Vascular Cambium initially appears as actively dividing cells between_________________?
(A) Primary Xylem and secondary xylem.
(B) Primary xylem and secondary phloem.
(C) Primary xylem and primary phloem
(D) Secondary xylem and secondary phloem.
If two ends of fractured bone are opened and kept united via screws and wires drilled in bone substance. This step in fracture repair is called___________?
(A) Open reduction.
(B) Closed Fixation.
(C) Open fixation.
(D) Immobilization
Which of the following statements about fractures in old age is incorrect?
(A) They are more common than in adult age.
(B) Occur as a result of bone being thin and weak.
(C) Due to good blood supply it results in quick healing.
(D) It involves osteoblasts and osteocytes.
In an annelids, the contraction of circular muscle results in___________?
(A) Lengthening of the body.
(B) Shortening of the body.
(C) Widening of body
(D) Thinning of body
Which of the following animal has a hydrostatic skeleton?
(A) Earthworm
(B) Round worm
(C) Tape worm
(D) Pin worm
A smallest contractile unit of muscle contraction called sarcomere is the area between two:
(A) H- zone
(B) M- Line
(C) Z- Line
(D) A band
Gibberellins is an example of_________________?
(A) Growth inhibitor
(B) Growth stimulator
(C) Growth hormone
(D) None of these
Which of the following statements is incorrect about skeletal muscle fibers?
(A) They are multinucleated.
(B) They are 10 – 100 ?m in diameter & surrounded by sarcolemma
(C) They contain O2 storing molecules called hemoglobin.
(D) Their cytoplasm contains high concentration of carbohydrates