12th Class Biology MCQS Coordination and Control

Biorhythms are called circadian which means about one day so they are also called

Diurnal tempo

Diurnal cadence

Diurnal rhythms

Diurnal pace

Who was the first to propose an objective definition of instincts in terms of animal behaviour

Wallace

Darwin

Lamarck

Lyell

The disorder in which bones are porous and thin but bone composition normal is:

Osteomalacia

Osteoporosis

Rickets

Arthritis

In myelinated neurons the impulse jumps from node to node (node of Ranvier) This is called

None of these

Myelinated impulse

Saltatory impulse

Jumping impulse

In skletal muscle, calcium facilitates contraction by binding to:

Actin

Troponin

Myosin

Tropomyosim

A cluster of neuron’s cell bodies form

Ganglia

Cyst

Lump

Swelling

Imprinting is best known in birds such as

All a,b,and c

Geese

Ducks

Chickens

Auxins promote growth of roots from

Layering

Calluses

Both a & b

Cutting

Abscisic acid can be sprayed on tee crops to regulate

Leaf drop

Fruit drop

Cone drop

Shoot drop

The remodeling of bone is a function of which cells?

Chondroblasts and osteoclasts

Chondroblasts and osteocytes

Osteoblasts and osteoclasts

Chondrocytes and asteocytes