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Anatomy of Flowering Plants · Question 27

NEET (UG) 2019MCQEasy📈 Topic in 38% papers+4−1
1

Which of the statements given below is not true about formation of Annual Rings in trees?

  1. Activity of cambium depends upon variation in climate.
  2. Annual rings are not prominent in trees of temperate region.
  3. Annual ring is a combination of spring wood and autumn wood produced in a year.
  4. Differential activity of cambium causes light and dark bands of tissue – early and late wood respectively

Answer

(2) Annual rings are not prominent in trees of temperate region.

Solution

As per NCERT, the activity of cambium is under the control of many physiological and environmental factors; in temperate regions the climatic conditions are not uniform through the year.

⇒ Cambium is very active in spring (early wood: lighter, many wide vessels) and less active in winter (late wood: darker, fewer narrow vessels).

∴ The two kinds of woods appear as alternate concentric rings (annual rings), which are prominent in trees of temperate regions. Statement (2) is not true.

Answer: (2)

NEET (UG) 2019

Keep practising — Anatomy of Flowering Plants

2

Stomata in grass leaf are

  1. kidney-shaped
  2. barrel-shaped
  3. dumb-bell shaped
  4. rectangular
NEET 2018
3

Secondary xylem and phloem in dicot stem are produced by

  1. vascular cambium
  2. axillary meristems
  3. apical meristems
  4. phellogen
NEET 2018
4

Casparian strips occur in

  1. pericycle
  2. epidermis
  3. endodermis
  4. cortex
NEET 2018
5

Plants having little or no secondary growth are

  1. deciduous angiosperms
  2. grasses
  3. cycads
  4. conifers
NEET 2018
6

The vascular cambium normally gives rise to :

  1. Primary phloem
  2. Secondary xylem
  3. Periderm
  4. Phelloderm
NEET 2017
7

Which of the following is made up of dead cells ?

  1. Collenchyma
  2. Xylem parenchyma
  3. Phellem
  4. Phloem
NEET 2017
8

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
NEET 2017
9

Specialised epidermal cells surrounding the guard cells are called -

  1. Lenticels
  2. Complementary cells
  3. Bulliform cells
  4. Subsidiary cells
NEET 2016 (Phase 1)
10

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)
11

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)

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