Collenchyma tissue is absent in monocots.

Explanation:
Collenchyma tissue is a type of simple permanent tissue that provides mechanical support and elasticity to young plant parts. It is characterized by the presence of thickened cell walls in the corners of the cells. Collenchyma tissue is present in dicots and some monocots, but absent in some other monocots.

Monocots are flowering plants that have only one cotyledon or seed leaf. Examples of monocots include grasses, lilies, and orchids. Unlike dicots, monocots have scattered vascular bundles (bundles of xylem and phloem) in their stems and leaves.

In monocots, the mechanical support is provided by other types of tissues such as:

1. Sclerenchyma tissue: It is a type of simple permanent tissue that provides mechanical support to plant parts. Sclerenchyma cells have thick, lignified cell walls and are dead at maturity. Sclerenchyma tissue is present in both dicots and monocots.

2. Aerenchyma tissue: It is a type of simple tissue that contains large air spaces that help in the exchange of gases. Aerenchyma tissue is present in some monocots such as rice and water hyacinth, but not in all monocots.

3. Chlorenchyma tissue: It is a type of parenchyma tissue that contains chloroplasts and is involved in photosynthesis. Chlorenchyma tissue is present in both dicots and monocots.

Therefore, the correct answer is option C, Collenchyma tissue, which is absent in some monocots.

Collenchyma are living cells that have thickened cells wall due to pecto-cellulose and provide mechanical support to the stem in herbaceous dicots. Roots do not have collenchyma and collenchyma is absent in monocots due to early development of sclerenchyma, which provides the mechanical support.03-Jul-