IGCSE Biology Paper-2: Specimen Questions with Answers 127 - 127 of 203

Question 127

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MCQ▾

The diagram shows a flowering plant.

The diagram shows a flowering plant

The Diagram Shows a Flowering Plant

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To which group this plant belongs.

Choices

Choice (4)
a.Algae
b.Pteridophyte
c.Angiosperm
d.Gymnosperm

Answer

c.

Explanation

Angiosperms

  • 130 million years ago in Jurassic (dicot plant) and cretaceous (monocot plants) period of Mesozoic era. Tertiary period of Cenozoic era is called as Age of angiosperms.
  • Angiosperms are found in every habitat. They constitute more than 50 % of total plants on this earth.
  • Angiosperms are seed bearing, flowering vascular plants in which seeds are enclosed in fruits. The term angiosperm means ‘enclosed seeds’ as seeds (ovules) are found enclosed in the ovary wall.
  • Instead of cone, angiosperms bear flowers. The flower is the most characteristic structure of the angiosperms.
  • Flower is defined as a modified shoot meant essentially for the reproduction of the plant.
  • The flower usually develops as a branch from a bud, growing in the axil of a small leaf like structure known as bract. A stalk called pedicel, supports the flower in the axil of the bract. The upper swollen end of the pedicel called receptacle or thalamus bears all the floral parts.
  • A typical angiospermic flower consists of 4 whorls, viz. , calyx, corolla, androecium and gynoecium. Both, calyx and corolla are known as accessory or helping whorls. The androecium and gynoecium are called reproductive or essential whorls.
  • Androecium (stamen) is microsporophyll and gynoecium (carpel) is megasporophyll.
  • Megasporophyll is differentiated into ovary, style, and stigma.
The diagram shows a flowering plant

The Diagram Shows a Flowering Plant

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