Chapter 22, Problem 14A

Summary Introduction

Introduction :

Plants have many different tissues with specific function in different parts. They function together to provide food production and storage; give flexibility, support, and strength to the plants. The plant tissue includes meristematic tissue that involve in producing new cells throughout the lives of a plant, dermal tissue that is also considered as epidermis, it forms cuticles that help to reduce loss of water. Trichomes are the epidermal cells that are hairlike and produce in leaves and stems. It gives the leaves and stems a fuzzy appearance to provide protection against predators, it also involved in maintaining the optimal temperature keep it cool. Root hairs are other epidermal cells that found in roots, this involve in the increasing the surface area of roots. The next is the vascular tissue involve in the transportation of nutrients, water, and other substances in plants. All the tissues are found in different parts of plants like roots, stems, and leaves.

Explanation of Solution

The roots are mostly the first structure to form from a seed. It involves in the absorption of minerals and water from the soil for transportation to the other parts of plants. The structure of root composed of root cap that has parenchyma cells for the protection of root tissue during its growth. The root cap has many layers like epidermal layer, then cortex, it is made of ground tissues, it found between the epidermis and vascular tissue of the root. The inner boundary of the cortex is the endodermis; this is a part of cell wall and consists of a waterproof strip termed as casparian strip. The next layer of root cap is pericycle found next to the epidermis towards the center of the root, this tissue is involved in the formation of lateral roots.

Conclusion

The endodermis is found in the inner boundary of the cortex. The pericycle is found next to the endodermis that points towards the center of the root.