Classification of Plants Practice Questions

Correct answer: Bryophyta

Bryophytes are called amphibians because they live in soil but depend on water for sexual reproduction. Their male gametes (sperms) require a film of water to swim to the egg.

Correct answer: Thallophyta

Thallophyta includes plants with a thallus-like body that is not differentiated into roots, stems, or leaves. Most organisms in this group are aquatic and are known as algae.

Correct answer: Pteridophyta

Pteridophytes are the first terrestrial plants to possess vascular tissues. This structural adaptation allowed them to grow larger and inhabit more diverse environments than bryophytes.

Correct answer: Naked seeds not enclosed in a fruit

The term Gymnosperm is derived from Greek words meaning 'naked seeds.' Unlike Angiosperms, their ovules are not enclosed by an ovary wall and remain exposed both before and after fertilization.

Correct answer: Floral parts in multiples of three

Monocots are characterized by seeds with a single cotyledon, parallel venation in leaves, and fibrous roots. Their floral parts are typically trimerous (in multiples of three).

Correct answer: Angiosperms

Angiosperms are the flowering plants. Their seeds develop inside the ovary, which matures into a fruit, providing protection and helping in seed dispersal.

Correct answer: Funaria

Funaria is a common moss belonging to the group Bryophyta. Spirogyra is a thallophyte, Marsilea is a pteridophyte, and Pinus is a gymnosperm.

Correct answer: Gymnosperms

Gymnosperms like pines and cedars bear male and female reproductive structures on separate cones. These are clusters of sporophylls that hold the microsporangia or megasporangia.

Correct answer: Cryptogams

Cryptogams (meaning 'hidden marriage') include Thallophyta, Bryophyta, and Pteridophyta. They reproduce via spores and do not produce seeds or flowers.

Correct answer: Ferns

Ferns are the most well-known pteridophytes. They have differentiated plant bodies with roots, stems, and leaves (fronds) and reproduce via spores found in sori on the leaf undersides.

Correct answer: Reticulate venation

Dicots generally exhibit reticulate venation, where veins form a net-like pattern on the leaf blade. This is distinct from the parallel venation seen in monocots like grasses and lilies.

Correct answer: Ginkgo biloba

Ginkgo biloba is often called a living fossil because it is the only surviving member of an ancient order of plants that dates back over 200 million years. Pinus, Cedrus, and Abies are all modern conifers with many living relatives.

Correct answer: Produce seeds

Phanerogams are plants that produce seeds. This group includes Gymnosperms and Angiosperms, where the reproductive process results in a seed containing an embryo and stored food.

Correct answer: Presence of vascular tissues

Both Gymnosperms and Pteridophytes possess vascular tissues (xylem and phloem). However, pteridophytes do not produce seeds, whereas gymnosperms do.

Correct answer: Sphagnum

Sphagnum is a genus of mosses that can hold large amounts of water. It slowly decays into peat, which is used globally as a soil conditioner and fuel.

Correct answer: Angiosperms

In Angiosperms, the diploid sporophyte is the dominant, independent, and photosynthetic phase of the life cycle. The gametophyte is highly reduced and dependent on the sporophyte.

Correct answer: Moss

Mosses (Bryophytes) are non-vascular plants, meaning they lack xylem and phloem. Ferns, Cycas, and Sunflowers are all vascular plants (Tracheophytes).

Correct answer: Prothallus

The prothallus is the gametophyte stage in the life of a fern. It is a small, green, photosynthetic structure that bears the sex organs (antheridia and archegonia).

Correct answer: Phaeophyceae (Brown algae)

Kelps are large brown algae belonging to the class Phaeophyceae. They are found in cool, nutrient-rich marine waters and are some of the fastest-growing organisms on Earth.