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Anatomy of Flowering Plants · Question 38

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

Read the different components from (1) to (4) in the list given below and tell the correct order of the components with reference to their arrangement from outer side to inner side in a woody dicot stem : (1) Secondary cortex (2) Wood (3) Secondary phloem (4) Phellem The correct order is :

  1. (3), (4), (2), (1)
  2. (4), (1), (3), (2)
  3. (4), (3), (1), (2)
  4. (1), (2), (4), (3)

Answer

(2) (4), (1), (3), (2)

Solution

As per NCERT, the cork cambium (phellogen) cuts off cells on both sides: the outer cells form cork (phellem) and the inner cells form secondary cortex (phelloderm). The vascular cambium cuts off secondary phloem towards the outside and secondary xylem (wood) towards the inside.

∴ From outside to inside: Phellem (4) → Secondary cortex (1) → Secondary phloem (3) → Wood (2).

Answer: (2)

AIPMT 2015

Keep practising — Anatomy of Flowering Plants

2

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
AIPMT 2015 (Cancelled)
3

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)
4

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
5

Tracheids differ from other tracheary elements in :

  1. being imperforate
  2. having Casparian strips
  3. lacking nucleus
  4. being lignified
AIPMT 2014
6

Lenticels are involved in

  1. Food transport
  2. Photosynthesis
  3. Transpiration
  4. Gaseous exchange
NEET 2013
7

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
8

Interfascicular cambium develops from the cells of :

  1. Endodermis
  2. Pericycle
  3. Medullary rays
  4. Xylem parenchyma
NEET 2013
9

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)
10

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)
11

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)

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