Plant Hormones and Their Uses Quiz P188

Which plant hormone is important in initiating seed germination and triggers the breakdown of food stores in seeds?

• Auxin

• Gibberellins

• Ethene

• Cytokinin

What is the main function of ethene in plants?

• Stimulating root growth

• Controlling cell division and ripening of fruits

• Initiating seed germination

• Absorbing minerals from soil

How do gardeners use auxin-based hormone rooting powder?

• To increase the size of fruits

• To stimulate the growth of new roots in cuttings

• To prevent seed germination

• To kill weeds in the garden

What does the diagram illustrate about the use of hormone rooting powder?

• It prevents the growth of new roots

• It increases the chances of growing successful cuttings

• It kills unwanted plants

• It reduces the variety in offspring

Why are hormone weed killers considered selective herbicides?

• They kill all types of plants equally

• They only affect one type of plant and not another

• They increase the growth of all plants

• They are used only in greenhouses

What happens if you spray auxin solution onto the leaves of plants?

• The plant grows slowly

• The plant absorbs the hormone and may die due to rapid, uncontrolled growth

• The plant produces more seeds

• The plant becomes resistant to diseases

Which type of plants absorb more hormone weed killer, making them more likely to be killed by it?

• Narrow-leaved plants (monocotyledons)

• Broad-leaved plants (dicotyledons)

• All plants equally

• Only fruit plants

Why do farmers use hormone weed killers in fields of cereal crops?

• To increase the number of weeds

• To remove competition for light and minerals from the soil

• To make the crops grow slower

• To change the color of the crops

What is the main reason gardeners take cuttings from plants?

• To produce plants with different characteristics

• To make more identical plants

• To reduce the number of plants

• To change the color of flowers

How does the use of rooting hormone powder benefit commercial horticulturists?

• It reduces the number of successful cuttings

• It helps produce large numbers of successful cuttings to sell to the public

• It makes plants grow slower

• It prevents the formation of roots