The length of different internodes in a culm of sugarcane is variable because of
shoot apical meristem
position of axillary buds
size of leaf lamina at the node below each internode
size of leaf lamina at the node below each internode
D.
size of leaf lamina at the node below each internode
Intercalary meristem is prsent away from apical meristem in primary permanent tissue. It is present at the base of internodes, eg, in family-Gramineae or at the base of leaves, eg, Pinus or at the base of the node, eg, Mentha. Intercalary meristem is responsible for the increase in length.
The shoot apical meristem present at the apices of the shoot is self-determining and autonomous organising centre. The primary growth and differentiation of primary tissue are entirely due to this meristem as it continuously divides giving rise to new cells. These are the apical meristems that increase the length of the plant but not internodes variability.
The rupture and fractionation do not usually occur in the water column in vessel/tracheids during the ascent of sap because of
lignified thick walls
cohesion and adhesion
weak gravitational pull
weak gravitational pull
The blood calcium level is lowered by the deficiency of
parathormone
thyroxine
calcitonin
calcitonin
Which one of the following is linked to the discovery of Bordeaux mixture as a popular fungicide?
Bacterial leaf blight of rice
Downy mildew of grapes
Loose smut of wheat
Loose smut of wheat
The fleshy receptacle of syconus of fig encloses a number of
achenes
samaras
berries
berries
Which one of the followings in birds, indicates their reptilian ancestry?
Scales on their hind limbs
Four chambered heart
Two special chambers crop and gizzard in their digestive tract
Dry indehiscent single-seeded fruit formed from bicarpellary syncarpous inferior ovary is
Caryopsis
cypsela
Adiantum
Adiantum
Which one of the following is the correct difference between rod cells and cone cells of our retina?
|
Features |
Rod cells |
Cone cells |
|
Visual acuity |
High |
Low |
|
Features |
Rod cells |
Cone cells |
|
Visual Pigment contained |
Iodeosin |
Rhodopsin |
|
Features |
Rod cells |
Cone cells |
|
Overall function |
Vision in poor light |
Colour vision and detailed vision in bright light |
|
Features |
Rod cells |
Cone cells |
|
Overall function |
Vision in poor light |
Colour vision and detailed vision in bright light |
