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Grade 11 Exam  >  Grade 11 Test  >  Biology  >  Assertion & Reason Test: Morphology of Flowering Plants - Grade 11 MCQ

Morphology of Flowering Plants - Free Assertion & Reason Questions


MCQ Practice Test & Solutions: Assertion & Reason Test: Morphology of Flowering Plants (12 Questions)

You can prepare effectively for Grade 11 Biology for Grade 11 with this dedicated MCQ Practice Test (available with solutions) on the important topic of "Assertion & Reason Test: Morphology of Flowering Plants". These 12 questions have been designed by the experts with the latest curriculum of Grade 11 2026, to help you master the concept.

Test Highlights:

  • - Format: Multiple Choice Questions (MCQ)
  • - Duration: 20 minutes
  • - Number of Questions: 12

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Assertion & Reason Test: Morphology of Flowering Plants - Question 1
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Directions : In the following question, the Assertions (A) and Reason (R) have been put forward. Read both the statements and choose the correct option from the following.

Assertion : Pea has vexillary type of aestivation.

Reason : In this type of aestivation, the posterior petal is the largest and covers almost the two lateral petals, and the latter in their turn, nearly overlap the two anterior or smallest petals.

Detailed Solution: Question 1

In vexillary type of aestivation, the posterior petal is the largest and covers almost the two lateral petals, and the latter in their turn, nearly overlap the two anterior or smallest petals. e.g, pea. This type of gestational is also called as descending imbricate aestivation.

Topic in NCERT: Aestivation

Line in NCERT: "In pea and bean flowers, there are five petals, the largest (standard) overlaps the two lateral petals (wings) which in turn overlap the two smallest anterior petals (keel); this type of aestivation is known as vexillary or papilionaceous."

Assertion & Reason Test: Morphology of Flowering Plants - Question 2
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Directions : In the following question, the Assertions (A) and Reason (R) have been put forward. Read both the statements and choose the correct option from the following.

Assertion : Pea has vexillary type of aestivation.

Reason : In this type of aestivation, the posterior petal is the largest and covers almost the two lateral petals, and the latter in their turn, nearly overlap the two anterior or smallest petals.

Detailed Solution: Question 2

In vexillary type of aestivation, the posterior petal is the largest and covers almost the two lateral petals, and the latter in their turn, nearly overlap the two anterior or smallest petals. e.g, pea. This type of gestational is also called as descending imbricate aestivation.

Topic in NCERT: Aestivation

Line in NCERT: "In pea and bean flowers, there are five petals, the largest (standard) overlaps the two lateral petals (wings) which in turn overlap the two smallest anterior petals (keel); this type of aestivation is known as vexillary or papilionaceous."

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Assertion & Reason Test: Morphology of Flowering Plants - Question 3
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Directions : In the following question, the Assertions (A) and Reason (R) have been put forward. Read both the statements and choose the correct option from the following.

Assertion : In perigynous flowers is ovary is called half-inferior.

Reason : Rose and plum plants bear perigynous flowers.

Detailed Solution: Question 3

In perigynous flowers , ovary is situated at the centre and other parts are on the rim of the thalamus hence, ovary is called half-inferior.

Topic in NCERT: Position of floral parts on thalamus

Line in NCERT: "The ovary here is said to be half inferior, e.g., plum, rose, peach."

Assertion & Reason Test: Morphology of Flowering Plants - Question 4
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Assertion (A): In monocotyledonous plants, the primary root is short-lived and is replaced by a large number of roots originating from the base of the stem.

Reason (R): Monocotyledonous plants have a fibrous root system that helps in providing a more extensive network for water and nutrient absorption.

Detailed Solution: Question 4

The assertion is true as in monocotyledonous plants, the primary root is indeed short-lived and is replaced by a fibrous root system originating from the base of the stem. The reason is also true and correctly explains the assertion because the fibrous root system provides a more extensive network for efficient water and nutrient absorption from the soil.

Topic in NCERT: THE ROOT

Line in NCERT: "In monocotyledonous plants, the primary root is short lived and is replaced by a large number of roots. These roots originate from the base of the stem and constitute the fibrous root system, as seen in the wheat plant."

Assertion & Reason Test: Morphology of Flowering Plants - Question 5
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Assertion :In imbricate aestivation, out of five petals, one is completely internal. One is completely external and in each of the remaining three petals, one margin is internal and the other is external.

Reason: Ascending imbricate aestivation is found in Cassia and gulmohar.

Detailed Solution: Question 5

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
In imbricate aestivation one petal is completely inward, one petal is completely outward, one margin is internal and another margin is external.
Examples of ascending imbricate is Cassia and gulmohar not the reason.
So, the correct answer is B.
 

Topic in NCERT: Aestivation

Line in NCERT: "In Cassia and gulmohur, the aestivation is called imbricate."

Assertion & Reason Test: Morphology of Flowering Plants - Question 6
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Read the assertion and reason carefully to mark the correct option in question.

Assertion: Datura, mustard and chilli shows actinomorphic/bilateral symmetry.

Reason: These flowers can be divided into two similar halves only in one particular vertical plane.

Detailed Solution: Question 6

Actinomorphic flowers are those flowers which can be divided into two equal halves along any plane of symmetry passing through the central axis. These flowers show radial symmetry, and not bilateral symmetry. For example, Datura, mustard and chilli.
Those flowers which can be divided into two equal halves (right and left) only along a single plane of symmetry passing through the central axis are known as zygomorphic flowers. For example, Cassia and gulmohur.
Hence, both assertion and reason statements are incorrect.
The correct option is C If both assertion and reason are false.

