Fill in each blank with the correct word from the lesson.

1. _______ works best when three things are true: the unwanted bits are big enough to see, they look different from the main thing, and there aren't too many of them.
2. Hand-picking is an important topic in _______.
3. We can learn about _______ from this lesson.

Choose the best option for each question.

1. When is hand-picking the best method?
   a) When you can't see the unwanted bitsb) When unwanted bits are big enough to see and few in numberc) When everything is the same colourd) When there are tonnes of unwanted bits
2. Which of these would you hand-pick?
   a) Salt out of seawaterb) Iron filings from sandc) Stones from a small bowl of riced) Flour from bran
3. What tools do you need for hand-picking?
   a) A magnetb) A sievec) Just your fingers and eyesd) Wind and a basket

Write T for True or F for False in the brackets.

1. When unwanted bits are big enough to see and few in number is one of the key concepts in the lesson on Hand-picking.
2. When you can't see the unwanted bits is the main topic of this lesson.
3. Stones from a small bowl of rice is one of the key concepts in the lesson on Hand-picking.
4. Salt out of seawater is the main topic of this lesson.

1. In your own words, explain what Hand-picking means.
2. List two things you learned from this lesson on Hand-picking.