Answer from the Text
W.1.8
Read the text, then answer the questions.
How Seeds Travel
A seed cannot grow in its parent's shadow. There is not enough light. So seeds have to move away. Some seeds have wings. A sycamore seed spins like a tiny helicopter and lands far from the tree. Some seeds hook onto fur. A burr catches on a passing fox and drops off somewhere new. Some seeds sit inside fruit. A bird eats the fruit and the seed comes out later, miles away.
- 1. How does a burr travel?
- 2. The author says seeds have to move away. What reason is given?
- 3. What is a "burr"?
- 4. What does a sycamore seed do as it falls?
How a Bridge Stands Up
A bridge has to hold its own weight and the weight of everything crossing it. The simplest bridge is a beam: a flat piece laid across a gap. A beam bridge cannot be very long, or it sags in the middle. An arch bridge is curved. The curve pushes the weight out to the ends, where the ground is solid. That is why arch bridges can cross wider gaps.
- 1. What shape is an arch bridge?
- 2. What happens to a beam bridge that is too long?
- 3. Why does the author say arch bridges can cross wider gaps?
- 4. What does "sags" mean here?
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