Plant Responses To Stress.

Question 1

Factors for plant stress?

Answer 1

1- cold
2- excess light
3- drought
4- pests

Question 2

When temperatures drop to freezing or as the seasons change the plants use two main strategies to not die.
What are these two strategies?

Answer 2

1- abscission, plant will drop leaves or ripen and detach fruit such as nuts.
2- plant import salt to the cytoplasm and vacuoles to lower temperature at which water freezes.

Question 3

How does the Arabidopsis thaliana respond to excess light?

Answer 3

By releasing a carotenoid called zeaxanthin which effectively shuts down chlorophyll’s ability to absorb photons, slowing photosynthesis.

Question 4

What’s the role of abscisic acid on drought?

Answer 4

ABA will signal stomata to stay closed slowing both photosynthesis and water loss.

Question 5

How are plant adapted to stop grazers?

Answer 5

1- barks
2- spiny or hairy leaves
3- thorns

Question 6

Explain the importance of strychnine for plants

Answer 6

It is an alkaloid that act as pesticides or taste bitter. It has pharmacological effects on insects or animals, including humans

Question 7

What is the plants respond to pests

Answer 7

Production of volatile organic compounds or alkaloids to act as insecticides, or to have a bitter taste.