Plant Anatomy Secondary Growth(A) (NEET/AIIMS Online Practice Exam)

Which will decay faster if exposed freely to the air :-
1. Heart wood
2. Sap wood
3. Wood with lots of fibres
4. Soft wood
Phelloderm is formed from :-
1. Vascular cambium
2. Phellogen
3. Fascicular cambium
4. Interfascicular cambium
Abnormal secondary growth is observed in :-
1. Dracaena
2. Wheat
3. Ginger
4. Rice
Heart wood of most of the woody trees, fails to conduct sap due to the obstruction by ?
1. Excess secondary wall deposition
2. Storing a variety of material by tyloses
3. Deposition of reserved food material
4. None of the above
Dendrochronology is the study of :-
1. Height of a tree
2. Diameter of a tree
3. Age of a tree with the help of annual rings
4. Counting of the number of branches
A timber merchant told his customer that log of wood which he was purchasing comes from a 20 years old tree, he told so by inspecting the :-
1. Diameter of log
2. Thickness of the heart wood
3. Number of cork layers
4. Annual rings
Commercial cork is obtained from :-
1. Juglans regia
2. Betula alba
3. Hevea brasiliensis
4. Quercus suber
Annual rings are well demarcated in trees growing in :-
1. Shimla
2. Bombay / Delhi
3. Madras.
4. Udaipur
The trees growing in deserts will :-
1. Show alternate rings of xylem and sclerenchyma
2. Show distinct annual rings
3. Not show distinct annual rings
4. Have only conjunctive tissue and pholem formed by the activity of cambium
Protective layer found at the site of abscission is :-
1. Parenchymatous
2. Collenchymatous
3. Sclerenchymatous
4. Suberized
In trees, the annual rings represent :-
1. Primary xylem
2. Secondary xylem
3. Secondary phloem
4. Cambium
Annual rings are the bands of :-
1. Secondary cortex and cork
2. All secondary vascular tissue
3. Secondary xylem and xylem rays
4. Secondary phloem and medullary rays
Annual rings and growth rings are formed due to the fluctuations in the activity of :-
1. Xylem
2. Phloem
3. Xylem and phloem
4. Cambium
Growth rings are formed due to the activity of :-
1. Intrastelar cambium
2. Intercalary cambium
3. Extrastelar cambium
4. Primary cambium
Knots are formed in the wood due to :-
1. External injuries
2. Bases of the branches get buried in main stem
3. leaf scars
4. Insect bites
When a tree grows older which of the following increased rapidly :-
1. Heart wood
2. Sap wood
3. Pith
4. Cortex
Sap wood differ from heart wood in being :-
1. Darker and non conducting
2. Softer and non conducting
3. Lighter and conducting
4. Harder, darker and less conducting
Sap wood is :-
1. Inner part of secondary phloem
2. Outer part of secondary phloem
3. Both "Inner part of secondary phloem" & "Outer part of secondary phloem"
4. None of these
In which of the following there is no differntiation between heart wood and sap wood :-
1. Neem
2. Ashok
3. Mango
4. Palm
Lenticels do not occur on :-
1. Stem
2. Root
3. Leaf
4. Fruit
External Protective tissues are :-
1. Cortex and epidermis
2. Cork and pericycle
3. Cortex and pericycle
4. Cork and epidermis
If a stem is girdled :-
1. Root dies first
2. Shoot dies first
3. Both die together
4. None of the above die
Which would do maximum harm to a tree :-
1. Loss of half of its leaves
2. Loss of half of its branches
3. Loss of all of its leaves
4. Loss of all its bark
Spring wood (early wood) differs with autumn wood (late wood) in :-
1. Size of vessels and tracheids
2. Thickness of cell wall
3. Amount of wood
4. All the above
Most conspicuous annual rings are formed in :-
1. Temperate evergreen plants
2. Tropical deciduous
3. Temperate deciduous plants
4. Tropical evergreen
