1. The shade avoidance response is controlled by phytochrome, and when a sun pla
ID: 257569 • Letter: 1
Question
1. The shade avoidance response is controlled by phytochrome, and when a sun plant is shaded it will
Elongate its stems to grow as a spindly plant with few branches until it finds sufficient sunlight
Grow as a stocky bush to concentrate its leaves to trap whatever sunlight is available
It is unlikely to alter its growth habit
Stop growing altogether (i.e., go dormant) and wait for more favorable conditions
Alter its pigment composition to better utilize far red light for photosynthesis
Which statement is true regarding cell wall polysaccharides
Lignin is a (1à4)?-D-glucan chain with many side branches
Pectin is a (1à4)?-D-glucan chain with no side branches
Cellulose is a (1à4)?-D-glucan chain with many side branches
Cellulose is a (1à4)?-D-glucan chain with no side branches
Hemicellulose is a (1à4)?-D-glucan chain with no side branches
1)During signaling between a legume plant and a rhizobium bacteria, the signal from the bacteria is
A) Gibberellin
B) auxin and cytokin together
C) A flavonoid
D) midi-chlorians
E) lipochitooligosaccharides (shown right, also called “NOD” factors)
What characteristics will
Elongate its stems to grow as a spindly plant with few branches until it finds sufficient sunlight
Grow as a stocky bush to concentrate its leaves to trap whatever sunlight is available
It is unlikely to alter its growth habit
Stop growing altogether (i.e., go dormant) and wait for more favorable conditions
Alter its pigment composition to better utilize far red light for photosynthesis
Explanation / Answer
Answer 1. The correct option is Option 1. Elongation is a characteristic of shade avoidance.
Answer 2. The correct option is Option 4. Cellulose is a (1,4)?-D-glucan chain with no side branches. Lignin is a class of complex organic polymers, Pectin is a structural heteropolysaccharide and Hemicellulose is branched. So only one option remains correct which is option 4.
Answer 3. The correct option is Option E. The main molecular determinant of this symbiotic interaction between a legume plant and a rhizobium bacteria is the Nod Factor.
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