A) cytochrome
B) phytochrome
C) chromatin
D) vernalin
Correct Answer: B
Solution :
The photomorphogenetic movement (photoperiodism) is the effect of photoperiods or daily duration of light hours on the growth and development of plants. Phytdchrome (amorphous, photoreceptor, chromoprotein) is involved in photoperiodism. Long and Malcher (1966) postulated that hormone called vernalin is produced on the meristematic shoot apex of the embryo due to vernalization treatment which, is responsible for inducing flowering. Chromatin is hereditary DNA protein fibrillar complex. Chromatin fibres are distributed throughout the nucleoplasm. They are differentiated into euchromatin and heterochromatin. Cytochromes are proteins with characteristic strong absorption of visible light, due to their iron containing here prosthatic groups. Mitochondria contain three classes of cytochromes designated as a, b and c, distinguished by differences in their light absorption spectra.
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