Question

The tallest plant is
A)Anthocephalus cadamba
B)Acacia nilotica
C)Eucalyptus regnans
D)Rafflesia arnoldii

Answer 1

In the kingdom of Plantae, plants are multicellular organisms using photosynthesis to make their own food. There are more than 300,000 plant species; grass, trees and shrubs are common examples of plants. Plants play an important role in ecosystems around the world.

Complete answer:
Anthocephalus cadamba

1.Anthocephaluscadamba is a large tree with a broad, straight crown and
2.Bole cylindrical. Tree: can reach a height of 45 m with a diameter of a trunk
100-(160) cm in height. The tree has small buttresses and a large crown at times.
3.The bark is green, smooth in young trees, rough in old trees and fissured longitudinally.
4.Glossy green leaves, opposite, more or less sessile to petiolate, ovate to elliptical, simple

Acacia nilotica
1.The trunk is short, thick (1 m in diameter) and cylindrical, covered with grey bark. Babul (Acacia nilotica) is a medium sized, thorny, almost evergreen tree that can attain a height of 20-25 m but can remain a shrub in poor growing conditions.
2.There may be flattening or rounding of the crown. Growing conditions and subspecies depend on the root system: a deep taproot in dry conditions and extensive lateral roots in flooded conditions.
3.With 7 to 36 pairs of elliptical, grey-green, hairy leaflets, the leaves are 5-15 cm long and alternate and compound. The flowers are sweetly fragrant in colour and light to golden yellow.

Eucalyptus regnans
1.Eucalypti are rapidly growing, and several species exceed high altitudes. Victoria and Tasmania's giant gum tree, or mountain ash (Eucalyptus regnans), is one of the largest trees, reaching a height of approximately 90 metres (300 feet) and a diameter of 7.5 metres (24.5 feet).
2.In flakes or ribbons, many species constantly shed the dead outermost layer of bark, while some other species have dense textured bark.
3.The leaves are leathery and hang obliquely or vertically frequently; most species are evergreen.
4.When the flower spreads, the flower petals cohere in order to form a cap. A woody cup-shaped receptacle surrounds the capsule fruit and includes various minute seeds.
5.The largest fruits are possibly borne by mottlecah, or silverleaf eucalyptus, from 5 to 6 cm (2 to 2.5 inches in diameter (E. macrocarpa).

Rafflesia arnoldii
1.In the parasitic genus Rafflesia, Rafflesia arnoldii is a species of flowering plant. It is known for growing the largest individual flower on Earth.
2.The Rafflesia arnoldii is the flower with the largest bloom in the world. In the rainforests of Indonesia, this uncommon flower is found.
3.It can grow up to 3 feet wide and up to 15 pounds in weight! It is a parasitic plant, with no leaves, roots, or stems visible.

Hence, the correct answer is option (C)

Note: Eucalyptus regnans is prized for its wood, and has been harvested in very large quantities. Saw Logging and wood chipping are primary uses. In the 20th century, it was a big source of newspapers. Forests of Regnans are especially vulnerable to bushfire devastation and to a lesser degree, timber harvesting.