Why do plants growing outside often have shorter and thicker stems than plants of the same species grown indoors?
A. The outdoor plants are subject to touch by animals and other plants and are exhibiting a thigmotropic response.
B. The plants inside have a more constant source of light and therefore a higher level of phytochrome.
C. The outdoor plants are subject to mechanical stresses and they are exhibiting a thigmomorphogenic response.
D. The indoor plants have elevated levels of auxin and are therefore taller than the outside plants.
Answer: C
You might also like to view...
An animal that does NOT maintain a relatively constant internal water concentration as the osmolarity of its environment varies is termed an
A. osmoconformer. B. osmoregulator. C. isoconformer. D. isoregulator. E. hydroconformer.
Untreated gonorrhea in males may lead to
A. sterility. B. urinary tract infections. C. prostatic abscesses. D. orchitis. E. All of the choices are correct.
In cocker spaniels, black coat color (B) is dominant over red (b), and solid color (S) is dominant over
spotted (s). If two dihybrids (Bb Ss) were crossed, what fraction of the black, solid offspring would be homozygous? a. 4/16 b. 9/16 c. 1/9 d. 3/16 e. 3/4
The primary function of the corpus luteum is to _____
A) nourish and protect the egg cell B) maintain progesterone and estrogen synthesis after ovulation has occurred C) stimulate the development of the mammary glands D) support pregnancy in the second and third trimesters