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Anatomy of Flowering Plants · Question 37

NEET 2016 (Phase 2)MCQMedium📈 Topic in 38% papers+4−1
1

The balloon-shaped structures called tyloses

  1. are extensions of xylem parenchyma cells into vessels
  2. originate in the lumen of vessels
  3. are linked to the ascent of sap through xylem vessels
  4. characterize the sapwood

Answer

(1) are extensions of xylem parenchyma cells into vessels

Solution

Tyloses are balloon-like outgrowths of the adjoining xylem parenchyma (or ray parenchyma) cells which enter the lumen of vessels through the pits. ⇒ (1) is correct.

∵ They arise from parenchyma cells, not inside the vessel itself; they plug the vessels and so stop (not aid) the conduction of water; they are characteristic of the non-conducting heartwood, not the sapwood.

Answer: (1)

NEET 2016 (Phase 2)

Keep practising — Anatomy of Flowering Plants

2

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)
AIPMT 2015
3

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)
4

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)
5

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
6

Tracheids differ from other tracheary elements in :

  1. being imperforate
  2. having Casparian strips
  3. lacking nucleus
  4. being lignified
AIPMT 2014
7

Lenticels are involved in

  1. Food transport
  2. Photosynthesis
  3. Transpiration
  4. Gaseous exchange
NEET 2013
8

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
9

Interfascicular cambium develops from the cells of :

  1. Endodermis
  2. Pericycle
  3. Medullary rays
  4. Xylem parenchyma
NEET 2013
10

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)
11

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)

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