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Understanding Chemicals in Agriculture and Food

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Understanding Chemicals in Agriculture and Food

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Questions and Answers

What is the purpose of using herbicides on fields?

To kill weeds that compete with crops for water, space, and nutrients.

Explain why farmers use insecticides on their crop fields.

To remove harmful insects that can damage the crops.

Why is it mentioned that hand-pulling weeds raises humanitarian issues?

Due to concerns regarding working conditions and related humanitarian factors.

What are some examples of pests that pesticides are used to control?

Weeds, insects, fungi, and rodents. Signup and view all the answers

Why is it stated that the phrase 'chemical free' is a marketing gimmick?

Because all substances, including natural ones, are chemicals. Signup and view all the answers

Why do farmers use herbicides to control weeds instead of alternatives like hand-pulling or tillage?

To promote crop growth and higher productivity while avoiding issues like erosion and degraded soil structure. Signup and view all the answers

What is a chemical according to one good definition?

A form of matter having constant chemical composition and characteristic properties. Signup and view all the answers

What is a chemical bond?

A strong association between two different atoms. Signup and view all the answers

What was initially thought to be the smallest component of matter?

Atoms. Signup and view all the answers

What information can be found on a Periodic Table of Elements?

Atomic weight and atomic mass. Signup and view all the answers

What does chemistry focus on in terms of atoms and elements?

The characteristics, interactions, bonding, and performance of atoms and elements. Signup and view all the answers

How is the colloquial use of the word 'chemical' different from its scientific definition?

In everyday language, 'chemical' is often associated with hazardous or strange substances, while in science, everything is considered a chemical. Signup and view all the answers