Velamen is a specialized tissue found in
aerial roots of orchids
succulent leaves
pneumatophores
stilt roots
A.
aerial roots of orchids
Velamen is a dead spongy tissue present in epiphytic roots or hygroscopic roots. These roots are able to absorb water from moist atmosphere, dew and rain.
Select the characters which are not applicable to the anatomy of dicot roots?
(A) Conjunctive tissue present
(B) Presence of protein compounds in the Casparian strips
(C) Polyarch xylem bundles
(D) Presence of pericycle
(A) and (B)
(B) and (D)
(C) and (D)
(A) and (D)
(A) and (D)
Assertion : Monocot stem bears collateral open vascular bundles.
Reason : If cambium is absent such vascular bundles are called closed type.
If both Assertion and Reason are true and Reason is the correct explantion of Assertion
If both Assertion and Reason are true and Reason is not the correct explanation of Assertion
If Assertion is true but Reason is false
If Assertion is false but Reason is true.
Lenticels are involved in
Photosynthesis
Food transport
Conduction of water
Transpiration
Transpiration
Which of the following meristems are lateral meristems ?
Apical meristem, interfacsicular cambium and cork cambium
Fascicular vascular cambium, interfacsicular cambium and cork cambium
Apical mertistem, intercalary meristem and cork cambium
Intercalary meristem, interfacsicular cambium and cork cambium
Intercalary meristem, interfacsicular cambium and cork cambium
Which of these characters does/do not apply to the vascular bundle of monocot stem?
I. Conjoint
II. Endarch protoxylem
III. Open
IV. Phloem parenchyma is absent
I and II only
II and III only
III and IV only
III only
III only
When one wood is lighter in colour with a lower density, the other wood is darker with higher density. They are
Spring wood and autumn wood
Heart wood and late wood
Spring wood and early wood
Sap wood and spring wood
Sap wood and spring wood
Match the following.
| Column I | Column II |
| A. Collenchyma | 1. Specialized epidermal cells |
| B. Subsidiary cells | 2. Mechanical support for growing plants |
| C. Casparian strips | 3. Mesophyll tissue of dicot leaf |
| D. Spongy parenchyma | 4. Suberin deposition in the radial walls of endodermis |
A - 2; B - 1; C - 4; D - 3
A - 2; B - 3; C - 4; D - 1
A - 1; B - 2; C - 3; D - 4
A - 4; B - 1; C - 2; D - 3
A - 4; B - 1; C - 2; D - 3
Which of the following characters are not applicable to the anatomy of dicot stem and choose the correct options given below.
(A) Collenchymatous hypodermis
(B) Polyarch xylem
(C) Presence of casparian strips on the endodermis
(D) Open vascular bundle
(E) Presence of medullary rays
(A), (D) and (E) only
(B) and (C) only
(B) and (E) only
(A), (B) and (C) only
(A), (B) and (C) only
