Anatomy of flowering plant

Which sequence correctly illustrates the arrangement of layers from outside to inside in a dicot stem?

• (a) Hypodermis Endodermis Pericycle Phloem Xylem

• (b) Endodermis Hypodermis Pericycle Xylem Phloem

• (c) Hypodermis Endodermis Pericycle Xylem Phloem

• (d) Endodermis Hypodermis Pericycle Phloem Xylem

As compared to a dicot root, a monocot root has :

• (a) More abundant secondary xylem

• (b) Many xylem bundles

• (c) Inconspicuous annual rings

• (d) Relatively thicker periderm

A transverse section of stem is stained first with safranin and then with fast green following the usual schedule of double staining for the preparation of a permanent slide. What would be the colour of the stained xylem and phloem?

• (a) Red and green

• (b) Green and red

• (c) Orange and yellow

• (d) Purple and orange

Grass leaves curl inwards during very dry weather. Select the most appropriate reason from the following :

• (a) Closure of stomata

• (b) Flaccidity of bulliform cells

• (c) Shrinkage of air spaces in spongy mesophyll

• (d) Tyloses in vessels

Meristematic tissues have all these except :

• (a) Tubulin

• (b) Aspartine

• (c) Adenine

• (d) Lignin

In dicot root, cork cambium is formed by –

• (a) Cortex

• (b) hypodermis

• (c) Pericycle

• (d) Epidermis

Phellogen cuts –

• (a) Cork / phellogen inside and secondary cortex (phelloderm) outside

• (b) Cork outside and phelloderm inside

• (c) Both cork and phelloderm inside

• (d) Both cork and phelloderm outside

In spring season cambium is _______ active and produces ___________ wood.

• (a) More, late

• (b) More, early

• (c) Less, late

• (d) less, early

Early wood is formed –

• (a) In winter

• (b) In spring

• (c) Throughout the year

• (d) In Autumn

Annual or growth rings consist of –

• (a) Alternate rings of heart and early wood

• (b) Alternate rings of sapwood and heart wood

• (c) Alternate rings of early and late wood

• (d) Alternate rings of porous and non-porous wood