Seedlings grown in the dark display an etiolated growth pattern:

a) yellow unexpanded cotyledons

b) apical hook

c) Long hypocotyl

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#Id: 7992

#Unit 10. Ecological Principles

Excretory organs such as

a. Flame cells 

b. Nephridia 

c. Gills

d. Water vascular system

e. Kidneys  excrete these wastes.

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#Id: 6067

#Unit 10. Ecological Principles

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#Id: 9165

#Unit 11. Evolution and Behavior

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#Id: 5000

#Unit 6. System Physiology – Plant

In all photoperiodic plants,

In the winter when days are short, [P_R] > [P_FR]

In the summer when days are long, [P_R] < [P_FR]

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#Id: 9863

#Unit 6. System Physiology – Plant