Tag: importance of plants

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Multiple choice botany plants in daily life types of wood importance of plants secondary growth in stem

Islands of phloem are found in the wood of strychnos. This is due to.

  1. Development from wood parenchyma

  2. Differentiation from vascular ray

  3. Intrusion of phloem through vascular ray

  4. Formation from separated cambial strip
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

In certain plants like Strychnos, anomalous secondary growth occurs where the cambium produces phloem islands within the xylem, a phenomenon known as interxylary phloem.

Multiple choice botany plants in daily life types of wood importance of plants secondary growth in stem

Which one is an example of wood fibres?

  1. Hemp

  2. Flax

  3. Cotton

  4. Zingiber.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Fibre is a narrow, elongated cell with thick lignified wall and narrow lumen tapering to a wedge-shape at both ends. Sometimes the deposition of lignin is so thick as to obliterate the central lumen. The fibres appear more or less angular in cross-sectional view with little intercellular spaces. The cell wall is pitted and may show slight indentation (ex. Zingiber).

So, the correct answer is 'Zingiber.'

Multiple choice botany plants in daily life types of wood importance of plants secondary growth in stem

Balck wood is obtained from

  1. Dalbergia

  2. Albizzia

  3. Manihot

  4. Salvia
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
  • Dalbergia is also known as African Blackwood.
  • It is a flowering plant belonging to the family Fabaceae which are native to seasonally dry regions of Africa.
  • It produces dense, lustrous wood which is reddish to pure black in colour.
  • So, the correct answer is 'Dalbergia'.
Multiple choice botany plants in daily life types of wood importance of plants secondary growth in stem

Out of diffuse porous and ring porous woods, which is correct?

  1. Ring porous wood carries more water for short period.

  2. Diffuse porous wood carries more water.

  3. Ring porous wood carries more water when need is higher.

  4. Diffuse porous wood is less specialised but conducts water rapidly throughout.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
  • In ring-porous trees, the vessels laid down at the beginning of the growing season are much larger than subsequent vessels laid down at the end of the season. Diffuse porous trees form the vessel of roughly the same radial diameter throughout the growing season.

So, the correct option is 'Diffuse porous wood is less specialized but conducts water rapidly throughout'
Multiple choice botany plants in daily life types of wood importance of plants secondary growth in stem

Spring wood is $\underline{(a)}$ in colour & has $\underline{(b)}$ density as compared to heart wood.

  1. (a)-Darker, (b)-Heavier

  2. (a)-Lighter, (b)-Lower

  3. (a)-Darker, (b)-Lower

  4. (a)-Lighter, (b)-Heavier
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Springwood is formed due to the rapid activity of the vascular cambium. The vessels are wider in lumen. It is light and has low density. Heartwood is the wood that has non-functional vessels due to deposition of lignin by tyloses. It appears dark and has more density. So, the correct answer is springwood is lighter in colour and has a lower density as compared to heartwood.

Multiple choice botany plants in daily life types of wood importance of plants secondary growth in stem

Match column i with column - ii and select the correct answer.

Coloumn-1 Column-2
A Spring wood  Duramen
B Autumn wood  Alburnum
c Heart wood  Late wood 
d Sap wood  Early wood 

  1. A - (iv), B - (iii), C -(i) , D - (ii)

  2. A -(iii), B -(iv), C- (ii) , D-(ii)

  3. A - (iii), B - (iv), C-(i) , D-(ii)

  4. A-(iii), B - (iv) , (ii) , D-(i)
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A. Springwood is the soft and porous portion of an annual ring of wood developed during the early growing season or spring season and is known as earlywood.

B. Autumn wood constitutes a narrow strip in the annual ring formed during the winter season and are dark in colour with high density, it is also known as latewood.
C. Heartwood is the dead, central part in the wood of trees, the cells usually contain tannins and are also known as duramen.
D. Sapwood is the outer, living layers of the wood of trees that can transport water and minerals to the crown of the tree and is also known as alburnum.
So, the correct answer is 'A - (iV), B - (iii), C -(i) , D - (ii)'.

Multiple choice botany plants in daily life types of wood importance of plants secondary growth in stem

Which of the following statements are correct about heart wood? 
i) It does not help in water conduction.
ii) It is also called alburnum.
iii) It is light in colour and is very soft
iv) It has tracheary elements which are filled with tannins, resins,etc.

  1. (ii) and (iv)

  2. (i), (ii) and (iii)

  3. (i) and (iv)

  4. None of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
  • Heartwood is also known as duramen.
  • It is the central dead part wood of trees. 
  • The cells in this region contain tannins or resins that give it a dark colour.
  • It is inactive and does not conduct water.
  • So, the correct answer is '(i) and (iv)'.
Multiple choice botany plants in daily life types of wood importance of plants secondary growth in stem

Alburnum is also called as 

  1. Autmn wood

  2. Heart wood

  3. Sap wood

  4. Spring wood
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
  • The outer, new living layers of a secondary wood of a tree where transport of water and minerals to the crown of the tree take place are called alburnum. 
  • Alburnum is also known as sapwood.
  • It contains high moisture content than a heartwood.
  • So, the correct answer is 'Sapwood'.