4.6 Tissues and Organs in plants

Question 1

What do epidermal tissues do in plants?

Answer 1

Cover the surface and protect them. These cells often secrete waxy substance that waterproof the leaf

Question 2

What do palisade mesophyll tissues do?

Answer 2

They contain chloroplasts which carry out photosynthesis

Question 3

What do spongy mesophyll tissues do?

Answer 3

contain some chloroplasts for photosynthesis but also have big air spaces and a large surface area for diffusion of gases

Question 4

What do xylem and phloem tissues do?

Answer 4

They transport tissues in plants

• Xylem carry water and dissolve mineral ions roots to leaves
• Phloem carry dissolve food from leaves to plant.

Question 5

SEE DIAGRAM PAGE 63 - CROSS SECTION OF A LEAF

Answer 5

SEE DIAGRAM PAGE 63 - CROSS SECTION OF A LEAF

Question 6

How are spongy mesophyll tissues adapted for photosynthesis?

Answer 6

-They have a SOME chloroplasts for photosynthesis.

Question 7

What adaptions do leaves have for photosynthesis?

Answer 7

• Large surface area
• Thin (diffusion)
• Air spaces
• stomata - pores to allow carbon dioxide to diffuse in and water to evaporate out (transpiration)
• Presence of veins
• chloroplasts

Question 8

What are the layers in a cross section of a leaf?

Answer 8

• upper epidermis
• palisade mesophyll
• spongy mesophyll
• lower epidermis

Question 9

Explain how the tissues in a leaf are arranged to form an effective organ for photosynthesis?

Answer 9

-Tightly packed palisade mesophyll cells at top of leaf contain many
chloroplasts for photosynthesis
and are protected by epidermis.
-Spongy mesophyll cells also photosynthesise and have large air spaces
and surface area to maximise gas exchange.
-Xylem supply water for photosynthesis,
-phloem transport food from photosynthesis around plant.
-Stomata can be opened or closed by guard cells to let gases in and out.

Question 10

What parts of the plant are part of its transport system?

Answer 10

leaves, stem, roots