Plant Tissues, Organs And Organ Systems

Question 1

What tissues are doing in a leaf?

Answer 1

Upper epidermis

Palisade mesophyll

Spongy mesophyll

Lower epidermis

Xylem

Phloem

Question 2

What is a tissue?

Answer 2

A group of specialised cells with similar structures working together to perform a common function

Question 3

What is an organ?

Answer 3

A group of tissues that work together to perform a common function

Question 4

What is an organ system?

Answer 4

A group of organs and that work together to perform an overall life process

Question 5

What is the function of the epidermis tissue?

Answer 5

Covers and protects surface

Secretes a waxy substance which waterproof the leaf

Question 6

What is the function of the palisade mesophyll?

Answer 6

Contains lots of chloroplasts which carry out photosynthesis

Question 7

What is the function of the spongy mesophyll?

Answer 7

Contains some chloroplasts

Has big air spaces and large surface area for quick rate of diffusion of gases

Question 8

What is the function of the xylem?

Answer 8

Carries water and dissolved minerals from roots to leaves

Question 9

What is the function of the phloem?

Answer 9

Carried dissolved food from leaves around the plant

Question 10

What is the function of the meristem tissue?

Answer 10

Contains stem cells which rapidly divide to differentiate into cells needed

Question 11

What is the function of a root hair cell?

Answer 11

Uptake water by osmosis

Uptake mineral by active transport

Question 12

How are root hair cells adapted?

Answer 12

Increase surface area

Large permanent vacuole - speed up water movement

Many mitochondria for active transport

Question 13

How are xylem cells adapted?

Answer 13

Reinforced walls to support weight of plant

Narrow tube so sturdy water column

Spiral lignin so xylem can stretch as plant grows

Question 14

How is the phloem adapted?

Answer 14

Many mitochondria for cells to load sugars from mesophyll cells

Siege tube elements contain little cytoplasm and no nucleus

Cross walls with pores to allow flow of sap

Question 15

What is the function of a leaf?

Answer 15

Carries out photosynthesis

Question 16

What is the function of the stem?

Answer 16

Support leaves and flowers

Question 17

What tissues does the stem contain?

Answer 17

Meristem

Phloem

Xylem

Epidermal tissues

Question 18

What is the function of the root?

Answer 18

Takes in water and minerals from soil

Anchored the plant so it doesn’t fall over

Question 19

What tissues are there in roots?

Answer 19

Meristem at the ends

Xylem

Phloem

Epidermal

Question 20

What is the function of flowers?

Answer 20

Sexual reproduction

Question 21

What tissues are in a flower?

Answer 21

Xylem

Phloem

Stands

Anthems

Petal

Question 22

What Is transpiration?

Answer 22

The loss of water vapour by diffusion from the leaves of the plant through the stomata when they are opened to allow gas exchange for photosynthesis

Question 23

What is a transpiration stream?

Answer 23

The movement of water through a plant from the roots to the leaves as a result of the loss of water by evaporation by from the surface of leaves

Question 24

What factors affect transpiration?

Answer 24

Higher light intensity and CO2 concentration - more stomata open for photosynthesis

Higher temperatures - more energy

Dry conditions - steep gradient

Windy conditions - maintains conc gradient

More leaves - larger surface area

Question 25

What is a POTOMETER used for?

Answer 25

To show the water uptake of a plant under different conditions

Question 26

What adaptations are there to help reduce water loss?

Answer 26

WAXY CUTICLE is waterproof

STOMATA LOCATED UNSER LEAF so is protected from sunlight

GUARD CELLS control stomata movement

WILTING reduces surface area

Stomata close as a STRESS RESPONSE