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Anatomy of Flowering Plants · Question 34

NEET 2017MCQEasy📈 Topic in 38% papers+4−1
1

Identify the wrong statement in context of heartwood :

  1. It is highly durable.
  2. It comprises dead elements with highly lignified walls
  3. It conducts water and minerals efficiently
  4. Organic compounds are deposited in it

Answer

(3) It conducts water and minerals efficiently

Solution

As per NCERT, heartwood is dark brown due to deposition of organic compounds like tannins, resins, oils, gums, aromatic substances and essential oils in the central layers of the stem.

These substances make it hard, durable and resistant to micro-organisms and insects.

It comprises dead elements with highly lignified walls and does not conduct water, but gives mechanical support to the stem.

Option (3) is wrong — water and minerals are conducted by sapwood (alburnum).

Answer: (3)

NEET 2017

Keep practising — Anatomy of Flowering Plants

2

Specialised epidermal cells surrounding the guard cells are called -

  1. Lenticels
  2. Complementary cells
  3. Bulliform cells
  4. Subsidiary cells
NEET 2016 (Phase 1)
3

Cortex is the region found between -

  1. endodermis and pith
  2. endodermis and vascular bundle
  3. epidermis and stele
  4. pericycle and endodermis
NEET 2016 (Phase 2)
4

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
NEET 2016 (Phase 2)
5

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
6

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)
7

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)
8

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
9

Tracheids differ from other tracheary elements in :

  1. being imperforate
  2. having Casparian strips
  3. lacking nucleus
  4. being lignified
AIPMT 2014
10

Lenticels are involved in

  1. Food transport
  2. Photosynthesis
  3. Transpiration
  4. Gaseous exchange
NEET 2013
11

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

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