Anatomy of Flowering Plants Test - 85

A. Root – protoxylem is towards the pericycle and metaxylem is towards the medulla. It is called Exarch.

B. Stem – protoxylem is towards the medulla and metaxylem is towards the pericycle. It is called Endarch.

C. Leaves – the position of protoxylem and metaxylem is not specified.

D. Petiole – the position of protoxylem and metaxylem is not specified.

Increase in thickness of stem due to the formation of secondary tissues is called Secondary growth. It occurs mostly in dicotyledons. It takes place by the formation of lateral meristems like vascular cambium and cork cambium. Vascular cambium is responsible for the intra stelar secondary growth and cork cambium is responsible for extra stelar secondary  growth.

So, the correct option is ‘New tissues from lateral meristems’.

A. Conduction of water – xylem conducts water.

B.Storage of water – water storage parenchyma

C.Storage of food – cortex stores reserve food materials.

D. Strength – hypodermis and pericycle in dicot stem provides strength.

So, the correct option is ‘Storage of food’.

A.Monocot leaf – vascular bundles are covered by parenchymatous bundle sheath.

B. Monocot stem – vascular bundles are covered by sclerenchymatous fibres. So these are called fibrovascular bundles.

C. Monocot root – there is no any covering around the vascular bundles.

D. Dicot stem – there is no any covering around the vascular bundles.

So, the correct option is ‘Monocot stem’.

A.Pericycle – outer most part of the stele in roots and dicot stem.

B.Endodermis – innermost part of cortex in roots and dicot stem.

C. Cutinised – The outer walls of stem epidermal cells are cutinized i.e.covered by the cuticle.

D.Suberised – The walls of cork cells are suberized i.e. made up of suberin.

So, the correct option is ‘Endodermis’.

A.Vascular bundles arranged in a ring – found in T.s. of dicot stem

B.Scattered vascular bundles – found in T.s.of monocot stem

C.Closed vascular bundles – found in T.s.of monocot stem

D.Radial vascular bundles – found in T.s.of dicot and monocot roots.

So, the correct option is ‘Vascular bundles arranged in a ring’.

The small strip of cambium formed between the vascular bundles in dicot stem is called inter fascicular cambium. It is formed by the dedifferentiation of parenchyma present in the medullary rays.

So, the correct option is ‘Medullary rays’.

In monocot stem, the cortex is not differentiated into hypodermis, general cortex, and endodermis. In the place of the cortex a large, wide region is present called ground tissue is present. It is parenchymatous, stores water and food materials. In this vascular bundles are present scatteredly.

A.xylem is surrounded by phloem – hadrocentric or amphicribal vascular bundles

B.phloem is surrounded by xylem – Leptocentric or Amphivasal vascular bundles.

C.xylem and phloem occur on the same radius – collateral vascular bundle.

D.xylem and phloem are found on different radii – Radial vascular bundle.