#Question id: 11745
#Unit 6. System Physiology – Plant
sieve cells of the sieve elements of phloem conduct sugars throughout the plant. The following statements given about characteistics of Sieve cells of sieve elements in seed plants;
a.) There is no P-protein in gymnosperms
b.) Angiosperm contains sieve plate pores are open channels
c.) Pores in sieve areas appear blocked with membranes in gymnosperms
d.) Companion cells are sources of ATP and perhaps other compounds
Which of the following combination is correct?
#Question id: 11746
#Unit 6. System Physiology – Plant
Sieve element sap is rich in sugars and other organic molecules, These molecules represent an energy investment for the plant. How their loss be prevented when sieve elements are damaged?
#Question id: 11747
#Unit 6. System Physiology – Plant
A mechanism for preventing sap loss entails closing sieve plate pores with callose, which is
#Question id: 11748
#Unit 6. System Physiology – Plant
In mature cells, P-protein occurs in several different forms depending on the species. Such as;
#Question id: 11802
#Unit 6. System Physiology – Plant
Damaged sieve elements are sealed off, but because of the processs that plug sieve plates pores, excuded phloem sap from wounds that sever sieve elements. Exudation of sap enhanced by the inclusion of;
#Question id: 11803
#Unit 6. System Physiology – Plant
Due to damage exudation of sap from cut petioles or stems takes place they can be collected. However, quantities of collected sap are small, and the method is technically difficult. A preferable approach for collecting exuded sap is to use an