The following figure is a model of seedling establishment as a function of distance from a parent tree. Initial seed density measures the number of seeds falling to the ground. Seed survivorship measures the proportion of seeds that survive to the adult stage at each distance

This model predicts that recruitment of new individuals into the population should be

TLS Online TPP Program

#Question id: 12203

#Unit 6. System Physiology – Plant

Which factor function as auxin co-receptors, with auxin acting as a “molecular glue”?

TLS Online TPP Program

#Question id: 12204

#Unit 6. System Physiology – Plant

Feedback regulation represents another key mechanism employed to attenuate a response such as

a) AUX/IAA proteins can bind to the promoters of their own genes and repress their own expression

b) auxin signaling triggers the degradation of AUX/IAA repressors, the ensuing transcription of auxin response genes leads to the replacement of AUX/IAA proteins and thus to response attenuation or termination

c) AUX/IAA genes, which encode the AUX/IAA auxin repressor proteins, have auxin response element binding sites located in their promoter regions

During the feedback regulation mechanism of auxin several responses are trigger, find out the correct sequences of these responses.

TLS Online TPP Program

#Question id: 12391

#Unit 6. System Physiology – Plant

Which of the following processed are involve in cell enlargement in plant?

a) Osmotic uptake of water across the plasma membrane is driven by the gradient in water potential (∆Yw)

b) Turgor pressure builds up because of the rigidity of the cell wall

c) Biochemical wall loosening occurs, allowing the cell to expand in response to turgor pressure

TLS Online TPP Program

#Question id: 12392

#Unit 6. System Physiology – Plant

 According to the acid growth hypothesis, the source of the hydrogen ions is the plasma membrane H+-ATPase, whose activity is thought to increase in response to

TLS Online TPP Program

#Question id: 12393

#Unit 6. System Physiology – Plant

According to the widely accepted acid growth hypothesis, allows some main predictions except;

TLS Online TPP Program

#Question id: 12394

#Unit 6. System Physiology – Plant

 Which one of the following fungal phytotoxin, stimulates both rapid proton extrusion and transient growth in stem and coleoptile sections?