Which one of the followings option shows the correct labelling of the parts marked as A, B, C and D in the given figure a lenticel?
A Epidermis, B Secondary cortex, C Cork cambium, D Cork
A Pore, B Cork cambium, C Secondary cortex, D Cork
A Pore, B Cork, C Complimentary cells, D Cork cambium
A Epidermis, B Complimentary cells, C Cork cambium, D Secondary cortex
Correct Answer :
D. A Epidermis, B Complimentary cells, C Cork cambium, D Secondary cortex
Most of the cells of phellem are dead. But at some places living cells are also found. Suberin is not deposited in these places, These places are known as Lenticels. Lenticels are certain loosely arranged areas in the periderm formed due to rapid activity of phellogen. Lenticels appears on the outer surface of the plant either in small points or in the form of areas of protruberance. Usually they are formed below the stomata. These cells are also known as complementary cells/complementary tissue and helps in gaseous exchange and transpiration.
Related Questions
The length of different internodes in a culm of sugarcane is variable because of
size of leaf lamina at the node below each internode
intercalary meristem
shoot apical meristem
position of axillary buds
A vascular bundle in which the protoxylem is pointing to the periphery is called __________.
endarch
exarch
radial
closed
Cork cambium and vascular cambium are
the parts of secondary xylem and phloem.
the parts of pericycle.
lateral meristems.
apical meristems.
A tissue is a group of cells which are
similar in origin, but dissimilar in form and function.
dissimilar in origin, form and function.
dissimilar in origin, but similar in form and function.
similar in origin, form and function.
Which one of the following option shows the correct labelling of the parts marked as A, B, C and D in the given figure of a typical dicot root?
A Primary phloem, B Vascular cambium, C Secondary phloem, D Primary xylem
A Secondary phloem, B Vascular cambium, C Primary phloem, D Primary xylem
A Primary phloem, B Primary xylem, C Secondary phloem, D Vascular cambium
A Secondary phloem, B Primary xylem, C Primary phloem, D Vascular cambium
In land plants, the guard cells differ from other epidermal cells in having
cytoskeleton.
mitochondria.
endoplasmic reticulum.
chloroplasts.
A plant tissue when stained showed the presence of hemicellulose and pectin in cells wall of its cells. The tissue is called
collenchyma
sclerenchyma
xylem
meristem
Which of the following is responsible for the formation of an embryonic shoot called axillary bud?
Lateral meristem
Apical meristem
Intercalary meristem
Both
Which of the following statements are correct ?
- Xylem transports water and minerals.
- Gymnosperms lack sieve tubes and companion cells in phloem.
- The first formed primary xylem is called metaxylem.
- Phloem fibres (bast fibres) are made up of collenchymatous cells.
(i) and (iii)
(i) and (ii)
(iii) and (iv)
(i) and (iv)
Gymnosperms are also called soft wood spermatophytes because they lack
cambium
phloem fibres
thick-walled tracheids
xylem fibres
Which of the following statements is correct?
Lenticels occur in most woody trees.
Sclerenchymatous cells are usually present in cortex.
The vascular tissue system is divided into three main zones- cortex, pericycle and pith.
The conjoint vascular bundles usually have the xylem located only on the outer side of the phloem.
Which one of the followings option shows the correct labelling of the parts marked as A, B, C and D in the given figure a lenticel?
A Epidermis, B Secondary cortex, C Cork cambium, D Cork
A Pore, B Cork cambium, C Secondary cortex, D Cork
A Pore, B Cork, C Complimentary cells, D Cork cambium
A Epidermis, B Complimentary cells, C Cork cambium, D Secondary cortex
The __________ occurs in layers below the epidermis in dicotyledonous plants.
parenchyma
sclerenchyma
collenchyma
aerenchyma
Phellogen and phellem respectively denote
cork and cork cambium,
cork cambium and cork,
secondary cortex and cork,
cork and secondary cortex,
The trees growing in desert will
show alternate rings of xylem and sclerenchyma.
have only conjunctive tissue and phloem is formed by the activity of cambium.
show distinct annual rings.
not show distinct annual rings.
