Some herbicides such as dichlorophenyldimethylurea (DCMU, also known as diuron) and paraquat, block photosynthetic electron flow from where ?

a.) DCMU blocks electron flow at the quinone acceptors of PSII, by competing for the binding site of plastoquinone that is normally occupied by PQB

b.) Paraquat accepts electrons from the early acceptors of PSI and then reacts with oxygen to form superoxide, O2 – , a species that is very damaging to chloroplast components

c.) DCMU blocks electron flow at the pheophytin acceptors of PSII, by competing for the binding site of pheophytin

d.) Paraquat accepts electrons from the Iron-sulfur system of PSI and then reacts with oxygen to form superoxide, O2 – , a species that is very damaging to chloroplast components

Which of the following combination is true?

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#Question id: 8944

#Unit 9. Diversity of Life Forms

Which two groups are most clearly represented in the Ediacaran fauna?

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#Question id: 8945

#Unit 9. Diversity of Life Forms

Which of these is the basal group of the Eumetazoa?

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#Question id: 8946

#Unit 9. Diversity of Life Forms

Which two groups have members that undergo ecdysis?

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#Question id: 8947

#Unit 9. Diversity of Life Forms

Organisms that are neither coelomate nor pseudocoelomate should, apart from their digestive systems, have bodies that

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#Question id: 8948

#Unit 9. Diversity of Life Forms

What distinguishes a coelomate animal from a pseudocoelomate animal is that coelomates

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#Question id: 8949

#Unit 9. Diversity of Life Forms

Which of the following functions is an advantage of a fluid-filled body cavity?