Differentiation of stems and leaves without roots

Make oxygen

There are stems and leaves, no root differentiation, and no conductive tissue.

1.Conservation of water and soil 2.As an indicator plant for monitoring air pollution

It not only has real roots, stems, and leaves, but also has conductive tissue in the body, so it can better adapt to life on land.

Coal (ancient fern)

Seeds are naked and not covered by pericarp

The seeds are coated with pericarp

Roots, stems, leaves, flowers, fruits, seeds

① Tissue differentiation begins to appear ② Has simple organs

The body is flat and the digestive tract has an opening but no anus.

The body is mostly slender, linear, unsegmented, and has a mouth and anus in the digestive tract.

The body consists of many similar shapes from front to back

The body is covered with hard shells to protect the soft body

The body is segmented, with a hard exoskeleton (to prevent evaporation of body water) and segmented appendages.

The body is divided into three parts: head, trunk and tail; the body is streamlined and covered with scales. The lateral lines on both sides of the body can sense the direction of water gill flow.

Larvae live in water, most adults live on land, and their skin assists in breathing.

The body surface is usually covered with scales or armor, and eggs are laid on land. The surface of the eggs has a hard shell.

The body is mostly streamlined, the forelimbs turn into wings, the body surface is covered with feathers, and the body temperature is constant

The whole body is covered with hair, the body temperature is constant, the brain is developed, viviparous and lactating

Parasitic or saprophytic (heterotrophic)

Saprophytic or parasitic (heterotrophic)

parasitic