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Effect of Temperature
Certain plants such as the winter rye (Secale cereale) and the biennial strain of henbane (Hyoscyamus Niger) require exposure to low temperature conditions before they start flowering. A phenomenon known as 'vernalization' or 'Yaronization' was noted by the Russian Plant physiologist Gustav Gussner in 1915. Here also embryo or shoot apex seems to be the site of perception and the role of a hormone 'Vernalin" is suggested. Unfortunately like florigen, vernalin has been still elusive. Gibberellin treatment is known to substitute for cold treatment.
Q. What are the events that mark the end and the beginning of the first interphase period? What happens inside the cell in this period? The initial interphase period is the G1.
ENZYMES IN CLINICAL DIAGNOSIS The rationale for measuring plasma or serum enzyme levels is based on the premise that these levels reflect changes that have occurred in a
What do numeric pyramids represent? Numeric pyramids show the number of individuals in each trophic level of a food chain.
For a particular assay, you require cells at a concentration of 300 cells per ml. In your flask of cells growing you counted a sample using a hemacytometer and found that you have
A cleavage furrow appears in the middle of the cell, deepens gradually and divides the cell into two. Thus, at the end of second meiotic division, four daughter cells are formed
The original DNA sequence when ,transcribed and translated would yield five successive valine residues. But the altered sequence would correspondingly read one aspartate and four s
EXCRETIO N IN FLATWORM - Main organs are flame cells, having bundle of cillia. It receives solute and water from surrounding tissue fluid by ultra filtration & discharge th
Q. What do energy pyramids represent? The Energy pyramids represent the amount of accessible energy in each trophic level of the food chain.
Aesthetic and Recreational Significance - Wildlife Many wild species are a source of beauty, wonder; joy, and recreational pleasure for large number of people. Observing leave
how the structure of ciliates facilitates their parasitism
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