Plant Biology and Classification

Ferns and moss are both examples of 'primitive plants'. They have not developed all the specialised systems, that modern plants have, although ferns are more highly developed, than mosses. In mosses, sporophytes lack chlorophyll and depend on photosynthetic gametophyte for food, whereas, in ferns, sporophyte stage has true roots, stem and leaves and does not depend on gametophyte.

Funaria (bryophyte), Dryopteris (pteridophyte), and Ginkgo (gymnosperm) all produce archegonia as their female reproductive organ. They differ significantly in vascular tissue and the independence of their sporophyte/gametophyte generations.

The petiole is the stalk that attaches the leaf blade to the plant stem. It allows the leaf to be positioned to capture sunlight.

Nodes are the specific locations on a stem where leaves, buds, or branches are attached. The space between two nodes is called an internode.

The plant body is divided into two main systems: the root system (below ground) and the shoot system (above ground), which includes stems, leaves, and reproductive structures like flowers.

Biennials are plants that require two growing seasons to complete their life cycle. They typically grow vegetatively in the first year and flower/produce seeds in the second.

A taproot system consists of one primary, thick root that grows deep into the soil, with smaller lateral roots branching off it. This is common in many dicots.

A fibrous root system is characterized by many roots of similar size that spread out near the surface, rather than one dominant central root. This is common in monocots like grasses.

In angiosperms, the ovary matures into a fruit after fertilization, which serves to protect the seeds and aid in their dispersal.

In double fertilization, one sperm cell fertilizes the egg (forming a diploid zygote), while the second sperm cell fuses with two polar nuclei, resulting in a triploid cell that develops into the endosperm.

After a pollen grain lands on the stigma, it germinates and grows a pollen tube down through the style to deliver the sperm cells to the ovary.

Pollination is the transfer of pollen from the anther to the stigma. Fertilization is the subsequent fusion of gametes.

The style is the slender, stalk-like structure that connects the stigma to the ovary, providing a pathway for the pollen tube.

The carpel (or pistil) is the female reproductive structure of a flower, consisting of the stigma, style, and ovary.

Anthers are the specific part of the stamen responsible for producing and releasing pollen grains. Ovaries and ovules are part of the female reproductive system, while filaments are the stalks supporting the anthers.