A narrow layer of thin walled cells found between phloem/ bark and wood of a dicot is
cork cambium
vascular cambium
endodermis
both (a) & (c)
Xylem functions as a conducting tissue for water and minerals from _________to the ______and__________.
roots, stems, leaves
stems, roots, leaves
leaves, stems, roots
leaves, stems, leaves
Cells of permanent tissues are specialized
functionally.
only structurally.
both structurally and functionally.
for mitosis.
Which of the following are present in monocot root ?
conjoint, collateral, open polyarch vascular bundle.
exodermis, endarch, tetrarch closed vascular bundles.
suberized exodermis, casparian strip, passage cells, cambium.
suberized exodermis, polyarch xylem, pith.
Bast fibres are made up of _____________cells.
sclerenchymatous
chlorenchymatous
parenchymatous
aerenchymatous
The given figure shows the secondary growth in a dicot stem. Their parts are marked as A, B, C, D, E & F. Choose the correct labelling of the parts marked as A to F.
A Phellem, B Phellogen, C Medullary rays, D Secondary xylem, E Secondary phloem, F Cambium ring
A Phellem, B Phellogen, C Medullary rays, D Secondary phloem, E Secondary xylem, F Cambium ring
A Phellogen, B Phellem, C Medullary rays, D Secondary xylem, E Secondary phloem, F Cambium ring
A Phellem, B Phellogen, C Cambium ring, D Secondary xylem, E Secondary phloem, F Medullary rays
The given figure shows apical meristem of root apex with few part marked as A, B and C. Identify the correct labelling of A, B and C.
A Vascular structure, B Protoderm, C Root cap
A Cortex, B Endodermis, C Root cap
A Cortex, B Protoderm, C Root cap
A Tunica, B Protoderm, C Root cap
Cambium is considered as a lateral meristem because
it gives rise to lateral branches.
it causes increase in girth.
it increases height and diameter of a plant.
it adds bulk to a plant.
One of the primary function of the ground tissue in a plant is
photosynthesis.
to protect the plant.
to anchor the plant.
water and sugar conduction.
The given diagrams show stomatal apparatus in dicots and monocots. Which one is correct option for A, B and C?
A Epidermal cells; B Subsidiary cells; C chloroplast
A Guard cells; B Subsidiary cells; C Stomatal pore
A Guard cells; B Epidermal cells; C Guard cells
A Epidermal cells; B Subsidiary cells; C Guard cells
An organised and differentiated cellular structure having cytoplasm but no nucleus is called _________.
vessels
xylem parenchyma
sieve tubes
tracheids
Which one of the following statement is incorrect ?
- Epidermal cell has small amount of cytoplasm and a large vacuole.
- Waxy cuticle layer is absent in roots.
- Root hairs are unicellular, while stem hairs / trichomes are multicellular.
- Trichomes may be branched or unbranched, soft or stiff and prevent transpiration.
- Guard cells are dumbell shaped in dicots and beanshaped in monocots (e.g. grass).
Only (i)
Only (iv)
Only (iii)
Only (v)
Tissue(s) present in an annual ring is/are
secondary xylem and phloem.
primary xylem and phloem.
secondary xylem only.
primary phloem and secondary xylem.
Match the followings and choose the correct option
| Column-I | Column-II |
|---|---|
| A. Cuticle | I. Guard cells |
| B. Bulliform cells | II. Outer layer |
| C. Stomata | III. Waxy layer |
| D. Epidermis | IV. Empty colourless cell |
A III, B IV, C I, D II
A I, B II, C III, D IV
A III, B II, C IV, D I
A III, B II, C I, D IV
A piece of wood having no vessels (trachea) must be belonged to
teak
mango
pine
palm