Following are certain statements are related to the effect of red and far-red light;

a) under a dense canopy much of the red light is absorbed by plant pigments, resulting in transmittance of mostly far-red light

b) Pr (red) has highest photon flux at 680 nm while Pfr (far-red) has highest photon flux at 730nm

c) Pfr far-red light–absorbing form, which is considered to be the physiologically active form of phytochrome

d) R:FR ratio is strongly affected by the presence of a canopy because chlorophyll absorbs far-red but not red light

Which one of the combinations of above statements is incorrect?

#Question id: 31415

#Unit 7. System Physiology – Animal

#Question id: 10877

#Unit 7. System Physiology – Animal

A 27-year-old man is breathing quietly. He then inhales as much air as possible and exhales as much air as he can, producing the spirogram shown in the previous figure. What is his expiratory reserve volume (in liters)? 

#Question id: 10878

#Unit 7. System Physiology – Animal

The resistance of the pulmonary tree is so low that a 1 cm of water pressure gradient is sufficient to cause normal air flow during resting conditions. Which of the following often has a substantial resistance during pulmonary disease states that can limit alveolar ventilation?

#Question id: 10879

#Unit 7. System Physiology – Animal

If the inspiratory reserve volume is 3000 mL, the tidal volume is 500 mL, the expiratory reserve volume is 1000 mL, and the residual volume is 1000 mL, what is the vital capacity?

#Question id: 11059

#Unit 7. System Physiology – Animal

A healthy, 45-year-old man is reading the newspaper. Which of the following muscles are used for quiet breathing?

#Question id: 11060

#Unit 7. System Physiology – Animal

A healthy, 25-year-old medical student participates in a 10-km charity run for the American Heart Association. Which of the following muscles does the student use (contract) during expiration?