The plant hormone that promotes cell division and is also used in tissue culture is:
A. Abscisic acid
B. Auxin
C. Cytokinin
D. Gibberellin
Answer: Option C
Solution (By JKSSB Mock Tests)
Cytokinins are plant hormones that promote cytokinesis (cell division) and shoot initiation. They are used in tissue culture along with auxins to induce organogenesis. Auxins promote cell elongation and root initiation, gibberellins stem elongation, abscisic acid stress responses and dormancy.
Explanation:
The diaphragm is a dome-shaped skeletal muscle that contracts during inspiration, flattening and increasing thoracic volume. The external intercostal muscles assist.
Explanation:
Formalin (37-40% formaldehyde solution) is a common fixative and preservative for biological specimens, preventing decay by cross-linking proteins. Alcohol is also used but formalin is standard. Acetone is a solvent, glycerin a humectant.
Explanation:
Hexokinase phosphorylates glucose to glucose-6-phosphate using ATP, the first step of glycolysis. Phosphofructokinase is the third step, pyruvate kinase the last, glucose-6-phosphatase reverses the reaction in gluconeogenesis.
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