Questions
Choose the incorrect statement.
- Epiphytic roots and Vanda has well developed root cap and root hair
- Tinospora and Trapa possess assimilatory roots
- Cuscuta is a parasitic plant
- Saccharum and Zea mays possess still toots
Hairy root disease of dicot plants is caused by
- Agrobacterium tumefaciens
- Agrobacterium rhizogene
- Bacillus thuringiensis
- Meloidogyne incognita
Clowes observed a central cup like region of passive cells in the root tip of Zea mays which lies in between?
- Root cap and active root meristem
- Protoderm and procambium
- Cork cambium and quiescent centre
- Quiescent centre and calyptrogen
Root cap is absent in
- Hydrophytes
- Lithophytes
- Xerophytes
- Mesophytes
The origin of root hairs and lateral roots is ___________________.
- Exogenous and endogenous respectively
- Endogenous and exogenous respectively
- Both endogenously
- Both exogenously
How many divisions must occur in a cell of root tip to form 128 cells ?
- 128
- 127
- 64
- 3
Rearrange the following series as seen in the rest in vertical section and choose the correct option:
(a) Rest hair zone (b) zone of meristem
(c) Rest cap zone (d) zone of maturation
(e) zone of elongation
- c, b, e, a, d
- a, b, c, d, e
- d, e, a, c, b
- e, d, c, b, a
Rearrange the following zones as seen in the root in vertical section and choose the correct options.
A. Root hair zone B. Zone of meristems
C. Root cap zone D. Zone of maturation
E. Zone of elongation
- C, B, E, A, D
- A, B, C, D, E
- D, E, A, C, B
- E, D, C, B, A
- dermatogen
- calyptrogen
- vascular cambium
- wound cambium
Statement 1: Root cap protects the root meristem from the friction of the soil and its outer cells are continuously replaced by never ones.
Statement 2: The effect of the soil-friction damages the outer cells of root cap which are peeled off and replaced by new cells produced by root meristem.
- Both statement 1 and 2 correct.
- Statement 1 is correct but statement 2 is incorrect.
- Statement 1 is incorrect but statement 2 is correct.
- Both statement 1 and 2 incorrect.
Read the given statements and select the correct ones.
(i) Root caps are present in prop roots.
(ii) Pneumatophores help to get oxygen for respiration
(iii) Edible part of ginger is underground stem.
(iv) Hydrophytes usually possess a well developed root system
- (i) and (ii) only
- (ii) and (iii) only
- (i), (ii) and (iii)
- (i), (ii), (iii) and (iv)
Root hair is always.
- Very long
- Multi cellular
- Cuticularized
- Unicellular
Choose the correct answer from the alternatives given.
Root nodules are formed from the cells of:
- epidermis
- cortex
- vascular cylinder
- pith
Choose the correct answer from the alternatives given.
Radial vascular bundles are found in:
- dicot root
- monocor root
- dicot stem
- both dicot and monocot roots