Lenticels are pores found in the bark of woody stems. What is their primary function?
Water transport
Nutrient absorption
Gas exchange
Protection against herbivores
Related Questions
All of the following are component of bark except?
Cork
Secondary cortex
Secondary xylem
Secondary phloem
Continuous ring of cambium is formed by
Intrafascicular cambium
Interfascicular cambium
Lateral meristem
Both (a) and (b)
Study the following statements
I. Increase in girth of plants is primary growth
II. Increase in girth of plants occurs due to apical meristem
III. Secondary growth of plants occurs due to lateral meristem
IV. Vascular cambium and cork cambium are the lateral meristem of plants
V. Elongation of a plant along the axis is called primary growth
Choose the incorrect options
I and II
III and IV
IV and V
I and V
The activity of the vascular cambium leads to an increase in the:
Length of the stem or root
Number of leaves
Girth of the stem or root
Number of root hairs
I. During secondary growth, a complete ring is formed by vascular cambium
II. Interfascicular cambium originates from medullary ray cells
III. Vascular cambium form xylem on the inside and phloem on the outside due to differential action of hormones
Select the correct combination of option
I and II
II and III
I and III
I, II and III
Which of these would likely NOT exhibit significant increases in stem diameter due to secondary growth?
Herbaceous plants
Woody shrubs
Trees
Conifers
Which of the following tissues are NOT produced by the vascular cambium?
Secondary xylem
Secondary phloem
Pith rays
Wood
What causes the variation in the appearance of wood within annual rings?
Consistent cambial activity throughout the year
Variations in soil nutrient levels
Differential cambial activity throughout the year
Changes in atmospheric pressure
I. Youngest secondary phloem is just outside the cambium, while youngest secondary xylem is present inside the cambium
II. Oldest secondary phloem is just inside the primary phloem, while oldest secondary xylem is just above pith
III. Secondary medullary ray passes through both secondary xylem and secondary phloem
Select the incorrect statement from above
I
II
III
I and III
Function of xylem ray parenchyma is
upward conduction
Radial conduction
Downward conduction
1 and 3