Tag: botany

Quizzes (264) Questions (5276)

Questions Related to botany

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

Wood with vessels of unequal diameter and with the largest vessels localized in the early wood is called.

  1. Diffuse porous wood

  2. Ring porous wood

  3. Stratified wood

  4. Non-stratified wood
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Ring porous wood is characterized by vessels of unequal diameter where the larger vessels are localized in the early wood (spring wood). Diffuse porous wood has vessels of more uniform size distributed throughout the annual ring.

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

Select the correct option:

Increase in girth of the plant as a result of the activities of primary and secondary lateral meristems is called

  1. primary growth

  2. lateral growth

  3. secondary growth

  4. intercalary growth
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Secondary growth is characterized by an increase in thickness or girth of the plant, and is caused by cell division in the lateral meristem, which are lacking in herbaceous plants. Lateral meristems include the vascular cambium and, in woody plants, the cork cambium.

So, the correct option is 'Secondary growth'.

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 heartwood?

(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. (ii), (iii) and (iv)

  4. (i) and (iv)
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Heartwood is non -functional as it does not conduct water and minerals. It may have ingrowths of tylosis, deposition of resins, tannins and other secondary metabolites of the plant. It is hard and is also called duramen.

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

Select the correct option:

In (i) porous wood, vessels are very broad in the (ii) wood and are quite narrow in the (iii) wood. This kind of wood is present in (iv) and it translocates (v) amount of water when required by the plant.
Select the correct fill ups for the above paragraph.

  1. (i)-diffuse, (ii)-autumn, (iii)-spring, (iv)-Dalbergiasissoo, (v)-more

  2. (i)-diffuse, (ii)-spring, (iii)-autumn, (iv)-Syzygiumcumini, (v)-less

  3. (i)-ring, (ii)-spring, (iii)-autumn, (iv)-Dalbergiasissoo, (v)-more

  4. (i)-ring, (ii)-autumn, (iii)-spring, (iv)-Syzygiumcumini, (v)-less
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Due to the presence of vessels, the wood is said to be porous. Vessels present in the spring or earlywood are very large and form conspicuous rings in this wood while those present in the autumn wood or latewood are small or only moderately large. The wood with these characteristics is called ring porous.
This kind of wood present in Dalbergia sissoo( Papilionoideae). It translocates more amount of water when required by the plant.
So, the correct answer is '(i) ring, (ii)- spring, (iii)- autumn, (iv)- Dalbergiasissoo, (v)- more'.
Multiple choice botany plants in daily life types of wood importance of plants secondary growth in stem

Central resin-clogged secondary xylem is?

  1. Central wood

  2. Heartwood

  3. Alburnum

  4. Hardwood
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A.Central wood - The hard fibrous material that forms the main substance of the trunk or branches of a tree or shrub, used for fuel or timber.

B.Heart wood -  The inner or central dark colored non-functional resin clogged wood or secondary xylem formed during secondary growth in dicot stem is called Heart wood or duramen.

C.Alburnum– The outer light coloured functional wood which contains living cells formed during secondary growth in dicot stem is called Alburnum or sap wood.

D.Hardwood – secondary xylem or wood present in broad leaved tropical and temperate forests.

So, the correct option is ‘Heart wood’.

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

Each annual ring or growth ring consists of two strips of.

  1. Antumn wood and spring wood

  2. Heart wood and sap wood

  3. Xylem and phleom

  4. Cork and cortex
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A ring of wood or secondary xylem formed by the association of spring wood and autumn wood is called annual ring. In every year one annual ring formation occurs in dicot stems.

So, the correct option is ‘autumn wood and springwood’.

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

A cut trunk shows $26$ concentric rings of spring wood and autumn wood in alternate rows. The age of trunk would be.

  1. $13$ years
  2. $26$ years
  3. $52$ years
  4. $104$ years
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In dicotyledonous stems, during intra stellar secondary growth, a ring of cambium called vascular cambium is formed.  In the plants growing temperate regions, the activity of vascular cambium is influenced by the existence of maximum seasonal variations. In the spring or early summer, due to the existence of favourable conditions, a large amount of secondary xylem is formed. it is called Springwood or early wood. In the autumn season, due to the presence of unfavourable conditions, less amount of wood is formed. it is called autumn wood or latewood.  Every ring of spring wood and autumn wood together form into an annual ring. In the 26 rings, 13 rings constitute spring wood and 13 rings constitute autumn wood. So total 13 annual rings are present.

So, the correct option is '13 years'.