Assertion and Reason: The Living Organisms - Characteristics & Habitats | Class 6: Additional Practice PDF Download

The questions below consists of an assertion and a Reason. Use the key to choose the appropriate answer.
Q1: Assertion (A): The place where organisms live is called habitat
Reason (R): The plants and animals that live on land are said to live in terrestrial habitats.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true. 
Ans: (b)
Both the assertion and the reason are correct statements. Organisms live in specific environments known as habitats. In this case, terrestrial habitats refer to habitats on land. However, the reason provided does not accurately explain why the assertion is true. While it's correct that plants and animals on land live in terrestrial habitats, this doesn't explain the general concept of a habitat. The reason should explain the relationship between the assertion and the reason, which it fails to do.

Q2: Assertion (A): Living things produce more of their own kind through reproduction
Reason (R): Only animals reproduce their own kind plants can not reproduce
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true. 
Ans: (c)
The assertion is a correct statement. Living things reproduce to create offspring of their own kind. However, the reason is incorrect. Plants do reproduce, and they do so by various methods, including seed production, spore formation, and vegetative propagation. The reason incorrectly claims that plants cannot reproduce, which contradicts biological understanding. As a result, the reason is not a correct explanation for the assertion.

Q3: Assertion (A): Plants use Co₂ to produce food and give out oxygen.
Reason (R): The amount of oxygen released in the process of food preparation by plants is much more than the oxygen they use in respiration.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true. 
Ans: (b)
Both the assertion and the reason are correct statements. Plants use carbon dioxide (CO₂) during photosynthesis to produce glucose (food) and release oxygen (O₂) as a byproduct. The reason provided is also correct; during photosynthesis, the amount of oxygen released is generally higher than the amount of oxygen used during respiration. However, the reason doesn't directly explain the assertion; it's more of a complementary fact rather than a cause-and-effect explanation.

Q4: Assertion (A): The plants animals micro-organism together constitute biotic components
Reason (R): Rocks, soil, air, H₂O, light and temperature are some of our surrounding
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true. 
Ans: (b)
Both the assertion and the reason are correct statements. Biotic components include all living organisms, such as plants, animals, and micro-organisms, within an ecosystem. The abiotic components (rocks, soil, air, water, light, temperature) are the non-living factors that interact with biotic components. However, the reason provided does not correctly explain why plants, animals, and micro-organisms constitute biotic components. It simply lists some examples of abiotic components without directly explaining their relationship to the assertion.

Q5: Assertion (A): Respiration is necessary for animals.
Reason (R): Fish used their gills of absorb oxygen from the air dissolved in H₂O
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true. 
Ans: (d)
The assertion is a correct statement. Respiration is indeed necessary for animals as it's the process by which they obtain energy from food. However, the reason is incorrect. Fish do use their gills to absorb oxygen from water, not from the air dissolved in water. Fish extract dissolved oxygen from water to support their respiratory needs. Since the reason is incorrect, it cannot be considered a correct explanation for the assertion.

Q6: Assertion (A): Plants can make their own food.
Reason (R): Plants are autotrophs.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
Ans: (a)
The assertion is true as plants can prepare their own food by the process of photosynthesis. The reason is also true because plants are autotrophs, organisms that can produce their own food from light, water, CO₂, etc.

Q7: Assertion (A): Animals living in polar regions have thick fur and a layer of fat under their skin.
Reason (R): This helps them to resist the extremely low temperatures.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true. 
Ans: (a)
Animals living in cold climates have adapted to the temperature by developing thick fur and a layer of fat under their skin. This helps them to insulate their body and maintain their body temperature, protecting them from the extreme cold.

Q8: Assertion (A): All plants respire.
Reason (R): Respiration is necessary for survival.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
Ans: (a)
All living organisms, including plants, respire. Respiration is an essential process where the food is oxidised to release energy. Plants respire for their survival.

Q9: Assertion (A): Fungi are autotrophic organisms.
Reason (R): Fungi perform photosynthesis.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
Ans: (d)
The assertion is incorrect because fungi are not autotrophic, they are heterotrophic organisms. They depend on other organisms for their food. The reason is also false because fungi do not perform photosynthesis; it is the plants that perform photosynthesis.

Q10: Assertion (A): All animals move from one place to another in search of food.
Reason (R): Movement is a characteristic feature of living organisms.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
Ans: (b)
The assertion is true as most animals move from one place to another in search of food. However, the reason is not the correct explanation for the assertion as not all living organisms move from place to place. Some plants and microorganisms do not show movement. Movement is a characteristic feature of most, but not all, living organisms.