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Anatomy of Flowering Plants · Question 41

AIPMT 2014MCQMedium📈 Topic in 12% papers+4−1
1

You are given a fairly old piece of dicot stem and a dicot root. Which of the following anatomical structures will you use to distinguish between the two?

  1. Secondary xylem
  2. Protoxylem
  3. Secondary phloem
  4. Cortical cells

Answer

(2) Protoxylem

Solution

Both old dicot stem and old dicot root undergo secondary growth, both have secondary xylem, secondary phloem and (crushed) cortex, so these cannot distinguish them.

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

The primary xylem persists near the centre even after secondary growth, so the position of protoxylem distinguishes the two.

Answer: (2)

AIPMT 2014

Keep practising — Anatomy of Flowering Plants

2

Tracheids differ from other tracheary elements in :

  1. being imperforate
  2. having Casparian strips
  3. lacking nucleus
  4. being lignified
AIPMT 2014
3

Lenticels are involved in

  1. Food transport
  2. Photosynthesis
  3. Transpiration
  4. Gaseous exchange
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4

Age of a tree can be estimated by :

  1. Diameter of its heartwood
  2. Number of annual rings
  3. Its height and girth
  4. Biomass
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5

Interfascicular cambium develops from the cells of :

  1. Endodermis
  2. Pericycle
  3. Medullary rays
  4. Xylem parenchyma
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6

Meristematic tissue responsible for increase in girth of tree trunk is :

  1. Phellogen
  2. Intercalary meristem
  3. Apical meristem
  4. Lateral meristem
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7

Which of the following statements is not true for stomatal apparatus ?

  1. Stomata are involved in gaseous exchange
  2. Inner walls of guard cells are thick
  3. Guard cells invariably possess chloroplasts and mitochondria
  4. Guard cells are always surrounded by subsidiary cells
NEET 2013 (Karnataka)
8

As compared to a dicot root, a monocot root has

  1. More abundant secondary xylem
  2. Relatively thicker periderm
  3. Many xylem bundles
  4. Inconspicuous annual rings
AIPMT 2012 (Mains)
9

Gymnosperms are also called softwood spermatophytes because they lack

  1. Cambium
  2. Thick-walled tracheids
  3. Phloem fibres
  4. Xylem fibres
AIPMT 2012 (Prelims)
10

Water containing cavities in vascular bundles are found in

  1. Maize
  2. Cycas
  3. Sunflower
  4. Pinus
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11

Closed vascular bundles lack

  1. Ground tissue
  2. Conjunctive tissue
  3. Cambium
  4. Pith
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