91.

Porous wood has abundance of 

• vessels

• fibres only

• tracheids

• sieve tubes

Velamen is a specialized tissue found in

• aerial roots of orchids

• succulent leaves

• pneumatophores

• stilt roots

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.

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

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

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)

Lenticels are involved in

• Photosynthesis

• Food transport

• Conduction of water

• Transpiration

• Transpiration

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 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