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Anatomy of Flowering Plants · Question 69

AIPMT 2007MCQEasy📈 Topic in 12% papers+4−1
1

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.

Answer

(1) Endodermis of roots facilitating rapid transport of water from cortex to pericycle

Solution

As per NCERT, the innermost layer of the cortex of the root is the endodermis, made of a single layer of barrel-shaped cells with no intercellular spaces; their tangential and radial walls have a deposition of water-impermeable, waxy suberin as Casparian strips.

⇒ In older roots, some endodermal cells opposite the protoxylem remain thin-walled and without such thickening; these are passage cells.

∵ Water and minerals can pass through these cells directly from the cortex to the pericycle and then to the xylem.

∴ Passage cells are found in the endodermis of roots, facilitating rapid transport of water from cortex to pericycle.

Answer: (1)

AIPMT 2007

Keep practising — Anatomy of Flowering Plants

2

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
3

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
4

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
5

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
6

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
7

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
8

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
9

Axillary bud and terminal bud derived from the activity of : -

  1. Apical meristem
  2. Parenchyma
  3. Lateral meristem
  4. Intercalary meristem
AIPMT 2002
10

Four radial vascular bundles are found in : -

  1. Monocot stem
  2. Dicot stem
  3. Dicot root
  4. Monocot root
AIPMT 2002
11

Vessels are found in:

  1. Most of the angiosperms and a few gymnosperms
  2. All angiosperms and some gymnosperms
  3. All pteridophyta
  4. All angiosperms, all gymnosperms and some pteridophyta
AIPMT 2002

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