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Anatomy of Flowering Plants · Question 40

AIPMT 2015 (Cancelled)MCQEasy📈 Topic in 38% papers+4−1
1

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

Answer

(4) Cambium is absent

Solution

As per NCERT, in dicotyledonous stems cambium is present between phloem and xylem; such vascular bundles, because of the presence of cambium, possess the ability to form secondary xylem and phloem tissues and hence are called open vascular bundles.

⇒ In monocotyledons, the vascular bundles have no cambium present in them.

∵ They do not form secondary tissues ⇒ they are referred to as closed.

Answer: (4)

AIPMT 2015 (Cancelled)

Keep practising — Anatomy of Flowering Plants

2

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
3

Tracheids differ from other tracheary elements in :

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

Lenticels are involved in

  1. Food transport
  2. Photosynthesis
  3. Transpiration
  4. Gaseous exchange
NEET 2013
5

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
6

Interfascicular cambium develops from the cells of :

  1. Endodermis
  2. Pericycle
  3. Medullary rays
  4. Xylem parenchyma
NEET 2013
7

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)
8

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)
9

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)
10

Gymnosperms are also called softwood spermatophytes because they lack

  1. Cambium
  2. Thick-walled tracheids
  3. Phloem fibres
  4. Xylem fibres
AIPMT 2012 (Prelims)
11

Water containing cavities in vascular bundles are found in

  1. Maize
  2. Cycas
  3. Sunflower
  4. Pinus
AIPMT 2012 (Prelims)

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