plant tissues

Question 1

what is the role of dermal tissue?

Answer 1

protects plant, prevents water loss, gas exchange and absorbs nutrients

Question 2

what do trichomes in dermal tissue do?

Answer 2

• reflects sunlight to cool plant
• reduces water loss by blocking wind
• may contain toxins for defense
• some trap and digest prey

Question 3

what do parenchyma do and what are some key features?

Answer 3

• has a thin cell wall
• abundant
• photosynthesis/gas exchange in leaves
• starch storage in roots
• are totipotent (can differentiate if needed)

Question 4

what do collenchyma do and what are some key features?

Answer 4

• uneven thick cell wall
• provides flexible support
• typically found outside vascular bundles

Question 5

what do sclerenchyma do and what are some key features?

Answer 5

• thin primary wall, thick stiff secondary wall (cellulose)
• dead at maturity
• made of fibres (elongated) and sclereids (adds graininess) for protection

Question 6

what is the role of xylem?

Answer 6

• one way tranport of water from roots to shoots
• contains lignin
• cells dead at maturity
• tracheids: long cells with pits for water movement
  vessels: wide cells with perforations for water movement

Question 7

what is the role of phloem?

Answer 7

• two way trasport of sugars/nutrients between shoots and roots
• sieve tubes long and thin, no nuclei
  companion cells: maintains cytoplasm, translates DNA
• plasmodesmata connects two cells

Question 8

what is the difference between monocot and eudicot root cells?

Answer 8

monocot = radiated xylem
eudicot = crossed xylem

Question 9

what is the difference between monocot and eudicot shoot cells?

Answer 9

monocot = scattered bundles
eudicot = ring arranged bundles

Question 10

what are some differences between monocots and eudicots?

Answer 10

monocots: one cotyledon, parallel veins, florals in multiples of 3
eudicots: two cotyledons, branched veins, florals in multiples of 4 or 5