SUMMARY: The chapter "Life Processes" in Class 10 Science focuses on the essential processes that are vital for the maintenance of life in living organisms. KEY TOPICS: Nutrition, Respiration, Transportation, Excretion, Autotrophic nutrition, Heterotrophic nutrition, Human digestive system, Photosynthesis, Blood circulation, Excretory system in humans.
What is the role of chlorophyll in photosynthesis?
AAbsorbs water
BAbsorbs sunlight
CReleases oxygen
DTransports nutrients
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Correct answer: Option 2 — Absorbs sunlight
Q71 Mark
Which component of blood is primarily responsible for the transport of oxygen?
APlasma
BWhite blood cells
CRed blood cells
DPlatelets
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Correct answer: Option 3 — Red blood cells
Q81 Mark
What is the waste product of cellular respiration?
AOxygen
BCarbon dioxide
CGlucose
DWater
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Correct answer: Option 2 — Carbon dioxide
Q91 Mark
Which part of the human excretory system filters blood to form urine?
AKidneys
BLiver
CBladder
DUreters
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Correct answer: Option 1 — Kidneys
Q101 Mark
What is the primary function of the large intestine in the human digestive system?
AAbsorption of nutrients
BDigestion of proteins
CAbsorption of water and electrolytes
DProduction of bile
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Correct answer: Option 3 — Absorption of water and electrolytes
Q111 Mark
Which process is directly involved in the release of energy from glucose?
APhotosynthesis
BRespiration
CDigestion
DTranspiration
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Correct answer: Option 2 — Respiration
Q121 Mark
What type of nutrition do humans primarily exhibit?
AAutotrophic
BHeterotrophic
CChemosynthetic
DParasitic
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Correct answer: Option 2 — Heterotrophic
Q131 Mark
Which organ is responsible for detoxifying harmful substances in the body?
AKidney
BLiver
CHeart
DLungs
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Correct answer: Option 2 — Liver
Q141 Mark
What is the main byproduct of photosynthesis?
AGlucose
BOxygen
CCarbon dioxide
DWater
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Correct answer: Option 2 — Oxygen
Q151 Mark
Which of the following is NOT a function of the excretory system?
ARegulation of blood pressure
BRemoval of metabolic waste
CAbsorption of nutrients
DRegulation of water balance
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Correct answer: Option 3 — Absorption of nutrients
Short Answer Questions10 questions
Q163 Marks
What is autotrophic nutrition? Provide an example.
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Autotrophic nutrition is the process by which organisms produce their own food using inorganic substances. An example of autotrophic nutrition is photosynthesis in plants, where they convert sunlight, carbon dioxide, and water into glucose and oxygen.
Q173 Marks
Explain the role of chlorophyll in photosynthesis.
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Chlorophyll is a green pigment found in the chloroplasts of plants that absorbs light energy, primarily from the sun. This energy is used to convert carbon dioxide and water into glucose during the process of photosynthesis.
Q183 Marks
Describe the process of respiration in humans.
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Respiration in humans involves the intake of oxygen and the release of carbon dioxide. It occurs in two stages: external respiration (gas exchange in the lungs) and internal respiration (cellular respiration where glucose is broken down to release energy).
Q193 Marks
What are the main components of the human digestive system?
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The main components of the human digestive system include the mouth, esophagus, stomach, small intestine, large intestine, rectum, and anus. Each part plays a crucial role in the digestion and absorption of nutrients.
Q203 Marks
Differentiate between heterotrophic and autotrophic nutrition.
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Heterotrophic nutrition involves organisms obtaining food from other living organisms, while autotrophic nutrition involves organisms producing their own food from inorganic substances. Examples include animals for heterotrophs and plants for autotrophs.
Q213 Marks
What is the significance of blood circulation in the human body?
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Blood circulation is vital for transporting oxygen, nutrients, hormones, and waste products throughout the body. It ensures that all cells receive the necessary substances for metabolism and helps maintain homeostasis.
Q223 Marks
Explain the process of excretion in humans.
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Excretion in humans is the process of removing waste products from the body, primarily through the kidneys. The kidneys filter blood to produce urine, which is then expelled from the body through the urinary system.
Q233 Marks
What is the function of the small intestine in the digestive system?
