Tissues- Assertion & Reason Type Questions - Free AR with Solutions

Cells of bark are dead and compactly arranged without intercellular spaces. They have a chemical called suberin in their walls that make them impervious to gasesand water.

Let's analyze the assertion and the reason:

Assertion (A): Vessel and sieve tube both are meant for transport purposes.

• This statement is true. Vessels are involved in the transport of water and minerals in plants (part of the xylem), while sieve tubes are involved in the transport of food (sugars) in plants (part of the phloem).

Reason (R): Vessels are lignified.

• This statement is also true. Vessels are lignified, meaning they have thickened cell walls reinforced with lignin, which provides structural support and helps in the efficient transport of water.

However, the reason (R) given does not directly explain the assertion (A). The fact that vessels are lignified does not explain why both vessels and sieve tubes are meant for transport purposes.

Correct Answer:

2 (Both assertion (A) and reason (R) are true, but reason (R) is not the correct explanation of assertion (A)).

Lateral meristems are present along the side of the stem. Vascular cambium in the gymnosperms and the angiosperms is a good example of lateral meristems. Lateral meristem is always composed of a single layer of rectangular cells that divide only in one plane and produce new vascular tissues on either side.

Assertion: Husk of coconut is made of sclerenchymatous tissue.

Reason: Cells of sclerenchymatous tissue are dead with long and narrow walls thickened due to lignin.

• Both assertion (A) and reason (R) are true.
• Reason (R) explains that the cells are dead and have thickened walls, which supports the assertion.
• Thus, the correct choice is that both statements are true, and reason (R) correctly explains assertion (A).

Meristematic tissues, after differentiation, give rise to permanent tissues. These constitute the major portion of the plant body.

 1 A plant is composed of two main types of tissue: meristematic tissue and permanent tissue. Meristematic tissue consists of actively dividing cells found in root and shoot tips. As growth occurs, meristematic tissue differentiates into permanent tissue, which is categorized as either simple or complex.

 2 Meristematic tissue cells are either undifferentiated or incompletely differentiated, and they continue to divide and contribute to the growth of the plant. ... Such cells take on specific roles and lose their ability to divide further. They differentiate into three main types: dermal, vascular, and ground tissue.