Tyloses are balloon-like outgrowths in the lumen of secondary xylem tracheids and vessel of duramen region. These are actually:-
(1) outgrowth of vessels of xylem
(2) ingrowth of vessels
(3) outgrowth of parenchymatous cell
(4) swelling of xylem fibres for no function
Pith cavity occurs in the stem of ?
(1) Helianthus
(2) Zea mays
(3) Cucurbita
(4) Dracaena
Which of the following statement is true ?
1. Vessels are unicellular and with narrow lumen
2. Vessels are multicellular and with wide lumen
3. Tracheids are unicellular and with wide lumen
4. Tracheids are multicellular and with narrow lumen
Match the Column I and II.
Column I |
Column II |
A. Bulliform cells |
1. Stomata |
B. Guard cells |
2. Aerating pore |
C. Lenticels |
3. Accessory cells |
D. Subsidiary cell |
4. Isobilateral cells |
A B C D
(a) 1 2 3 4
(b) 3 1 2 4
(c) 4 1 2 3
(d) 4 3 2 1
Root cambium is derived from?
(1) primary meristem
(2) secondary meristem
(3) intercalary meristem
(4) apical meristem
Glycolate induces opening of stomata in
(1) Presence of oxygen
(2) Low concentration
(3) High concentration
(4) Absence of
Which one of the following comprises only simple tissue?
1. Parenchyma, Collenchyma and Sclerenchyma
2. Parenchyma, Xylem and Collenchyma
3. Parenchyma, Xylem and Sclerenchyma
4. Parenchyma, Xylem and Phloem
Match the following
A. | Meristem | i. | Photosynthesis, storage |
B. | Parenchyma | ii. | mechanical support |
C. | Collenchyma | iii. | Actively dividing cells |
D. | Sclerenchyma | iv. | stomata |
E. | Epidermal tissue | v. | Sclereids |
A. A-i, B-iii, C-v, D-ii, E-iv
B. A-iii, B-i, C-ii, D-v, E-iv
C. A-ii, B-iv, C-v, D-i, E-iii
D. A-v, B-iv, C-iii, D-ii, E-i
What is the destiny of primary xylem in a dicot root showing extensive secondary growth?
1. It is retained in the centre of the axis
2 It gets crushed
3. May or may not get crushed
4. It gets surrounded by primary phloem
While removing the skin of a potato tuber, we remove
A. Periderm
B. Epidermis
C. Cuticle
D. Sapwood