Plant Hormones And Their Uses

Question 1

where is the hormone gibberellins produced

Answer 1

in seeds

Question 2

once a seed germinates and roots and shoots start to grow, why is gibberellins released

Answer 2

• because it causes starch in a seed to turn into sugars

- which the seed needs uses for energy to grow

Question 3

what do gibberellins stimulate

Answer 3

• stem growth
• flowering
• fruit development

Question 4

name four uses of plant hormones

Answer 4

• selective weed killers
• rooting powder
• seedless fruit
• fruit ripening

Question 5

how are hormones used for selective week killers

Answer 5

• they are sprayed on crops
  and kill any plants with broad leaves like weeds by making them grow too fast
• it doesnt affect the crop sprayed on because they would have narrow leaves or be cereals

Question 6

how are hormones used in rooting powder

Answer 6

• the powder contains auxins

- so when the shoot is dipped into the powder it stimulates it to grow roots rapidly

Question 7

how are hormones used in seedless fruit

Answer 7

• normally if a flower doesnt get pollinated the seeds wont grow
• if plant hormones such as giberellins are applied to the unpollinated flowers of some types of plant
• the fruit will grow but the seeds won’t
• some seedless citrus fruits can be grown this way

Question 8

how are hormoners used in fruit ripening

Answer 8

• ethene is made by many fruits
• it is a hormone that causes them to ripen
• fruits are picked green and ripened in storage using ethene gas.

Question 9

what are the three types of plant hormone

Answer 9

• auxin
• gibberellin
• ethene / ethylene

Question 10

how are hormones carried through plants

Answer 10

• diffusion
• active transport
• or mass flow

Question 11

advantages of using hormones in fruit farming

Answer 11

• ripen and grow crops faster means more money
• can get rid of pests like weeds and cause them to not grow back
• quicker than digging out weeds

Question 12

disadvantages of using hormones in fruit farming

Answer 12

• may not work and weeds may still grow which is promising something that isnt met
• adding hormones to change them is said to be poisoning by some people
• weedkiller is dangerous to the surrounding environment

Question 13

why do fruit have seeds in them

Answer 13

• fruit with seeds in the middle normally only grows on flowering plants that have been pollinated by insects
• If the flower doesn’t get pollinated the fruit and seeds don’t grow