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Sclereids are spherical, oval or cylindr...

Sclereids are spherical, oval or cylindrical, highly thickened dead cells. These are made up of
a) Parenchyma
b) Collenchyma
c) Sclerenchyma
d) Aerenchyma

A

Parenchyma

B

Collenchyma

C

Sclerenchyma

D

Aerenchyma

Text Solution

AI Generated Solution

The correct Answer is:
To answer the question regarding the composition of sclereids, we can follow these steps: ### Step-by-Step Solution: 1. **Understand the Definition of Sclereids**: Sclereids are specialized cells that are characterized by their shape (spherical, oval, or cylindrical) and their thickened cell walls. They are also dead cells, meaning they do not contain living protoplasm. 2. **Analyze the Options**: - **a) Parenchyma**: These are living cells with thin walls and contain protoplasm and vacuoles. Therefore, this option can be excluded as sclereids are dead cells. - **b) Collenchyma**: These are also living cells, characterized by their elongated shape and medium thickness of cell walls. Like parenchyma, they contain protoplasm and cannot be the answer. - **c) Sclerenchyma**: This type of tissue consists of dead cells with thick walls and no protoplasm. This matches the description of sclereids perfectly. - **d) Aerenchyma**: This tissue contains air-filled spaces and is also made up of living cells. It can be excluded as it does not match the characteristics of sclereids. 3. **Conclusion**: After analyzing all the options, the only type of tissue that fits the description of sclereids (spherical, oval, or cylindrical, highly thickened dead cells) is **sclerenchyma**. ### Final Answer: **c) Sclerenchyma** ---
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Differentiate between Parenchyma, Collenchyma and Sclerenchyma on the basis of their cell wall.

Read the passage and answer the questions that follow: Simple tissues are also known as ground tissues. They include the tissues known as parenchyma, collenchyma, and sclerenchyma. The parenchyma tissue is composed of parenchyma cells, which are found throughout the plant. They are particularly abundant in the stems and roots. The leaf cells that carry out photosynthesis are also parenchyma cells. Unlike many other plant cells, parenchyma cells are alive at maturity and retain the ability to divide. They perform many functions. Some are special ised for photosynthesis, some for storage, and oth ers for secretion and transport. Like parenchyma cells, collenchyma cells are alive at maturity. They differ from parenchyma cells in that they have thick cell walls. The col lenchyma tissue is most often found in the form of strands or cylinders of cells in stems and leaves. The thick cell walls of collenchyma cells provide support to these plant structures. The strands of tissues in celery are collenchyma tissues. Even collenchyma cells retain the ability to divide. Sclerenchyma consists of thick-walled dead cells. It possesses extremely thick secondary walls due to uniform deposition of lignin. It provides mechanical strength. The cells may occur singly or in groups and may be long and fibrous or stony.Stone cells (sclereids) are found in seed coats and some fruits (e.g, pear). What type of tissue accounts for the crunch when you eat celery?

Knowledge Check

  • Which of the following tissues is composed of mainly dead cells? A) Parenchyma B) collenchyma C) Aerenchyma D) Xylem

    A
    Parenchyma
    B
    Collenchyma
    C
    Aerenchyma
    D
    Xylem

  • Assertion: Sclereids are found in fruit walls of nuts, pulp of fruits like guava, pear and sapota and seed coats of legumes. Reason: Sclereids are spherical, oval or cylindrical, highly thickened dead cells with narrow lumen.

    A
    If both assertion and reason are true and reason is the correct explanation of assertion
    B
    if both assertion and reason are true but reason is not the correct explanation of assertion.
    C
    if assertion is true but reason is false.
    D
    if both assertion and reason are false.

  • Assertion: A simple tissue is made of only one type of cells. Reason: Various simple tissues in plants are parenchyma, collenchyma and sclerenchyma.

    A
    If both assertion and reason are true and reason is the correct explanation of assertion
    B
    if both assertion and reason are true but reason is not the correct explanation of assertion.
    C
    if assertion is true but reason is false.
    D
    if both assertion and reason are false.

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    Read the passage and answer the questions that follow: Simple tissues are also known as ground tissues. They include the tissues known as parenchyma, collenchyma, and sclerenchyma. The parenchyma tissue is composed of parenchyma cells, which are found throughout the plant. They are particularly abundant in the stems and roots. The leaf cells that carry out photosynthesis are also parenchyma cells. Unlike many other plant cells, parenchyma cells are alive at maturity and retain the ability to divide. They perform many functions. Some are special ised for photosynthesis, some for storage, and oth ers for secretion and transport. Like parenchyma cells, collenchyma cells are alive at maturity. They differ from parenchyma cells in that they have thick cell walls. The col lenchyma tissue is most often found in the form of strands or cylinders of cells in stems and leaves. The thick cell walls of collenchyma cells provide support to these plant structures. The strands of tissues in celery are collenchyma tissues. Even collenchyma cells retain the ability to divide. Sclerenchyma consists of thick-walled dead cells. It possesses extremely thick secondary walls due to uniform deposition of lignin. It provides mechanical strength. The cells may occur singly or in groups and may be long and fibrous or stony.Stone cells (sclereids) are found in seed coats and some fruits (e.g, pear). Which type of tissue is responsible for the hardness of the coconut shell?

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