12th Class Biology MCQS
The simplest form of learning is
Latent learning
Habituation
Insight learning
Imprinting
The remodeling of bone is a function of which cells?
Chondroblasts and osteocytes
Chondroblasts and osteoclasts
Chondrocytes and asteocytes
Osteoblasts and osteoclasts
Antidiuretic hormone is also called
Vasopressin
ACTH
Oxytocin
Both a & b
The disorder in which bones are porous and thin but bone composition normal is:
Arthritis
Osteoporosis
Osteomalacia
Rickets
Who was the first to propose an objective definition of instincts in terms of animal behaviour
Darwin
Lamarck
Lyell
Wallace
Imprinting is best known in birds such as
Chickens
All a,b,and c
Ducks
Geese
Which of the following statements conserning the role of Ca+2 inthe contraction of skeletal muscle is correct?
The tension of a skeletal muscle fiber is partly regulated by G proteins muscle
Ca+2 entry across the plasma membrane is important in sustaining the contraction of skeletal muscle
A rise in inter cellular Ca+2 allows actin to interact with myosin
The mitochondria act as a store of Ca+2for the contractile process
Amphibians wriggle along the belly on the gound with the help of segmentally arranged
Scales
Muscles
Skin patches
Both a & b
A hurdened outer surface to which internal muscles can be attached is
Axial skeleton
Exoskeleton
Endoskeleton
Hydrostatic skeleton
Innate behaviour is a collection of responses that are predetermined by the
Inheritance
Birthright
Legacy
Heritage
At the distal end the femur forms knee joint with the proximal end of two parallel bones called
Tibia and fibula
Tarsal & metatarsal
Carpals & metacarpals
Radius & ulna
Each muscle fibre contains a large number of myofibrils having a diameter of
1 – 2 mm
2 – 4 mm
3 – 7 mm
1 – 5 mm
Myoglobin has a special function in muscle tissue:
It breaks down glycogen
It is a contractile protein
It holds a reserve supply of oxygen in the muscle
None of these
Which is the most important mechanism for water loss from the body?
Excretiong in urine
Eleminatin in feces
Sneezing
Sweating
Mammals including human maintain their high body temperature within a narrow range of about
32-36oC
35-37oC
36-38oC
30-32oC
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