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Excretion In Animals & Plants - 1 - Class 10 MCQ


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25 Questions MCQ Test Science Class 10 - Excretion In Animals & Plants - 1

Excretion In Animals & Plants - 1 for Class 10 2024 is part of Science Class 10 preparation. The Excretion In Animals & Plants - 1 questions and answers have been prepared according to the Class 10 exam syllabus.The Excretion In Animals & Plants - 1 MCQs are made for Class 10 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Excretion In Animals & Plants - 1 below.
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Excretion In Animals & Plants - 1 - Question 1

Unicellular organisms primarily remove metabolic wastes by __________ .

Detailed Solution for Excretion In Animals & Plants - 1 - Question 1


Unicellular organisms remove metabolic wastes by allowing them to diffuse from their body surface into the surrounding water.

Excretion In Animals & Plants - 1 - Question 2

What is the main purpose of the excretory system in human beings?

Detailed Solution for Excretion In Animals & Plants - 1 - Question 2
  • The main purpose of the excretory system in human beings is to remove waste products and excess substances from the body.
  • This system includes organs such as the kidneys, ureters, bladder, and urethra, which work together to filter blood, remove waste products (such as urea, creatinine, and excess salts), regulate water balance, and maintain the body's acid-base balance.
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Excretion In Animals & Plants - 1 - Question 3

Which organs are part of the human excretory system?

Detailed Solution for Excretion In Animals & Plants - 1 - Question 3


The excretory system in humans includes kidneys, ureters, bladder, and urethra.

Excretion In Animals & Plants - 1 - Question 4

Where are the kidneys located in the human body?

Detailed Solution for Excretion In Animals & Plants - 1 - Question 4
  • The kidneys are located in the abdominal cavity, one on either side of the backbone.
  • The kidneys are located in the abdomen, specifically in the upper abdominal cavity, on either side of the spine.
  • They are positioned against the back muscles and typically extend from the T12 to L3 vertebrae.
  • The right kidney is slightly lower than the left kidney due to the position of the liver.
Excretion In Animals & Plants - 1 - Question 5

What is the basic filtration unit in the kidneys called?

Detailed Solution for Excretion In Animals & Plants - 1 - Question 5
  • The nephron is the basic filtration unit in the kidneys.
  • Each kidney contains millions of nephrons, which are responsible for filtering blood and producing urine.
  • The nephron consists of several parts, including the glomerulus, Bowman's capsule, renal tubules, and collecting ducts.
Excretion In Animals & Plants - 1 - Question 6

Which structure collects the filtrate in the kidneys?

Detailed Solution for Excretion In Animals & Plants - 1 - Question 6


Bowman's capsule collects the filtrate from the glomerulus in the kidneys.

Excretion In Animals & Plants - 1 - Question 7

What substances are selectively re-absorbed from the initial filtrate in the kidneys?

Detailed Solution for Excretion In Animals & Plants - 1 - Question 7
  • During the process of urine formation in the kidneys, the initial filtrate from the blood (which includes water, ions, glucose, amino acids, urea, and other substances) passes through the renal tubules.
  • As this filtrate moves along the tubules, various substances are selectively reabsorbed back into the bloodstream to maintain the body's balance of water and solutes.
Excretion In Animals & Plants - 1 - Question 8

Where is urine stored before it is expelled from the body?

Detailed Solution for Excretion In Animals & Plants - 1 - Question 8
  • Urine is stored in the urinary bladder before it is expelled from the body through the urethra.
  • The bladder is a muscular sac located in the pelvis that expands as it fills with urine from the kidneys via the ureters.
Excretion In Animals & Plants - 1 - Question 9

What triggers the urge to pass urine?

Detailed Solution for Excretion In Animals & Plants - 1 - Question 9
  • The urge to pass urine (urination or micturition) is triggered by the expansion of the urinary bladder.
  • As urine accumulates in the bladder, stretch receptors in the bladder wall send signals to the brain, indicating that the bladder is full and needs to be emptied.
  • This sensation of bladder fullness leads to the conscious urge to urinate.
Excretion In Animals & Plants - 1 - Question 10

Which of the following is NOT a method used by plants for excretion?

Detailed Solution for Excretion In Animals & Plants - 1 - Question 10

Plants do not actively transport waste into the atmosphere; they primarily use methods such as transpiration, storage in vacuoles, and shedding of leaves for excretion.

Excretion In Animals & Plants - 1 - Question 11

What is the basic unit of filtration in the kidney that contains a cluster of capillaries?

Detailed Solution for Excretion In Animals & Plants - 1 - Question 11
  • The glomerulus is a network of capillaries within the nephron that performs the initial filtration of blood. It is surrounded by Bowman’s capsule, which collects the filtered urine. The glomerulus plays a crucial role in filtering waste products from the blood.
Excretion In Animals & Plants - 1 - Question 12

Which of the following structures in the kidney is responsible for the initial filtration of blood?

Detailed Solution for Excretion In Animals & Plants - 1 - Question 12
  • Bowman's capsule, also known as the glomerular capsule, is the structure in the kidney responsible for the initial filtration of blood. It is part of the nephron, which is the functional unit of the kidney.
  • The glomerulus, a network of capillaries, is located within Bowman's capsule.
  • Blood flows into the glomerulus under high pressure, and small molecules such as water, ions, glucose, amino acids, and waste products are filtered from the blood into the Bowman's capsule to form the glomerular filtrate.
Excretion In Animals & Plants - 1 - Question 13

What is the primary function of the kidneys in the human excretory system?