Formation of vascular rays occurs in which order :-
1. Centripetal
2. Centrifugal
3. Basipetal order
4. Both " Centripetal " & " Centrifugal "
Which of the following provide maximum mechanical strength to a tree trunk :-
1. Heart wood
2. Sap wood
3. Cork
4. Late wood
Youngest layer of secondary xylem is located :-
1. In the centre of stem
2. Just outside the pith
3. Just outside the vascular cambium
4. Just inside the vascular cambium
Extra stelar secondary growth occurs due to the activity of :-
1. Intrafascicular cambium
2. Interfascicular cambium
3. Vascular cambium
4. Cork cambium
Bottle cork is obtained from :-
1. Betula vulgaris
2. Eucalyptus
3. Calotropis procera
4. Quercus suber
Inner bark is mainly composed of :-
1. Secondary xylem
2. Secondary phloem
3. Cork
4. Phellogen
Living tissue in lenticel is called :-
1. Conjunctive tissue
2. Connective tissue
3. Complementary tissue
4. Phelloderm
Stem of date palm increases in girth due to activity of :-
1. Intercalary meristem
2. Apical meristem
3. Lateral meristem
4. None of the above
Normally secondary growth takes place in :-
1. Dicots & Monocots
2. Gymnosperms & Monocots
3. Dicots & Gymnosperms
4. Only in dicots
Select true statements :-
(a) Lenticels are absent in woody climbers
(b) Lenticels occur in most woody trees
(c) The spring wood is lighter in colour and has a lower density
(d) The sap wood also called as duramen
1. a, b and c are correct
2. a and b are correct
3. b and d are correct
4. a and c are correct
Formation of secondary xylem and secondary phloem respectively :-
1. Centrifugal and centripetal
2. Centripetal and centrifugal
3. Both centripetal
4. Both centrifugal
A wood with scattered parenchyma is called :-
1. Paratracheal
2. Apotracheal
3. Syntracheal
4. None
In dicot root which tissue becomes dead due to activity of phellogen :-
1. All tissue outside cortex
2. Tissue outside hypodermis
3. Tissue outside endodermis
4. Tissue outside pericycle
In a hollow hearted stem, what is most affected :-
1. Conduction of food
2. Conduction of water
3. Storage of food
4. None of the above
Formation of which tissue is example of dedifferentiation :-
1. Interfascicular cambium
2. Apical meristem
3. Intrafascicular cambium
4. Intercalary meristem
In which stem, lateral meristem is absent :-
1. Palm
2. Bougainvillea
3. Boerhaavia
4. Mirabilis
Abnormal secondary growth occurs in :-
1. Cucurbita
2. Sunflower
3. Hordeum
4. Dracaena
In dicot stem cork cambium is first derived from :-
1. Outer cortex
2. Phellogen
3. Phelloderm
4. Pericycle
What happens to primary phloem in stem after sec growth :-
1. Compresses outside and degenerates
2. Compresses inside and degenerates
3. Becomes part of sec phloem
4. Modifies in sclerenchyma
Which tissue remains more active during autumn :-
1. Vascular cambium
2. Cork cambium
3. Parenchyma
4. Sclerenchyma
Water conduction in stem of tree takes place mainly by :-
1. Duramen
2. Sapwood
3. Primary xylem
4. All of the above
Water conduction in stem of tree takes place mainly by :-
1. Duramen
2. Sapwood
3. Primary xylem
4. All of the above
Study of wood is called :-
1. Anatomy
2. Morphology
3. Histology
4. Xylotomy
How many types of cells are present in vascular cambium :-
1. Two types, fusiform & ray initial
2. Only fusiform initial
3. Only ray initial
4. Three types fusiform, ray and medullary rays.
Annual ring involves :-
1. Early wood + Late wood
2. Heart wood
3. Sapwood
4. None

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Plant Anatomy Secondary Growth(A) (NEET/AIIMS Online Practice Exam)

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