Plant Physiology (lec 3)

Question 1

In what ways does plant development differ from animal development?

Answer 1

• plants develop continuously
• development has plasticity
• cannot move away from unfavourable env.
• phenotype can change during lifetime in response to env. changes

Question 2

What are the 3 principal tissue meristems laid down during plant embryogenesis?

Answer 2

• vascular tissues/procambium
• ground tissues/ground meristem
• epidermis/protoderm

Question 3

What are the 3 types of plant cells?

Answer 3

• parenchyma
• collenchyma
• sclerenchyma

Question 4

… cells:

• have thin, flexible walls
• are living at maturity
• carry out metabolic functions
• can differentiate into different cell types

Answer 4

parenchyma

Question 5

What is totipotent and what type of cells have this characteristic?

Answer 5

• the ability to form new tissues

- parenchyma

Question 6

… cells:

• have thick, uneven cell walls
• are living at maturity
• play a role in support

Answer 6

collenchyma

Question 7

… cells:

• have thick secondary cell walls
• dead at maturity
• usually can’t increase in length
• are divided into 2 types (fibers and sclereids)

Answer 7

sclerenchyma

Question 8

… are a type of sclerenchyma cell that is long and slender, providing tensile strength

Answer 8

fibers

Question 9

… are a type of sclerenchyma cell that is short w/ an irregular shape, providing protective surfaces

Answer 9

sclereids

Question 10

Name a way in which evolution has lead to diversification of organ and cell functions

Answer 10

leaf modification (ex spines vs petals)