Topic in NCERT: THE FLOWER

Line in NCERT: "When a flower can be divided into two similar halves only in one particular vertical plane, it is zygomorphic."

Assertion & Reason Test: Morphology of Flowering Plants - Question 7
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Assertion (A): In some plants, roots are modified to perform functions other than absorption and conduction of water and minerals.
Reason (R): Modification of roots includes changes in shape and structure to store food, provide support, and help in respiration.

Detailed Solution: Question 7

The assertion is true as roots in some plants are indeed modified to perform additional functions beyond their primary roles of absorption and conduction. The reason accurately explains the assertion by listing examples of such modifications, including storage of food (e.g., in carrots), providing support (e.g., prop roots in banyan trees), and aiding in respiration (e.g., pneumatophores in mangroves).

Topic in NCERT: MODIFIED ROOTS IN PLANTS

Line in NCERT: "The roots in some plants get modified for storage of food, mechanical support and respiration."

Assertion & Reason Test: Morphology of Flowering Plants - Question 8
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Directions : In the following question, the Assertions (A) and Reason (R) have been put forward. Read both the statements and choose the correct option from the following.

Assertion : In perigynous flowers is ovary is called half-inferior.

Reason : Rose and plum plants bear perigynous flowers.

Detailed Solution: Question 8

In perigynous flowers , ovary is situated at the centre and other parts are on the rim of the thalamus hence, ovary is called half-inferior.

Topic in NCERT: Position of floral parts on thalamus

Line in NCERT: "The ovary here is said to be half inferior, e.g., plum, rose, peach."

Assertion & Reason Test: Morphology of Flowering Plants - Question 9
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Assertion (A): In monocotyledonous plants, the primary root is short-lived and is replaced by a large number of roots originating from the base of the stem.

Reason (R): Monocotyledonous plants have a fibrous root system that helps in providing a more extensive network for water and nutrient absorption.

Detailed Solution: Question 9

The assertion is true as in monocotyledonous plants, the primary root is indeed short-lived and is replaced by a fibrous root system originating from the base of the stem. The reason is also true and correctly explains the assertion because the fibrous root system provides a more extensive network for efficient water and nutrient absorption from the soil.

Topic in NCERT: THE ROOT

Line in NCERT: "In monocotyledonous plants, the primary root is short lived and is replaced by a large number of roots. These roots originate from the base of the stem and constitute the fibrous root system, as seen in the wheat plant."

Assertion & Reason Test: Morphology of Flowering Plants - Question 10
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Assertion :In imbricate aestivation, out of five petals, one is completely internal. One is completely external and in each of the remaining three petals, one margin is internal and the other is external.

Reason: Ascending imbricate aestivation is found in Cassia and gulmohar.

Detailed Solution: Question 10

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
In imbricate aestivation one petal is completely inward, one petal is completely outward, one margin is internal and another margin is external.
Examples of ascending imbricate is Cassia and gulmohar not the reason.
So, the correct answer is B.
 

Topic in NCERT: Aestivation

Line in NCERT: "In Cassia and gulmohur, the aestivation is called imbricate."

Assertion & Reason Test: Morphology of Flowering Plants - Question 11
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Read the assertion and reason carefully to mark the correct option in question.

Assertion: Datura, mustard and chilli shows actinomorphic/bilateral symmetry.

Reason: These flowers can be divided into two similar halves only in one particular vertical plane.

Detailed Solution: Question 11

Actinomorphic flowers are those flowers which can be divided into two equal halves along any plane of symmetry passing through the central axis. These flowers show radial symmetry, and not bilateral symmetry. For example, Datura, mustard and chilli.
Those flowers which can be divided into two equal halves (right and left) only along a single plane of symmetry passing through the central axis are known as zygomorphic flowers. For example, Cassia and gulmohur.
Hence, both assertion and reason statements are incorrect.
The correct option is C If both assertion and reason are false.

Topic in NCERT: THE FLOWER

Line in NCERT: "When a flower can be divided into two similar halves only in one particular vertical plane, it is zygomorphic."

Assertion & Reason Test: Morphology of Flowering Plants - Question 12
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Assertion (A): In some plants, roots are modified to perform functions other than absorption and conduction of water and minerals.
Reason (R): Modification of roots includes changes in shape and structure to store food, provide support, and help in respiration.

Detailed Solution: Question 12

The assertion is true as roots in some plants are indeed modified to perform additional functions beyond their primary roles of absorption and conduction. The reason accurately explains the assertion by listing examples of such modifications, including storage of food (e.g., in carrots), providing support (e.g., prop roots in banyan trees), and aiding in respiration (e.g., pneumatophores in mangroves).

Topic in NCERT: MODIFIED ROOTS IN PLANTS

Line in NCERT: "The roots in some plants get modified for storage of food, mechanical support and respiration."

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About this Grade 11 Practice Test

This test contains 12 MCQs on Assertion & Reason Test: Morphology of Flowering Plants with detailed solutions for each question. It is part of the Biology for Grade 11 course on EduRev, designed to align with the current Grade 11 syllabus. Each solution explains not just the correct answer but also gives you an understanding of the topic — not just to attempt the question but also help you prepare for the exam with practice.

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