Mid Exam: Physiology of Woody Plants

Terrestrial plants are structurally reinforced to support their mass as they grow toward sunlight along the pull of gravity.

• True

• False

Terrestrial plants lose water continuously by evaporation and have evolved mechanisms for avoiding desiccation.

• True

• False

A woody plant is plants with hard, thickened woody stems or a plant having hard lignified tissues or woody parts.

• True

• False

The main stem, larger branches, and roots of woody plants is not covered by a layer of thickened bark.

• True

• False

Woody vines exist in both flowering and non-flowering varieties.

• True

• False

The wood is composed of two materials: lignin and cellulose, which are rigid and provide the support structure for the woody plant.

• True

• False

Branches support the foliage and provide water transport from the roots to the leaves and also transport photosynthates to other locations in the plant.

• True

• False

Stems and branches consist of bark, phloem, cambium and xylem.

• True

• False

Bark is like the skin of human beings, an external protective layer. An inner layer called phloem carries the food produced in the leaves to other parts of the tree where it is utilized.

• True

• False

The cambium is a thin layer between the phloem and the sapwood (xylem). Cells in this layer divide producing phloem to the outside and xylem to the inside. If the phloem and cambium layer is cut all the way around the circumference of a tree, the tree will die due to a lack of food movement.

• True

• False