221.
Which will decay faster if exposed freely to the air
A
Heart wood
B
Sap wood
C
Wood with lots of fibres
D
Soft wood
Answer :
Sap wood
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222.
Which one of the following statements pertaining to plant structure is correct
A
Cork lacks stomata, but lenticels carry out transpiration
B
Passage cells help in transfer of food form cortex to phloem
C
Sieve tube elements posses cytoplasm but no nuclei
D
The shoot apical meristem has a quiescent centre
Answer :
Cork lacks stomata, but lenticels carry out transpiration
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223.
A narrow layer of thin walled cells found between phloem/bark and wood of a dicot is
A
Cork cambium
B
Vascular cambium
C
Endodermis
D
Pericycle
Answer :
Vascular cambium
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224.
In monocotyledon roots, the histogen present at the apex of the root tip is
A
Dermatogen
B
Procambium
C
Calyptrogen
D
Plerome
Answer :
Calyptrogen
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225.
Many grass leaves are capable to folding and unfolding due to
A
Parallel veins
B
Isobilateral nature
C
Thin lamina
D
Bulliform cells
Answer :
Bulliform cells
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226.
What is not true about sclereids?
A
These are parenchyma cells with thickened lignified walls
B
These are elongated and flexible with tapered ends
C
These are commonly found in the shells of nuts and in the pulp of guava, pear, etc
D
These are also called the stone cells
Answer :
These are parenchyma cells with thickened lignified walls
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227.
The dicot root is identify by the presence of
A
Exarch xylem
B
2-6 radial vascular bundles
C
> 6 radial vascular bundles
D
Absence of pith and endodermis
Answer :
2-6 radial vascular bundles
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228.
Age of a tree can be estimated by:
A
biomass
B
number of annual rings
C
diameter of its heartwood
D
its height and girth
Answer :
number of annual rings
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229.
Identify the wrong statement in context of heartwood:
A
It is highly durable
B
It conducts water and minerals efficiently
C
It comprises dead elements with highly lignified walls
D
Organic compounds are deposited in it
Answer :
It conducts water and minerals efficiently
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230.
Formation of which tissue is example of dedifferentiation
A
Inter fascicular cambium
B
Apical meristem
C
Intra fascicular cambium
D
Inter calary meristem
Answer :
Inter fascicular cambium
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