Assertion and Reason: Getting to Know Plants | Class 6: Additional Practice PDF Download

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The questions below consists of an assertion and a Reason. Use the key to choose the appropriate answer.

Q1: Assertion: There are two types of roots tap root and fibrous
Reason: Roots absorb water and minerals from the soil
(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 correct in stating that there are two main types of roots: taproot and fibrous. The reason is also correct because one of the primary functions of roots is to absorb water and minerals from the soil. Taproots and fibrous roots have different structures and perform this function in slightly different ways, making the reason a valid explanation for the assertion.

Q2: Assertion: The Parts of a flower are sepats, petals statements and pistil.
Reason: The stem bears petiole and lamina.
(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 correct in listing the parts of a flower. However, the reason is incorrect because it mentions the stem bearing petiole and lamina, which are actually parts of a leaf, not a flower. This makes the reason an inaccurate explanation for the assertion.

Q3: Assertion: Plants are usually qrouped into herbs, shrubs and trees
Reason: The plants are classified on the basis of their height, nature, of stem and branches
(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)
Both the assertion and the reason are correct. Plants are indeed grouped into categories like herbs, shrubs, and trees based on characteristics such as their height, the nature of their stems, and their branching patterns. The reason effectively explains why plants are classified in this manner.

Q4: Assertion: Green leaves make their food by the process of photosynthesis.
Reason: Plants used Co2 And water in the presence of sunlight make their food.
(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)
Both the assertion and the reason are correct. Green leaves make their food through the process of photosynthesis, where they use carbon dioxide (CO2), water, and sunlight to produce glucose and oxygen. The reason accurately explains how this process works and supports the assertion.

Q5: Assertion: All green plants synthesize their food by photosynthesis.
Reason: Green plants have chlorophyll that helps in 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: (a)
The green color of plants is due to the presence of chlorophyll, a pigment that absorbs light energy for photosynthesis. Therefore, all green plants synthesize their food by photosynthesis.

Q6: Assertion: The stem transports water and minerals from the roots to the leaves.
Reason: The stem contains xylem vessels that transport water and minerals.
(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 stem contains xylem, a type of transport tissue in vascular plants that provides support and conducts water and nutrients from the roots to the rest of the plant.

Q7: Assertion: Herbs have a short lifespan.
Reason: Herbs have a soft and green stem.
(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)
While it is true that herbs generally have a shorter lifespan compared to trees and shrubs, it is not because they have a soft and green stem. Their lifespan is determined by their genetic makeup and environmental factors, not their physical characteristics.

Q8: Assertion: Climbers need support to grow.
Reason: Climbers have weak stem.
(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)
Climbers are plants whose stems are weak and cannot stand upright, hence they need support to grow.

Q9: Assertion: The leaves are the food factories of the plant.
Reason: Photosynthesis takes place in the leaves.
(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)
Photosynthesis, the process by which green plants prepare their food, mainly occurs in the leaves. Hence, leaves are often referred to as the food factories of the plant.