Câu hỏi:
04/04/2020 1,169Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 43 to 50.
Orchids are unique in having the most highly developed of all blossoms, in which the usual male and female reproductive organs are fused in a single structure called the column. The column is designed so that a single pollination will fertilize hundreds or thousands, and in some cases millions, of seeds, so microscopic and light they are easily carried by the breeze. Surrounding the column are three sepals and three petals, sometimes easily recognizable as such, often distorted into gorgeous, weird, but always functional shapes. The most noticeable of the petals is called the labellum, or lip. It is often dramatically marked as an unmistakable landing strip to attract the specific insect the orchid has chosen as its pollinator.
To lure their pollinators from afar, orchids use appropriately intriguing shapes, colors, and scents. At least 50 different aromatic compounds have been analyzed in the orchid family, each blended to attract one, or at most a few, species of insects or birds. Some orchids even change their scents to interest different insects at different times.
Once the right insect has been attracted, some orchids present all sorts of one-way obstacle courses to make sure it does not leave until pollen has been accurately placed or removed. By such ingenious adaptations to specific pollinators, orchids have avoided the hazards of rampant crossbreeding in the wild, assuring the survival of species as discrete identities. At the same time they have made themselves irresistible to collectors.
Which of the following is a kind of petal?
Đáp án chính xác
Câu hỏi trong đề:
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Trả lời:
Giải bởi Vietjack
Đáp án D
Thông tin: The most noticeable of the petals is called the labellum, or lip.
Dịch nghĩa: Đáng chú ý nhất trong những cánh hoa được gọi là cánh môi, hay môi.
Như vậy “labellum” là một loại cánh hoa. Phương án D. The labellum = cánh môi, là phương án chính xác nhất.
A. The column = trụ nhụy
… the usual male and female reproductive organs are fused in a single structure called the column = … cơ quan sinh dục đực và cái bình thường được hợp nhất thành một cơ cấu trúc duy nhất được gọi là trụ nhụy.
Như vậy trụ nhụy là cơ quan sinh dục của hoa chứ không phải cánh hoa.
B. The sepal = lá đài
Surrounding the column are three sepals and three petals = Xung quanh trụ nhụy là ba lá đài và ba cánh hoa.
“sepal” và “petal” là hai khái niệm được tách hẳn nhau ra, do đó lá đài không phải một loại cánh hoa.
C. The stem = rễ cây
Nhà sách VIETJACK:
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