With reference to 'Phloem', consider the following statements: 1. It is made up of tracheids, vessels, and xylem parenchyma. 2. Phloem fibres are the only dead cells in the phloem tissue. 3. Sieve tubes are tubular cells with perforated walls. Which of the statements given above is/are correct?

The correct option is (c). Explanation Phloem is a complex permanent tissue in vascular plants responsible for the translocation of organic nutrients (food), particularly sucrose, from the leaves to other parts of the plant. Unlike xylem, which conducts water and minerals, phloem transports food materials usually in both directions (bidirectional flow). Statement-wise Analysis - Statement 1 is Incorrect. Phloem is composed of four main types of elements: sieve tube elements, companion cells, phloem parenchyma, and phloem fibres. Tracheids, vessels, and xylem parenchyma are components of Xylem tissue, not Phloem. - Statement 2 is Correct. Among the four elements of phloem, sieve tube elements, companion cells, and phloem parenchyma are living cells. Phloem fibres (also known as bast fibres) are sclerenchymatous cells and are the only dead cells in the phloem tissue at maturity. They provide mechanical support. - Statement 3 is Correct. Sieve tubes are long, tubular conducting channels formed by end-to-end fusion of sieve tube elements. Their end walls are perforated in a sieve-like manner to form sieve plates, which allow the passage of food materials. Key Takeaway Phloem consists of sieve tubes, companion cells, phloem parenchyma (all living), and phloem fibres (dead). Xylem consists of tracheids, vessels, xylem fibres (all dead), and xylem parenchyma (living).

With reference to 'Phloem', consider the… - NCERT Class 9 Science MCQ

NCERT Class 9 Science — Chapter 2: Tissues

mcqhard

With reference to 'Phloem', consider the following statements:

It is made up of tracheids, vessels, and xylem parenchyma.
Phloem fibres are the only dead cells in the phloem tissue.
Sieve tubes are tubular cells with perforated walls.

Which of the statements given above is/are correct?

NCERT textbook question

From NCERT Science - class 9 · Page 64

Options

A1 and 2 only
B2 only
C2 and 3 only
D1, 2 and 3

Did you get this right?

Solution

The correct option is (c).

Explanation

Phloem is a complex permanent tissue in vascular plants responsible for the translocation of organic nutrients (food), particularly sucrose, from the leaves to other parts of the plant. Unlike xylem, which conducts water and minerals, phloem transports food materials usually in both directions (bidirectional flow).

Statement-wise Analysis

Statement 1 is Incorrect. Phloem is composed of four main types of elements: sieve tube elements, companion cells, phloem parenchyma, and phloem fibres. Tracheids, vessels, and xylem parenchyma are components of Xylem tissue, not Phloem.
Statement 2 is Correct. Among the four elements of phloem, sieve tube elements, companion cells, and phloem parenchyma are living cells. Phloem fibres (also known as bast fibres) are sclerenchymatous cells and are the only dead cells in the phloem tissue at maturity. They provide mechanical support.
Statement 3 is Correct. Sieve tubes are long, tubular conducting channels formed by end-to-end fusion of sieve tube elements. Their end walls are perforated in a sieve-like manner to form sieve plates, which allow the passage of food materials.

Key Takeaway

Phloem consists of sieve tubes, companion cells, phloem parenchyma (all living), and phloem fibres (dead). Xylem consists of tracheids, vessels, xylem fibres (all dead), and xylem parenchyma (living).

Your note

More from Chapter 2: Tissues

Consider the following statements regarding 'Complex Permanent Tissues': 1. They are made of more than one type of cell. 2. Each cell in the tissue functions independently without coordination. 3. Xylem and Phloem are examples of complex tissues. Which of the statements given above is/are correct?

medium

Consider the following statements about epithelial tissue: 1. It forms a barrier to keep different body systems separate. 2. It is directly connected to the underlying tissue without any separating membrane. 3. It contains large intercellular spaces to facilitate the movement of materials. Which of the statements given above is/are correct?

medium

Consider the following statements about 'Smooth Muscles': 1. They are also known as striated muscles. 2. They control involuntary movements like the movement of food in the alimentary canal. 3. They are multinucleate. Which of the statements given above are correct?

medium

With reference to the fundamental differences between plants and animals, consider the following statements: 1. Plants have a large quantity of supportive tissue which generally consists of dead cells. 2. Growth in plants is uniform throughout the body, whereas in animals it is limited to specific regions. 3. Animals consume more energy compared to plants due to active locomotion. Which of the statements given above is/are correct?

medium

Which one of the following is the most appropriate reason for the skin being made of 'Stratified Squamous Epithelium'?

easy

Keep practising Chapter 2: Tissues

Work through every question from this NCERT chapter.

Browse all NCERT Class 9 Science chapters