3. Protease inhibitors can be produced by the jasmonic acid pathway in healthy p

Question

3. Protease inhibitors can be produced by the jasmonic acid pathway in healthy plant cells in response to a. physical damage of adjacent cells as indicated by the release of systemin from those cells. b. gibberellic acid release from the aleurone layer e. auxin secretion from apical meristem tissues and from healthy leaves. d. ethylene release from the abscission zone. 4. In the auxin-mediated elongation response seen in plant cells, protons pumped to the outside of the cell a. decrease the pH of the cell cytoplasm, which causes ions to flow out of the cell in exchange for b. power molecular water pumps that increase the byrdostatic pressure of the cell and casuseit to act to: water swell c. pull water molecules into the plant cell through proton-water cotransporters. d. create a flow of ions like potassium into the cell, which reduces the solute potential of the cell. 5. A fundamental difference between germination in eudicots versus germination in monocots is whether a. cotyledons develop before the radicle or after the radicle. cotyledons are formed of embryonic tissue or formed of endoderm. seed completely encloses the cotyledons or the cotyledons remain partially outside the seed. d. cotyledons remain below ground or come above ground.

Explanation / Answer

Answer to Que 3: Option d. ethylene release from the abscission zone

Explanation: Fruit ripening and their fall, dropping of leaves due to senescence is taken as the wound signalling by the plant. Ethylene and Jasmonic acid are simultaneously released from the abscission zone activates the proteinase inhibior gene expression and responsible for the synthesis of Proteinase inhibitors (Given as protease inhibitors in the question which may be printing mistake, because protease inhibitors like Ritonavir, lopinavir, darunavir are antiviral drugs intended for viral treatments and not related to plants)

Option a. states that physical damage of adjacent cells as indicated by the release of systemin from those cells which is not true because, in the question it was asked about the proteinase inhibitors synthesis in healthy cells. Systemin is released in response to wound and not in healthy cells

Option b states that gibberellic acid release from the aleurone layer which is also not correct because, gibberlic acid is does not play a vital role in proteinase inhibitors synthesis

Option c states that auxin secretion from apical meristem tissues and from healthy leaves is also not correct because auxins have negative effect on jasmonic acid pathway and proteinase inhibitors synthesis

Answer to Que 4: Option d. create a flow of ions like potassium into the cell which reduces the solute potential of the cell

Explanation: Auxins results in movement of potassium ions into the cell, there is a drop in pH, cell wall weakening and reduced solute potential as well as activation of expansin which leads to elongation

Option a states that decrease the pH of the cell cytoplasm, which causes ions to flow out of the cell in exchange for water is false since Potassium ions moves into the cell but not out of the cell

Option b. states that power molecular water pumps that increase the hydrostatic pressure of the cell and cause it to swell is not true because, during the cell elongation cell wall loosens, turgor pressure is increased allowing the microfibrils to slide and do not swell

Option c. states that pull water molecules into the plant cell through proton water co-transporters is also wrong as seen from the above discussion

Answer to Que 5: Option c. the seed completely encloses the cotyledons or the cotyledons remain partially outside the seed

Explanation: Enclosure of cotyledons in the monocots and eudicots is the main differentiating factor. Monocots have completely enclosed seed eudicots have cotyledons partially outside the seed

Option a. states that cotyledons develop before the radicle or after the radicle is not correct because imbibition and radicle emerges first in both monocots and eudicots

Option b. states that cotyledons are formed of embryonic tissue or formed of endoderm is also not true as there are few exception as seen in case of castor bean. Monocot seeds contain endosperm

Option d. states that cotyledons remain below ground or come above ground is not correct because, cotyledons come above the ground in dicotyledons and are again driven back into the soil. So, this is also not a fundamental difference

Related Questions

Navigate

• Browse (All)
• Browse 3
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.