Plant Biology and Classification

Gossypium hirsutum is the scientific botanical name for upland cotton, which is the most widely cultivated species of cotton globally. The genus name comes from the Latin word for cotton, and 'hirsutum' means hairy, referring to the plant's characteristics.

A scotophyte (from Greek 'skotos' meaning darkness) is a plant that can grow or survive in dark conditions. These plants have adaptations that allow them to thrive with minimal or no light, such as enhanced chlorophyll sensitivity or alternative energy-gathering mechanisms.

Humbodtia decurrens Bedd is a very rare endemic tree of Southern Western Ghats (India).

Xerophytes are plants adapted to survive in dry, arid conditions with minimal water. They have adaptations like reduced leaves, thick cuticles, and water storage tissues. Cacti and succulents are classic examples. Hydrophytes grow in water, and Thallophyte (misspelled as Thellophyte) refers to simpler plant-like organisms.

Hydrophytes are plants adapted to live in aquatic environments. Lotus and water lily grow in water with specialized adaptations like air chambers and reduced root systems.

This is the correct option. Moss follows the growth of lichens on barren rocks.

Cladodes are stem branches of limited growth with single inter-node, whereas the phylloclades have nodes and inter-nodes.

Orobanche (broomrape), Striga (witchweed), and Cuscuta (dodder) are well-known angiospermic parasites. Orobanche and Striga are root parasites, while Cuscuta is a stem parasite. Rafflesia is also a parasite but less common. The other options mix correct and incorrect plant names.

Hydathodes are specialized pores that secrete water droplets (guttation) and are most commonly found in hygrophytes - plants adapted to moist environments where high humidity reduces transpiration. They help remove excess water.

Epiphytic plants like mosses and members of Bromeliaceae grow on other plants and can accumulate significant biomass. When saturated with rainwater, their weight increases substantially, potentially causing young, slender twigs to break under the load.

The terms ‘Class’ and ‘Order’ were given by Linnaeus.

Gelidium is a genus of red algae with a very wide geographic range. Batrachospermum is a genus of freshwater red algae.

Rhodochytrium spilanthidis is found as a parasite on ambrosia leaves. It destroys phloem of the host.

Odonthalia corymbifera is a rich source of bromine. It is about 6% of dry weight.

Genus Ulva is referred to as sea lettuce. It has very long blades and is used in food.