Many plants form callus tissues from the inoculation of different colonies of mutant bacteria. The calli are grown on in tissue culture. List the changes occurring during hormone induced senescence in plants. You might choose fruit ripening as an example of this process. Onion plants form bulbs under photoperiodic control.
Onions are long-day plants in terms of bulb formation.
Sweet Spanish onions need days longer than 12 hours to induce bulb formation. Your colleague in Texas has no trouble growing beautiful Bermuda onions, but cannot grow any decent Sweet Spanish onions in his fields despite planting at different times in the year. You find that Bermuda onions only make tiny bulbs in Connecticut regardless of the planting time. Go back to the Course Schedule . Go back to the Exam Directory .