Chapter 1

Question 1

State an example of cell modifued from epidermal cells

Answer 1

Guard Cell & Root Hair Cell

Question 2

Differences of parenchyma

Answer 2

• simplest living cell and do not undergo DIFFERENTIATION
• thinnest cell wall
• involved in photosynthesis,help in storage of starch and sugar
• involved in gaseous exchange

Question 3

Differences ; Collenchyma

Answer 3

• made of matured living cells that flexible
• thicker than parenchyma tissues
• provide mechanical support and elasticity to plants

Question 4

Differences ; Sclerenchyma

Answer 4

• consist of dead matured cells
• thickest among three ground tissues
• provide support and mechanical strengths to parts of matured plants

Question 5

How is structure of xylem adapted to its function?

Answer 5

• Xylem is made up of dead cells w/o CYTOPLASM
• consist of xylem vessels that elongated,hollow,connected to each other from roots to leaves
• This enables xylem to transport water and mineral salts to all parts of plants

Question 6

What are the zones that can be observed at the tip of a seedling radicle?

Answer 6

Zone of cell division,elongation,differentiation

Question 7

Desc the shapes and structures of cells that can be observed in between zones of seedling radicle

Answer 7

• Zone of cell division has small cells with dense cytoplasm,large nucleus and small vacuoles.
• Zone of cell elongation has long and wide cells w large vacuoles
• Zone of cell differentiation is made of various shapes and structures of cells depends on their functions.

Question 8

Name three zones of cell growth

Answer 8

Zones of division,zone of elongation,zone of differentiation

Question 9

Explain the formation of secondary xylem and secondary phloem

Answer 9

• secondary growth occur when vascular cambium divided actively through mitosis
• cells in cambium ring divide inwards to form new xylem and outwards to form new phloem
• new xylem become secondary xylem and new phloem become secondary phloem

Question 10

Why is secondary growth important to plants

Answer 10

The importances of secondary growth
•To provide stability to plants by increasing stem and root diameter
•To produce more xylem and phloem tissues
•Replace old damaged xylem and phloem tissues
•live longer by increasing chances of seed production and reproduction

Question 11

“Secondary growth support primary growth”

Why?

Answer 11

The primary growth is followed by secondary growth which increases the diameter or circumferences of plant stems.

Question 12

State the classification of plants based on their lifespan

Answer 12

Annual plants,biennal plants,perennial plants

Question 13

Specify the type of plants that are able to survive in extreme surroundings

Answer 13

Perennial plants.
These plants have adaptable structures to surrounding and temp changes.Most of this plants able to flower and fruit many throughout their lives which increase CHANCES of SPECIES SURVIVAL

Question 14

Growth curve for 3 plants are single sigmoid or combination few sigmoid series.
Why perennial growth curve consist of series of small sigmoid curve?

Answer 14

A series of sigmoid represent one year of growth.

• Growth curve influenced by seasons.
• During summer rate growth is high.
• During winter is low