Biology Mcqs

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.

An increrase in plant girth due to activity of _____________ is called secondary growth?

A. Cork cambium
B. Pith.
C. Vascular cambium.
D. Both a and c

Which of the following statement about osteoporosis is incorrect.

A. It results from estrogen deficiency.
B. Bone eating process takes over bone formation process.
C. There is reduction of bone mass and change in chemical composition of the matrix
D. It is common in old age.

Among the followings which is the most longest supportive cell?

A. Tracheids
B. Sclereids
C. Trachea
D. Collenchyma cells

Which of the follwing is a childhood disease resulting from nutritive Ca2+ deficiency?

A. Hypocalcaemia Tatanic spasms.
B. Osteomalacis.
C. Rickets.
D. Tetany

Secondary cell wall of sclerenchyma cells is impregnated with_________________?

A. Cellulose.
B. Peptidoglycan and murein.
C. Lignin.
D. Pectin.

Which of the following hormone is predominantly responsible for bone weakening in older women?

A. Progesterone.
B. Oestrogen.
C. Parathyroid hormone.
D. Calcitonin.

In which of the following joint muscles are arranged in the same plane as that of joint?

A. Between radius and ulna.
B. Between ulna and scapula
C. Between humerus and scapula
D. Between femur and tibia.