Biology 2nd Year
MCQs
Chapter No.2
Support and Movement
11. The scale, iatous cells which are found in seed coats & nut shells are
- Phototropism
- Thigmotropism
- Chemotropism
- Geotropism
Answer:
Chemotropism
12. The vas ibium lies between
- Epidermis
- Cortex
- Pith
- Xylem
Answer:
Pith
13. Turgor pressure is generated mainly by osmotic pressure of Plant Movements
- Vascular cambium
- Cork cambium
- Vascular cambium & Cork cambium
- None of these
Answer:
Cork cambium
14. Which is not true for auxins?
- Vessels
- fibers
- sclereides
- trachieds
Answer:
Sclereides
15. Nastic movements are due to balance between
- Primary and secondary xylem
- Cork and phloem
- Primary Phloem and Secondary Xylem
- Secondary Phloem and Secondary Xylem
Answer:
Primary Phloem and Secondary Xylem
16. Which one of following is non-directional plant movement?
- Cell cytosol
- Cell vacuoles
- Cell cytosol & Cell vacuoles
- None of these
Answer:
Cell cytosol & Cell vacuoles
17. Which is not true for pulvinus
- Positive gravitropism of roots
- Negative gravitropism of Stem
- It is for hyponasty
- Causes bending in Oxygen
Answer:
Causes bending in Oxygen
18. The movement of part of plant in response to stimulus of light
- Auxins and cytokines
- Abscisic and auxins
- Gibberalin and abscisic
- Cytokines and gibberalin
Answer:
Auxins and cytokines
19. The movement in response to some chemical is called
- Paratonic movements
- Tropic movements
- Nastic movements
- All of these
Answer:
Nastic movements
20. Opening and closing of flowers due to light intensity is termed
- Haptonasty
- Thermonasty
- Photonasty
- Phototropic
Answer:
Photonasty