Rapid movement of leaves of mimosa on touching is an example of _____________?

A. Turgor movement
B. Nastic movement
C. Tropic movements.
D. Growth movement

Sperms of liverworts, mosses, ferns move towards archegonia, in response to uncleic acid released by the ovum. This is an example of ____________?

A. Chemotropic movement
B. Chemotactic movement
C. Chemosastic movement
D. Haptonastic movement

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.

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

Among the followings which is the most longest supportive cell?

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

Secondary cell wall of sclerenchyma cells is impregnated with_________________?

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

Higher turgor pressure in a plant cell is maintained by________________?

A. Large number of vacoules in a plant cell.
B. Higher ionic concentration inside vacuoles resulting from active pumping of ions at their tonoplastic membrane
C. Higher osmotic pressure of the cell vacuole
D. Both b and c

Which of the following plays the major role in providing support to young herbaceous parts of the plant?

A. Living cells of epidermis with higher turgor pressure.
B. Living cells of cortex and pith with higher turgor pressure.
C. Collenchyma cells
D. All of these

Vocal cords are stretched across_______?

A. Larynx
B. Pharynx
C. Golttis
D. None of these

In most birds air sacs are ____________ in number?

A. 10
B. 3
C. 4
D. 9