Question

: In Bougainvillea, thorns are the modifications of
A. Leaf
B. Stipules
C. Adventitious root
D. Stem

Answer 1

Hint: The part of the plant that gives support to the plants and transport nutrients from one part of the plant to the other. They are grown from the stem of the plant and give mechanical strength to the plant to stand in all conditions.

Complete answer:
The stem is modified to perform various functions. One of the modifications of the stem is the development of thorns in the Bougainvillea which helps in providing support and nutrients to the various parts of the plants.

Additional Information: -The plants are either bushes, trees, or vines with thorns.
-The flower has no petals which are the characteristic feature, instead, sepals are present in the place of petals.
-The sepals are bract-like, three in number, large and colorful.
-These sepals enclose three waxy flowers inside them.
-The flowers are mainly bright in color and are covered by three or six sepals.
-The sepal-life bracts are very thin and papery, this is named after it called paper flower.
-The fruit is dry and hard, having a five-lobed called a scheme.
-It is an ornamental plant with high salt tolerance and grows in a warm habitat.
-It spreads out very fast and requires sunlight for its growth.
-The thorns of this plant are tough and have a nail-like appearance.
-Bougainvillaea is considered a national flower in Grenada.
-The sap of the flower may be highly toxic and may cause serious skin rashes.
-It the herbicides are applied to the wounds of the plant, then immediately the plant will be killed.

So, The correct answer is option D.

Note: A botanist Philibert Commercon who traveled with the French navy admiral Louis Antoine de Bougainville was the first European to describe these plants. He observed this plant during his voyage of circumnavigation of the earth with the navy admiral and was named after him. The plant was first published in 1789 in the book Genera Plantarum as ‘Bougainvillea’. The plant genus was spelled differently for a while until the botanists found its suitable name which was ‘Bougainvillea' in the 1930s as is found in the Index Kewensis.