121. Who created a landmark in plant tissue culture research?
A. Vasil.
B. Hildebrandt.
C. Schenk.
D. Skoog and Murashige.
ANSWER: D
122. An excised piece of differentiated tissue or organ is termed as ______.
A. callus.
B. embryogenic tissue.
C. explant.
D. protoplast
ANSWER: C
123. The ability of an individual cell, even a protoplast to develop into whole plant is ______.
A. callus.
B. dedifferentiation.
C. redifferentiation.
D. totipotency.
ANSWER: D
124. The concept of in vitro cell culture is reported by ______.
A. Vasil.
B. Hildebrandt.
C. Schenk.
D. Haberlandt.
ANSWER: D
125. Which scientists first develop anther and pollen culture for production of haploid plants?
A. Riker
B. Hildebrandt.
C. Stewart and Reinert.
D. Maheswari and Guha.
ANSWER: D
126. Which cultures serve as good targets for mutation and selection of desirable mutants?
A. Protoplast.
B. Cell.
C. Anther.
D. Pollen.
ANSWER: B
127. Which enzyme can degrade middle lamella, cell wall of plant cells?
A. Zymogen.
B. Cellulases.
C. Macerozyme.
D. Pectinase.
ANSWER: C
128. The cell suspension culture grown in fixed volume of nutrient culture medium is termed as ______ culture.
A. batch.
B. continuous.
C. callus.
D. suspension.
ANSWER: A
129. The cellular growth rate and density is constant in _____ type of continuous cultures.
A. chemostat.
B. turbidostat.
C. closed.
D. batch.
ANSWER: A
130. The addition of fresh medium is done whenever there is an increase in turbidity is termed as ______.
A. chemostat
B. turbidostat.
C. equilibrium state.
D. isotonic state.
ANSWER: B
