Dodder is an unusual and unwanted plant that attacks other plants. Except for its flowers, the plant looks like spaghetti noodles. Its almost leafless, thread–like stems hang down atop other plants that dodder needs to stay alive. Dodder does not produce its own food. Instead, it steals it from other plants. It feeds by sucking juices from the plant it is wrapped around, often making its host very weak or even killing it. Dodder can find other plants by their smell. When a dodder seedling starts growing, it follows the scent of plants it prefers, like tomato plants, potato plants, or other farm crops.
Unlike most plants that usually grow in the direction of light or warmth, a dodder plant will grow in the direction of, for example, tomato odor––if a tomato happens to be growing nearby.
However, a young dodder plant must find a host plant quickly. If it cannot catch a whiff of a potential host within a few days, it will dry up and disappear—even if there is plenty of water around. Once it finds a host, the young dodder plant will attach itself to it and start growing faster. At that point, the dodder plant will drop its root.
What is the main topic of the passage?
Suy nghĩ và trả lời câu hỏi trước khi xem đáp án
Lời giải:
Báo saiChủ đề chính của đoạn văn là gì?
A. Một loại cây nông nghiệp mới
B. Cây có hại cho con người
C. Những khả năng đặc biệt của một loài cây nguy hiểm
D. Những cải tiến gần đây về phương pháp nuôi
Ý chính của đoạn văn là về cây tơ hồng, những khả năng đặc biệt của nó được thể hiện trong đoạn 1: Its almost leafless, thread–like stems hang down atop other plants that dodder needs to stay alive. Dodder does not produce its own food. Instead, it steals it from other plants. It feeds by sucking juices from the plant it is wrapped around, often making its host very weak or even killing it.