Question

12:

a. A wooded area contains mosses, ferns, gymnosperms and angiosperms. A species of bee is the major pollinating insect in this area. Which type of plant is most likely to be negatively affected if this species of bee becomes extinct? are there any types of plants not going to be affected? Explain.

b. What organisms use spores as part of their reproduction cycles? How are these different types of spores alike and how do they differ?

Answer 1

A. Angiosperms plants are most negatively affected if the specious become extinct

The reason behind is:

1. In angiosperms polinatpollis defined as the placement or trnasftr of pollen to another to the stigma of the same flower or another flower.

-they do pollination in two ways:

Self pollination and cross polination.

Cross polination happen through any bees of butterflies.

Thus, if bees extinct, no cross polination occurs. This results in self polination.

-Self polination leads to the production of plants with less genetic diversity.

-because, in contrast cross-pollination happen that leads to greater genetic diversity

Because the microgametophyte and megagametophyte are derived from different plants.

Here, in this case, the production of plants will be with less genetic diversity.

The other reasons are follows:

1. Other plants such as Mosses and ferns reproduce busonflg spores and pollinated

2. But in the case of gymnosperm, pollination involves pollen transfer from the male come to the female cone.

All gymnosperm s are wind pollinated.

B. Organisms use spores as part of their reproduction cycles are Mosses and Ferns.

Similarities:

-Mosses and Ferns have botanical similarities

-both are plants produce spores instead of seeds

Difference s

-Mosses are small pore producing non vascular plants.

-Ferns are spore producing vascular plants.

-The sporophytes of Ferns is differentiated in to true leaves, stem and roots.

In contrast, Mosses lack true leaves, stem or roots