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The small intestine is responsible for the majority of digestion and nutrient absorption. It breaks down food using enzymes and absorbs nutrients into the bloodstream through its walls.
Q243 Marks
How does photosynthesis benefit heterotrophic organisms?
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Photosynthesis benefits heterotrophic organisms by producing oxygen and organic compounds (like glucose) that serve as food. Heterotrophs rely on autotrophs for energy and essential nutrients.
Q253 Marks
Describe the structure and function of the human excretory system.
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The human excretory system consists of kidneys, ureters, bladder, and urethra. Its main function is to filter blood, remove waste products, and regulate water and electrolyte balance in the body.
Long Answer Questions6 questions
Q266 Marks
Explain the process of photosynthesis, including the role of chlorophyll and the importance of sunlight in this process.
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Photosynthesis is the process by which green plants, algae, and some bacteria convert light energy into chemical energy in the form of glucose. This process primarily occurs in the chloroplasts of plant cells, where chlorophyll, the green pigment, captures sunlight. During photosynthesis, carbon dioxide from the atmosphere and water absorbed by the roots are converted into glucose and oxygen. The overall equation for photosynthesis can be summarized as: 6CO2 + 6H2O + light energy → C6H12O6 + 6O2. Sunlight is crucial as it provides the energy required to drive the reactions, making photosynthesis essential for life on Earth as it produces oxygen and organic compounds that serve as food for various organisms.
Q276 Marks
Describe the human digestive system, highlighting the role of each organ involved in the process of digestion.
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The human digestive system is a complex series of organs that work together to break down food into nutrients. It begins in the mouth, where mechanical digestion occurs through chewing, and saliva begins the chemical breakdown of carbohydrates. The food then travels down the esophagus to the stomach, where gastric juices further digest it. The partially digested food moves into the small intestine, where most nutrient absorption takes place, aided by enzymes from the pancreas and bile from the liver. The remaining undigested food passes into the large intestine, where water is absorbed, and the waste is eventually excreted. Each organ plays a vital role in ensuring that food is effectively processed and nutrients are made available to the body.
Q286 Marks
What are the differences between autotrophic and heterotrophic nutrition? Provide examples of organisms for each type.
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Autotrophic nutrition is the process by which organisms produce their own food using inorganic substances. This is primarily seen in plants, which use photosynthesis to convert sunlight, carbon dioxide, and water into glucose. Examples of autotrophs include green plants, algae, and some bacteria. In contrast, heterotrophic nutrition involves organisms that cannot synthesize their own food and must obtain it from other living beings. This includes animals, fungi, and many bacteria that consume organic matter. For instance, humans and other animals are heterotrophs as they rely on consuming plants and other animals for energy and nutrients.
Q296 Marks
Explain the process of respiration in humans, including the role of the respiratory system and the exchange of gases.
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Respiration in humans is the process of taking in oxygen and expelling carbon dioxide, which occurs in the respiratory system. The process begins when air is inhaled through the nose or mouth, traveling down the trachea and into the lungs. In the lungs, oxygen from the air diffuses into the bloodstream through the alveoli, tiny air sacs surrounded by capillaries. Simultaneously, carbon dioxide, a waste product of cellular respiration, diffuses from the blood into the alveoli to be exhaled. This gas exchange is crucial for maintaining the body’s oxygen levels and removing carbon dioxide, thus supporting cellular metabolism and energy production.
Q306 Marks
Discuss the importance of blood circulation in the human body and the role of the heart in this process.
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Blood circulation is vital for maintaining homeostasis in the human body, as it transports oxygen, nutrients, hormones, and waste products to and from cells. The heart, a muscular organ, plays a central role in this system by pumping blood through a network of arteries, veins, and capillaries. The circulatory system is divided into two main circuits: the systemic circuit, which delivers oxygenated blood to the body, and the pulmonary circuit, which carries deoxygenated blood to the lungs for oxygenation. The heart's rhythmic contractions ensure that blood flows efficiently, supporting vital functions such as temperature regulation, immune response, and nutrient distribution.
Q316 Marks
What is the excretory system in humans, and how does it function to maintain homeostasis?
