Q30.2-1CC - Campbell Biology

Question

Use examples from Figure 30.7 to describe how various gymnosperms are similar yet distinctive. 

Step-by-Step Solution

Answer

Gymnosperms are similar in that their seeds are not enclosed in ovaries or fruits, but their seed-bearing systems differ significantly. Cycads, for example, have huge cones, whereas certain gymnosperms, like Ginkgo and Gnetum, 

In certain gymnosperm have tiny cones that resemble berries despite not being fruits. Leaf shape varies significantly, from the needles of many conifers to the palm-like leaves of cycads to the flowering plant-like leaves of Gnetum.

Step 1: Gymnosperms plants

Gymnosperms are seed-bearing plants that, unlike angiosperms, generate seeds rather than fruits. These plants generate a cone-like arrangement on the surface of leaves or at the end of stalks.

The ovules are not contained within the ovary wall in these plants. It remains visible after fertilization and before it develops into a seed, for example, conifers, pine, and more.

Step 2: Types of gymnosperms plant

Gymnosperms are divided into four families: Cycadophyta, Ginkophyta, Gnetophyta, and Coniferophyta. Gymnosperms can be found in colder climates, arid regions, and tropical climates.

Gymnosperms are less evolved than angiosperms.

Step 3: Similarities and differences in gymnosperms

Although Gymnosperms have seeds that are not encased in ovaries or fruits, their seed-bearing systems differ substantially. Cones on cycads are enormous, but gymnosperms (Ginkgo) have little cones that resemble berries (but are not).

The form of the leaves varies a lot as well. Conifers have needles, and cycads have palm-like leaves.