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Anatomy of Flowering Plants · Question 66

AIPMT 2009MCQMedium📈 Topic in 12% papers+4−1
1

Anatomically fairly old dicotyledonous root is distinguished from the dicotyledonous stem by :

  1. Absence of secondary phloem
  2. Presence of cortex
  3. Position of protoxylem
  4. Absence of secondary xylem

Answer

(3) Position of protoxylem

Solution

An old dicot root and an old dicot stem both show secondary xylem and secondary phloem, and both have cortex.

As per NCERT, in roots the protoxylem lies towards the periphery and metaxylem towards the centre (exarch), while in stems the protoxylem lies towards the centre (endarch).

The position of protoxylem distinguishes an old dicot root from a dicot stem.

Answer: (3)

AIPMT 2009

Keep practising — Anatomy of Flowering Plants

2

Vascular tissues in flowering plants develop from:

  1. plerome
  2. periblem
  3. phellogen
  4. dermatogen
AIPMT 2008
3

The length of different internodes in a culm of sugarcane is variable because of:

  1. shoot apical meristem
  2. position of axillary buds
  3. size of leaf lamina at the node below each internode
  4. intercalary meristem
AIPMT 2008
4

Passage cells are thin-walled cells found in:-

  1. Endodermis of roots facilitating rapid transport of water from cortex to pericycle
  2. Testa of seeds to enable emergence of growing embryonic axis during seed germination.
  3. Phloem elements that serve as entry points for substances for transport to other plant parts
  4. Central region of style through which the pollen tube grows towards the ovary.
AIPMT 2007
5

For a critical study of secondary growth in plants, which one of the following pairs is suitable?

  1. Deodar and fern
  2. Wheat and maiden hair fern
  3. Sugarcane and sunflower
  4. Teak and pine
AIPMT 2007
6

A common structural feature of vessel elements and sieve tube elements is-

  1. Enucleate condition
  2. Presence of p-protein
  3. Thick secondary walls
  4. Pores on lateral wall
AIPMT 2006
7

In a woody dicotyledonous tree, which of the following parts will mainly consist of primary tissues ?

  1. Shoot tips and root tips
  2. Flowers, fruit and leaves
  3. Stem and root
  4. All parts
AIPMT 2005
8

The apical meristem of the root is present

  1. In all the roots
  2. Only in tap roots
  3. Only in adventitious roots
  4. Only in radicles
AIPMT 2003
9

Diffuse porous wood is characteristic of those plants which are growing in :

  1. Tropics
  2. Temperate climate
  3. Alpine region
  4. Cold winter regions
AIPMT 2003
10

The cells of the quiescent centre are characterised by :

  1. Having light cytoplasm and small nuclei
  2. Dividing regularly to add to tunica
  3. Having dense cytoplasm and prominent nuclei
  4. Dividing regularly to add to the corpus
AIPMT 2003
11

Which of the following statements is true ?

  1. Tracheids are unicellular and with wide lumen
  2. Tracheids are multicellular and with narrow lumen
  3. Vessels are multicellular and with wide lumen
  4. Vessels are unicellular and with narrow lumen
AIPMT 2002

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