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
B.
Downy mildew of grapes
Bordeaux mixture was discovered by Millardet in France in 1882. It is prepared by dissolving 40 g of copper sulphate and 40 g of calcium hydroxide in 5 L of water. It was first used to control downy mildew disease of grape-vine that is caused by a fungus Plasmopara viticola. Black rust of wheat is caused by Puccinia graminis Tritici. The use of fungicide Dithane Z- 78 and Dithane M- 45 control the disease even at a lower concentration.
Loose smut of wheat is caused by Ustilago tritici. The use of fungicides (systemic fungicide like D- 735 and F- 461)give the quite encouraging result.
Dry indehiscent single-seeded fruit formed from bicarpellary syncarpous inferior ovary is
Caryopsis
cypsela
Adiantum
Adiantum
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
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
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
The fleshy receptacle of syconus of fig encloses a number of
achenes
samaras
berries
berries
The blood calcium level is lowered by the deficiency of
parathormone
thyroxine
calcitonin
calcitonin
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 |