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The excretory system in humans is responsible for the removal of waste products from the body and maintaining the balance of water and electrolytes. The primary organs involved are the kidneys, which filter blood to produce urine. Each kidney contains nephrons, the functional units that filter out waste, excess salts, and water. The urine produced is transported to the bladder for storage and is eventually excreted through the urethra. This system plays a critical role in homeostasis by regulating blood pressure, electrolyte levels, and the body's overall fluid balance, ensuring that harmful substances do not accumulate in the body.
Assertion–Reason Questions8 questions
Q321 Mark
Assertion (A): Photosynthesis is the process by which plants convert sunlight into energy.
Reason (R): Photosynthesis occurs in the chloroplasts of plant cells using chlorophyll.
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Correct answer: Option 1 —
Both A and R are true, and R is the correct explanation of A.
Q331 Mark
Assertion (A): The human digestive system includes the stomach and intestines.
Reason (R): The stomach is responsible for the absorption of nutrients into the bloodstream.
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Correct answer: Option 3 —
A is true, but R is false.
Q341 Mark
Assertion (A): Heterotrophic nutrition is the mode of nutrition in which organisms produce their own food.
Reason (R): Heterotrophs depend on other organisms for food.
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Correct answer: Option 4 —
A is false, but R is true.
Q351 Mark
Assertion (A): The circulatory system in humans transports oxygen and nutrients to cells.
Reason (R): The heart pumps blood through a network of arteries and veins.
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Correct answer: Option 1 —
Both A and R are true, and R is the correct explanation of A.
Q361 Mark
Assertion (A): Excretion is the process of removing waste products from the body.
Reason (R): The kidneys play a vital role in filtering blood and producing urine.
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Correct answer: Option 1 —
Both A and R are true, and R is the correct explanation of A.
Q371 Mark
Assertion (A): Autotrophic nutrition is exclusive to animals.
Reason (R): Plants and some bacteria can perform autotrophic nutrition through photosynthesis.
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Correct answer: Option 3 —
A is true, but R is false.
Q381 Mark
Assertion (A): Respiration is the process of breaking down glucose to release energy.
Reason (R): Respiration occurs in all living organisms, including plants and animals.
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Correct answer: Option 1 —
Both A and R are true, and R is the correct explanation of A.
Q391 Mark
Assertion (A): The process of photosynthesis releases carbon dioxide as a byproduct.
Reason (R): Photosynthesis uses carbon dioxide and releases oxygen into the atmosphere.
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Correct answer: Option 4 —
A is false, but R is true.
Statement-Based Questions8 questions
Q401 Mark
Statement 1: Autotrophic nutrition involves the synthesis of food from inorganic substances.
Statement 2: Heterotrophic nutrition requires organisms to consume other organisms for energy.
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Correct answer: Option 1 —
Both statements are true.
Q411 Mark
Statement 1: Photosynthesis occurs in the mitochondria of plant cells.
Statement 2: Chlorophyll is essential for photosynthesis to take place in plants.
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Correct answer: Option 3 —
Only Statement 2 is true.
Q421 Mark
Statement 1: The human digestive system includes the stomach and intestines.
Statement 2: Digestion of proteins begins in the small intestine.
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Correct answer: Option 2 —
Only Statement 1 is true.
Q431 Mark
Statement 1: The circulatory system in humans is responsible for transporting oxygen and nutrients.
Statement 2: The heart pumps blood through veins only.
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Correct answer: Option 4 —
Both statements are false.
Q441 Mark
Statement 1: Excretion is the process of removing waste products from the body.
Statement 2: The kidneys are part of the excretory system in humans.
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Correct answer: Option 1 —
Both statements are true.
Q451 Mark
Statement 1: Respiration is a process that occurs only in animals.
Statement 2: Aerobic respiration requires oxygen to produce energy.
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Correct answer: Option 3 —
Only Statement 2 is true.
Q461 Mark
Statement 1: In autotrophic nutrition, organisms like plants produce their own food.
Statement 2: Heterotrophic organisms can perform photosynthesis.
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Correct answer: Option 4 —
Both statements are false.
Q471 Mark
Statement 1: Blood circulation in humans is facilitated by the heart and blood vessels.
Statement 2: The liver plays a major role in the transportation of oxygen in the blood.
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Correct answer: Option 2 —
Only Statement 1 is true.
