Pith cavity occurs in the stem of ?
(a) Helianthus (b) Zea mays
(c) Cucurbita (d) 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.
A. Bulliform cells
B. Guard cells
2. Aerating pore
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?
(a) primary meristem
(b) secondary meristem
(c) intercalary meristem
(d) apical meristem
Glycolate induces opening of stomata in
(a) Presence of oxygen
(b) Low concentration
(c) High concentration
(d) Absence of
Two adjacent vessel and tracheid exchange sap through
A. Perforated end walls
C. Intercellular spaces
D. Intracellular spaces and parenchyma
Which one of the following comprises only simple tissue?
A. Parenchyma, Collenchyma and Sclerenchyma
B. Parenchyma, Xylem and Collenchyma
C. Parenchyma, Xylem and Sclerenchyma
D. 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?
A. It is retained in the centre of the axis
B. It gets crushed
C. May or may not get crushed
D. It gets surrounded by primary phloem
Which one of the following cell types always give rise to secondary cortex?
A. fusiform initial cells
B, root cap