Nhận biết (M1)

Some orchid species produce no nectar yet are still pollinated by insects. These orchids mimic the appearance and scent of nectar-producing flowers, deceiving insects into visiting them. Because a deceived insect receives no reward, it tends to leave quickly and is unlikely to visit a second flower of the same deceptive species. This suggests that, for such orchids, the effectiveness of the deception may be ______.

Which choice most logically completes the text?

• A.

  unrelated to the number of nectar-producing species growing nearby.

• B.

  limited by how quickly insects learn to avoid the unrewarding flowers.

• C.

  greater than that of orchids that do produce nectar.

• D.

  dependent on the orchids producing larger quantities of nectar.