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Anatomy of Flowering Plants · Question 39

AIPMT 2015 (Cancelled)MCQEasy📈 Topic in 12% papers+4−1
1

A major characteristic of the monocot root is the presence of :

  1. Vasculature without cambium
  2. Cambium sandwiched between phloem and xylem along the radius
  3. Open vascular bundles
  4. Scattered vascular bundles

Answer

(1) Vasculature without cambium

Solution

As per NCERT, the monocot root has usually more than six (polyarch) xylem bundles, with xylem and phloem arranged alternately on different radii (radial arrangement).

∵ No cambium is formed between xylem and phloem ⇒ monocot roots do not undergo secondary growth.

⇒ Cambium between phloem and xylem along the radius / open bundles are features of dicot stems, and scattered vascular bundles are a feature of the monocot stem.

∴ Monocot root has vasculature without cambium.

Answer: (1)

AIPMT 2015 (Cancelled)

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2

Vascular bundles in monocotyledons are considered closed because

  1. There are no vessels with perforations
  2. Xylem is surrounded all around by phloem
  3. A bundle sheath surrounds each bundle
  4. Cambium is absent
AIPMT 2015 (Cancelled)
3

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
AIPMT 2014
4

Tracheids differ from other tracheary elements in :

  1. being imperforate
  2. having Casparian strips
  3. lacking nucleus
  4. being lignified
AIPMT 2014
5

Lenticels are involved in

  1. Food transport
  2. Photosynthesis
  3. Transpiration
  4. Gaseous exchange
NEET 2013
6

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
NEET 2013
7

Interfascicular cambium develops from the cells of :

  1. Endodermis
  2. Pericycle
  3. Medullary rays
  4. Xylem parenchyma
NEET 2013
8

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

  1. Phellogen
  2. Intercalary meristem
  3. Apical meristem
  4. Lateral meristem
NEET 2013 (Karnataka)
9

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)
10

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)
11

Gymnosperms are also called softwood spermatophytes because they lack

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

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