Plant Classification — Set 3

Correct Answer: D. Peat moss

Sphagnum is known as peat moss because it accumulates over time to form a fossil fuel called peat. It has an incredible capacity to hold water and is used in gardening to keep soil moist. It also has antiseptic properties and was used in ancient times for dressing wounds.

Correct Answer: A. Reproduction by spores

Pteridophytes do not produce flowers or seeds and instead use spores for reproduction. These spores are often found in structures called sori on the underside of their leaves. This makes them distinct from gymnosperms and angiosperms.

Correct Answer: B. Gymnosperms

Gymnosperms are often called conifers because they produce reproductive structures known as cones. These cones carry the ovules or pollen necessary for reproduction. Conifers like pine and spruce are dominant in northern forest biomes.

Correct Answer: B. Brown Algae

Laminaria and Sargassum are brown algae, which are primarily marine Thallophytes. They are often large and complex, forming underwater 'forests' known as kelp beds. They are rich sources of iodine and minerals.

Correct Answer: D. Binomial nomenclature

Binomial nomenclature was introduced by Carolus Linnaeus to provide a unique scientific name for every organism. The name consists of a genus and a specific epithet, usually in Latin. This standardized system helps scientists across the world communicate clearly.

Correct Answer: C. Vascular bundle

Bryophytes are non-vascular plants, meaning they lack vascular bundles consisting of xylem and phloem. They use root-like structures called rhizoids for attachment and water absorption. They are generally small and grow in moist, shady places.

Correct Answer: B. Angiosperms

Angiosperms are considered the most advanced group because they possess highly efficient vascular systems and flowers. Flowers allow for specialized pollination methods involving insects and animals. This complexity has allowed them to colonize almost every habitat on Earth.

Correct Answer: D. Gymnosperms

Gymnosperms are seed-producing plants, but their seeds are 'naked' or exposed on the scales of cones. Unlike angiosperms, they do not have ovaries to develop into fruits. They were the dominant land plants during the Mesozoic era.

Correct Answer: D. Cellulose

Cellulose is a complex carbohydrate that provides structural rigidity and strength to the plant cell wall. It is the most abundant organic polymer on Earth. This wall allows plants to maintain their shape and withstand osmotic pressure.

Correct Answer: D. Sporangium

The correct answer is 'Sporangium'. Sporangia are the specialized structures where spores are produced through meiosis. In many ferns, these are grouped together in clusters called sori on the underside of leaves. Spores are released into the wind to grow into new gametophytes.