Detailed Solution for Excretion In Animals & Plants - 1 - Question 13

The kidneys filter waste products such as urea and uric acid from the blood, which is the primary function of these organs in the excretory system.

Excretion In Animals & Plants - 1 - Question 14

Which of the following components is NOT reabsorbed selectively in the nephron?

Detailed Solution for Excretion In Animals & Plants - 1 - Question 14

Urea is a waste product and is not reabsorbed; instead, it is excreted in the urine. Glucose, amino acids, and salts are selectively reabsorbed.

Excretion In Animals & Plants - 1 - Question 15

How do plants primarily get rid of excess water?

Detailed Solution for Excretion In Animals & Plants - 1 - Question 15
  • Plants primarily get rid of excess water through transpiration.
  • Transpiration is the process by which water evaporates from the surfaces of plant leaves, mainly through small openings called stomata.
  • This loss of water vapor helps plants regulate their internal water balance, cool down, and transport nutrients from the roots to the leaves.
  • Transpiration plays a crucial role in maintaining the plant's health and facilitating the movement of water and minerals throughout the plant.
Excretion In Animals & Plants - 1 - Question 16

Which structure in the human excretory system is responsible for storing urine until it is expelled from the body?

Detailed Solution for Excretion In Animals & Plants - 1 - Question 16

The urinary bladder stores urine until the pressure from the expanded bladder creates the urge to urinate, at which point it is expelled through the urethra.

Excretion In Animals & Plants - 1 - Question 17

In which part of the kidney does the selective reabsorption of substances such as glucose and amino acids occur?

Detailed Solution for Excretion In Animals & Plants - 1 - Question 17
  • Selective reabsorption of substances such as glucose, amino acids, salts, and water occurs in the tubules of the nephron.
  • After the initial filtration of blood in Bowman's capsule (glomerular filtration), the resulting fluid (glomerular filtrate) enters the renal tubules.
  • The proximal convoluted tubule (PCT) is primarily responsible for reabsorbing most of the filtered substances back into the bloodstream.
  • This selective reabsorption process ensures that essential substances are retained in the body while excess waste products and ions are excreted in urine.
Excretion In Animals & Plants - 1 - Question 18

Which of the following statements about plant excretion is FALSE?

Detailed Solution for Excretion In Animals & Plants - 1 - Question 18

Plants do not excrete urea and uric acid. These are nitrogenous wastes primarily excreted by animals. Plants handle waste products through vacuoles, fallen leaves, and excretion into the soil.

Excretion In Animals & Plants - 1 - Question 19

What is the role of the muscular urinary bladder in the excretory system?

Detailed Solution for Excretion In Animals & Plants - 1 - Question 19
  • The muscular urinary bladder plays a crucial role in the excretory system by storing urine temporarily until it can be excreted from the body through the urethra.
  • The bladder expands as it fills with urine, and its muscular walls contract to expel urine during urination (micturition).
Excretion In Animals & Plants - 1 - Question 20

Why is it significant that the kidney’s filtration units, nephrons, are packed close together?

Detailed Solution for Excretion In Animals & Plants - 1 - Question 20

Having nephrons packed close together maximizes the kidney's ability to filter blood efficiently by providing a large surface area for filtration.

Excretion In Animals & Plants - 1 - Question 21

Which organs are part of the human excretory system?

Detailed Solution for Excretion In Animals & Plants - 1 - Question 21

The excretory system in humans includes kidneys, ureters, bladder, and urethra.

Excretion In Animals & Plants - 1 - Question 22

Where are the kidneys located in the human body?

Detailed Solution for Excretion In Animals & Plants - 1 - Question 22

The kidneys are located in the abdominal cavity, one on either side of the backbone.

Excretion In Animals & Plants - 1 - Question 23

What is the basic filtration unit in the kidneys called?

Detailed Solution for Excretion In Animals & Plants - 1 - Question 23
  • The nephron is the basic filtration unit in the kidneys.
  • Each kidney contains millions of nephrons, which are responsible for filtering blood and producing urine.
  • The nephron consists of several parts, including the glomerulus, Bowman's capsule, renal tubules, and collecting ducts.
  • The glomerulus and Bowman's capsule together form the initial filtration unit where blood plasma is filtered into the nephron.
Excretion In Animals & Plants - 1 - Question 24

Which structure collects the filtrate in the kidneys?

Detailed Solution for Excretion In Animals & Plants - 1 - Question 24

Bowman's capsule collects the filtrate from the glomerulus in the kidneys.

Excretion In Animals & Plants - 1 - Question 25

Which waste product mentioned is directly associated with photosynthesis in plants?

Detailed Solution for Excretion In Animals & Plants - 1 - Question 25
  • During photosynthesis in plants, carbon dioxide (CO2) is taken in from the atmosphere, and water (H2O) is absorbed from the soil.
  • In the presence of sunlight and chlorophyll, these raw materials are converted into glucose (C6H12O6) and oxygen (O2).
  • Oxygen is a waste product of photosynthesis and is released into the atmosphere through stomata in plant leaves.
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