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Science Assertion (A) & Reason (B) MCQ

Tissues · Rajasthan Board (RBSE) STD 9 (Rajasthan - English Medium). 5 questions.

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Assertion (A) & Reason (B) MCQ

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Question 11 Mark
In the following Questions, the Assertion and Reason have been put forward. Read the statements carefully and choose the correct alternative from the following:
  1. Both the Assertion and the Reason are correct and the Reason is the correct explanation of the Assertion.
  2. The Assertion and the Reason are correct but the Reason is not the correct explanation of the Assertion.
  3. Assertion is true but the Reason is false.
  4. The statement of the Assertion is false but the Reason is true.
Assertion: Simple tissue is made up of only one type of cell.
Reason: Types of simple tissues in plants are parenchyma, collenchyma and sclerenchyma.
Answer
  1. Both the Assertion and the Reason are correct and the Reason is the correct explanation of the Assertion
Explanation:
Simple tissues are made up of only one type of cells, which look like each other. Parenchyma, collenchyma and sclerenchyma are the examples of simple plant tissue whereas xylem and phloem are complex tissue.
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Question 21 Mark
In the following Questions, the Assertion and Reason have been put forward. Read the statements carefully and choose the correct alternative from the following:
  1. Both the Assertion and the Reason are correct and the Reason is the correct explanation of the Assertion.
  2. The Assertion and the Reason are correct but the Reason is not the correct explanation of the Assertion.
  3. Assertion is true but the Reason is false.
  4. The statement of the Assertion is false but the Reason is true.
Assertion: The cells of connective tissues except blood secret fibre.
Reason: Fibres provide strength, elasticity and flexibility to the tissues.
Answer
  1. Both the Assertion and the Reason are correct and the Reason is the correct explanation of the Assertion
Explanation:
Cells of connective tissue except blood secrete fibres. Fibroblasts are main cells of connective tissue that secrete various types of fibres. There are three types of fibres secreted by connective tissue cells and each type is formed by proteins. These are collagen fibres, elastic fibres and reticular fibres. All provide strength, elasticity and flexibility to connective tissue.
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Question 31 Mark
In each of the following questions, a statement of Assertion is given by the corresponding statement of Reason. Of the statements, mark the correct answer as:
  1. If both Assertion and Reason are true and Reason is the correct explanation of Assertion.
  2. If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
  3. If Assertion is true, but Reason is false.
  4. If Assertion is false, but Reason is true.
  5. If both Assertion and Reason are false.
Assertion: Water hyacinth can float on water surface.
Reason: Aerenchyma tissue is present in water hyacinth.
Answer
  1. If both Assertion and Reason are true and Reason is the correct explanation of Assertion.
Explanation:
Water hyacinth floats on surface of water because the parenchyma tissue present in water hyacinth has specialized tissue modification which is called Aerenchyma. This tissue has large air cavities due to which it provides the buoyancy to the plant and helps to float in the water.
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Question 41 Mark
In each of the following questions, a statement of Assertion is given by the corresponding statement of Reason. Of the statements, mark the correct answer as:
  1. If both Assertion and Reason are true and Reason is the correct explanation of Assertion.
  2. If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
  3. If Assertion is true, but Reason is false.
  4. If Assertion is false, but Reason is true.
  5. If both Assertion and Reason are false.
Assertion: Apical meristem is present at shoot and root tips.
Reason: It helps in the longitudinal growth of plants.
Answer
  1. If both Assertion and Reason are true and Reason is the correct explanation of Assertion.
Explanation:
These meristems are located on the tip of the root, stem etc. They help in the growth of the root system as well as the shoot system. The various cell divisions along with the cellular enlargement help in the growth of the stem above the ground and the growth of the root below the ground.
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Question 51 Mark
In each of the following questions, a statement of Assertion is given by the corresponding statement of Reason. Of the statements, mark the correct answer as:
  1. If both Assertion and Reason are true and Reason is the correct explanation of Assertion.
  2. If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
  3. If Assertion is true, but Reason is false.
  4. If Assertion is false, but Reason is true.
  5. If both Assertion and Reason are false.
Assertion: Heart can pump blood throughout the body.
Reason: It is made up of cardiac muscles.
Answer
  1. If both Assertion and Reason are true and Reason is the correct explanation of Assertion.
Explanation:
Heart can pump blood throughout the body. It is made up of cardiac muscles. Cardiac muscle tissue is only found in the heart. Highly coordinated contractions of cardiac muscle pump blood into the vessels of the circulatory system. Similar to skeletal muscle, cardiac muscle is striated and organized into sarcomeres, possessing the same banding organization as skeletal muscle
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Assertion (A) & Reason (B) MCQ - Science STD 9 Questions - Vidyadip