Multiple Choice QuestionsWhich 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
C.
Two special chambers crop and gizzard in their digestive tract
Nearly a century ago, T H Huxley called birds 'glorified reptiles' thereby meaning that birds have evolved from some reptilian ancestor. Both birds and reptiles lay the same type of eggs, which are deposited outside water. Eggs are large and telolecithal. The ovum is surrounded by albumen, an egg membrane and a thick hard calcareous shell, which are all secreted by special glands located in the walls of the oviduct.
Birds like mammals have a completely four-chambered heart with double circulation, in which there is no mixing of pure and impure blood., All birds have horny epidermal scales confined to the lower parts of their legs and feet, which are exactly like the epidermal scales of the reptiles. Besides birds are covered by feathers, which are homologous to the reptilian horny scales as they have a similar origin and develop from similar germ buds.
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
Dry indehiscent single-seeded fruit formed from bicarpellary syncarpous inferior ovary is
Caryopsis
cypsela
Adiantum
Adiantum
The fleshy receptacle of syconus of fig encloses a number of
achenes
samaras
berries
berries
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 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
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 |
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