Chapter 22, Problem 13A

(a)

Summary Introduction

To write:

The characteristics of the plant dermal tissue that make it efficient than the human skin.

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 include meristematic tissue that involve in producing new cells throughout the lives of a plant, dermal tissue that is also considered as epidermis, it form cuticles that help to reduce loss of water. There is one more tissue found in plants that are ground tissues. They include the tissues that are neither vascular nor dermal. They involve in the storage of carbohydrates of the plants. They are divided into three categories that are parenchyma, collenchyma and sclerenchyma.

Explanation of Solution

Our skin is composed of multilayer while the dermal tissue is composed of single layer. The skin of humans have immunological functions they perform homeostasis while the dermal cell of plants produce cuticles that involve in the prevention of transpiration, in other words to provide protection to the plants. The dermal cell of plants have simple structure they resembles as pieces of jigsaw puzzle that interlock the dips and ridge while the human skin have a very complex structure composed of collagen, elastic tissue, and many other extracellular components.

Conclusion

The plant dermal tissue have monolayer that make a simple structure to study in comparison to the human skin.

(b)

Summary Introduction

To write:

The characteristics of human skin that make it more efficient then dermal cell of plant.

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 include meristematic tissue that involve in producing new cells throughout the lives of a plant, dermal tissue that is also considered as epidermis, it form cuticles that help to reduce loss of water. There is one more tissue found in plants that are ground tissues. They include the tissues that are neither vascular nor dermal. In case of human skin they have multi-layers and divided into papillary region and reticular region. They protect the body from stress and strain, provide elasticity to the skin, and produce a sense of heat and touch.

Explanation of Solution

The human skin perform homeostasis that is involved in providing protection to the body from environmental pathogens, maintain the temperature of the body, etc. while the plant dermis produce cuticles that protect them from water loss and prevent transpiration. As the dermal cell of plants is single layer it can get damaged easily in comparison to the human skin that repairs itself faster. The human skin have papillary and a reticular region that cushion the body from strain and stress and also provide elasticity to the skin.

Conclusion

The human skin is multicellular and performs homeostasis to protect the body from the environmental stress and pathogens.