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Anatomy of Flowering Plants · Question 60

AIPMT 2010 (Prelims)MCQEasy📈 Topic in 38% papers+4−1
1

Heartwood differs from sapwood in –

  1. Having dead and non-conducting elements
  2. Being susceptible to pests and pathogens
  3. Presence of rays and fibres
  4. Absence of vessels and parenchyma

Answer

(1) Having dead and non-conducting elements

Solution

As per NCERT, in old trees the central (inner) secondary xylem becomes dark brown due to deposition of tannins, resins, oils, gums, aromatic substances and essential oils; this is heartwood.

Heartwood consists of dead elements with highly lignified walls and does not conduct water; it gives mechanical support.

Sapwood (the peripheral, lighter region) is involved in conduction of water and minerals.

Heartwood is resistant (not susceptible) to microorganisms and insects, and both regions contain rays, fibres and vessels.

∴ Heartwood differs in having dead and non-conducting elements.

Answer: (1)

AIPMT 2010 (Prelims)

Keep practising — Anatomy of Flowering Plants

2

Which one of the following is not a lateral meristem ?

  1. Interfascicular cambium
  2. Intercalary meristem
  3. Intrafascicular cambium
  4. Phellogen
AIPMT 2010 (Prelims)
3

The chief water conducting elements of xylem in gymnosperms are :

  1. Fibres
  2. Transfusion tissue
  3. Vessels
  4. Tracheids
AIPMT 2010 (Prelims)
4

In barley stem vascular bundles are -

  1. Closed and scattered
  2. Closed and radial
  3. Open and in a ring
  4. Open and scattered
AIPMT 2009
5

Palisade parenchyma is absent in leaves of -

  1. Mustard
  2. Sorghum
  3. Soybean
  4. Gram
AIPMT 2009
6

The annular and spirally thickened conducting elements generally develop in the protoxylem when the root or stem is -

  1. Maturing
  2. Widening
  3. Elongating
  4. Differentiating
AIPMT 2009
7

Anatomically fairly old dicotyledonous root is distinguished from the dicotyledonous stem by :

  1. Absence of secondary phloem
  2. Presence of cortex
  3. Position of protoxylem
  4. Absence of secondary xylem
AIPMT 2009
8

Vascular tissues in flowering plants develop from:

  1. plerome
  2. periblem
  3. phellogen
  4. dermatogen
AIPMT 2008
9

The length of different internodes in a culm of sugarcane is variable because of:

  1. shoot apical meristem
  2. position of axillary buds
  3. size of leaf lamina at the node below each internode
  4. intercalary meristem
AIPMT 2008
10

Passage cells are thin-walled cells found in:-

  1. Endodermis of roots facilitating rapid transport of water from cortex to pericycle
  2. Testa of seeds to enable emergence of growing embryonic axis during seed germination.
  3. Phloem elements that serve as entry points for substances for transport to other plant parts
  4. Central region of style through which the pollen tube grows towards the ovary.
AIPMT 2007
11

For a critical study of secondary growth in plants, which one of the following pairs is suitable?

  1. Deodar and fern
  2. Wheat and maiden hair fern
  3. Sugarcane and sunflower
  4. Teak and pine
AIPMT 2007

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