (i), (ii) & (iii)
4. In which of the following vertebrate group/groups heart does not pump
oxygenated blood to different parts of the body-
(a) Pisces and Amphibians
(b) Amphibians and reptiles.
(c)Amphibians only
(d) Pisces only
5. Which chamber of human heart receives deoxygenated blood from tissues of
the body.
(a) Left atrium
(b) Right atrium
(c) Left ventricle
(d) Right ventricle
Solution: 1. (a) Single circulation
2. (c) Frog
3. (d) Efficientof collection of blood from tissues of the body
4. (d) Pisces only
5. (b) Right atrium
PYQs of Life Processes Class 10 PDF download with solution/Previous Year Questions of Life Processes Class 10 PDF download:
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PYQs of Life Processes Class 10 PDF download with solution
Previous Year Questions of Life Processes Class 10 PDF download/PYQs of Life Processes Class 10 PDF download with solution. Previous Year Questions of Life Processes Class 10 PDF download/PYQs of Life Processes Class 10 PDF download with solution.
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