Salesa chemistry Chapters 5 and 6

Recently, used oil is being used as _____ fuel, providing an alternative fuel that doesn't deplete fossil reserves.

• petroleum

• biodiesel

• crude

• sustainable

(a)   are plastics derived from renewable sources.

Polylactic acid (PLA) , the most common bioplastic used today is non-renewable.

• True

• False

If soil pH falls below ______, it results in magnesium deficiency and increases the possibility of aluminium toxicity.

• 6

• 6.5

• 5.8

• 7

____ of the 17 essemtial plant nutrients are obtained from the soil.

• 13

• 14

• 15

• 16

Why does an altered pH affect plant growth?

Answer explanation

An altered pH affects plant growth by disrupting nutrient availability and uptake. Extreme pH levels can hinder essential processes, leading to poor growth and health.

What is the ideal pH range which ensures the most ready availibility of plant nutrients?

• 4-5

• 5-6

• 6-7

• 7-8

Nutrients like zinc, manganese, copper and iron do not dissolve easily in acidic soil.

• True

• False

_____ can thrive in acidic soil

• Sugarcane

• Rice

• Corn

• Wheat

India is the largest producer of rice in the world after China.

• True

• False