Tag: botany

Questions Related to botany

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

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

  1. Diffuse porous wood

  2. Ring porous wood

  3. Stratified wood

  4. Non-stratified wood

Show answer
Correct Option: A

Which of the following is incorrect statement?

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

  1. Wood is actually a secondary system

  2. Different types of woods are found on the basis of their composition and time of production

  3. Monocot and dicot plant show marked

  4. Increase in girth of dicot stem by vascular cambium only

Show answer
Correct Option: A

Which of the following is incorrect statement?

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

  1. Wood is actually a secondary xylem

  2. Different types of woods are found on the basis of their composition and time of production

  3. Monocot and dicot plant show marked variation in their internal structure

  4. Increase in girth of dicot stem by vascular cambium only

Show answer
Correct Option: A

Select the correct option:

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

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

  1. primary growth

  2. lateral growth

  3. secondary growth

  4. intercalary growth

Show answer
Correct Option: C
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'.

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

  1. (ii) and (iv)

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

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

  4. (i) and (iv)

Show answer
Correct Option: D
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)'

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.

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

  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

Show answer
Correct Option: C
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'.

Central resin-clogged secondary xylem is?

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

  1. Central wood

  2. Heartwood

  3. Alburnum

  4. Hardwood

Show answer
Correct Option: B
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’.

Alternate name of heart wood is

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

  1. Duramen

  2. Alburnum

  3. Primary xylem

  4. Spring wood

Show answer
Correct Option: A
Explanation:

A.Duramen – also called heart wood.

B.Alburnum – also called sap wood.

C.Primary xylem – also called hydromel.

D.Spring wood – also called early wood.

So, correct option is ‘duramen’.

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

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

  1. Antumn wood and spring wood

  2. Heart wood and sap wood

  3. Xylem and phleom

  4. Cork and cortex

Show answer
Correct Option: A
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’.

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

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

  1. $13$ years

  2. $26$ years

  3. $52$ years

  4. $104$ years

Show answer
Correct Option: A
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'.