45. The polarity of a plant is established when (A) cotyledons form at the shoot end of the embryo (B) the shoot-root axis is established in the embryo (C) the primary root breaks through the seed coat (D) the shoot first breaks through the soil into the light as the seed germinates

45. The polarity of a plant is established when
(A) cotyledons form at the shoot end of the embryo
(B) the shoot-root axis is established in the embryo
(C) the primary root breaks through the seed coat
(D) the shoot first breaks through the soil into the light as the seed germinates

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題目解析這道題目探討的是植物胚胎的極性...

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10. Which of the following is NOT the correct match of the scientists and their discovery? (A) Erwin Chargaff discovered that in DNA from any species, the amount of adenine equals the amount of thymine, and the amount of guanine equals the amount of cytosine (B) Mathew Meselson and Franklin Stahl discovered that RNA can be converted to DNA by reverse transcriptase (C) James Watson and Francis Crick discovered that DNA is a double helix in structure (D) Alfred Hershey and Martha Chase discovered that DNA is the genetic material

45. The polarity of a plant is established when
(A) cotyledons form at the shoot end of the embryo
(B) the shoot-root axis is established in the embryo
(C) the primary root breaks through the seed coat
(D) the shoot first breaks through the soil into the light as the seed germinates

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