pbl plant physiology

8/8/2019 PBL Plant Physiology

1/14

LIVING THINGS AVOID CONTACTWITH DIRECT SUNLIGHT

PROBLEM BASED LEARNING


2/14

DALILA BINTI AIDIDALILA BINTI AIDI

D200910348D200910348

NUR FATHIAH BINTI ABU BAKAR AL BAKRINUR FATHIAH BINTI ABU BAKAR AL BAKRI

D200910348D200910348

SITI RAHAYU BINTI MOHAMED NOORSITI RAHAYU BINTI MOHAMED NOOR

D200910348D200910348

FASLIATIN BINTI THAZALIFASLIATIN BINTI THAZALI

D200910348D200910348


3/14

FACTS IDEAS LEARNING ISSUES ACTION

Living things

avoid contactwith direct

sunlight.

Direct contact to

sunlight mightcause skin

cancer.

Plant avoid

transpiration.

What are the

effects of directsunlight?

How direct

sunlight can cause

skin cancer?

How transpirationoccur?

How does sunlight

affect plant growth?

Library

search onplant in

extreme

conditions.

FILA CHARTFILA CHART


4/14

WHAT IS DIRECT SUNLIGHT?


5/14

WHAT ARE THE EFFECTS OF DIRECTSUNLIGHT???


6/14


7/14

Sunburn

-Amount of UV exposure is greaterthan what canbe protected againstbythe skin's melanin.

-The lighteryour skin,the less melaninithas to absorb UV and protectitself.

-

responds to continued sun exposure bythickening and hardening ~ Leathery

~ wrinkles


8/14

Skin cancer- Ultravioletradiation

-Energy of sunlight ~ radiation

- Consist : visible light

: Otherrays


9/14

Eye damage

-

Damage tissue of the eyes- Excess exposure to UV radiation mayincrease the incidence of cataracts

-

the loss of transparency inthe lens,clouding vision.


10/14

Plants :

Transpiration ~ loss of water vaporfrom parts of plants~ cools plants and enables mass

flow of mineral nutrients and water

from roots to shoots. Up to 99% of the water absorbed by

roots is lost via transpiration throughplant leaves

rate of transpiration is directly relatedto the degree of stomata opening,


11/14

HOW DIRECT SUNLIGHT CANCAUSE SKIN CANCER?


12/14

There are three basic types of ultraviolet radiation:

UVA (long-wave UV),

UVB (sunburn UV), and

UVC (short-wave UV)

- UV radiation reaches the skin some radiation is reflected away

Remaining radiation is scattered into the tissues just beneath the skin's

surface absorbed by the skin's living cells.

UV radiation damages the fibers in the skin called elastin the skin begins

to sag, stretch, and lose its ability to go back into place after stretching

tears more easilytaking longer time to heal.

Damage can result in:

sunburn

increased rate of aging of the skin

skin cancer.


13/14

How plant adapt in straight

sunlight????

Enable mass flow of liquid water ,cools plants

Transports nutrients from the soil into the

roots and carries them to the various cells ofthe plant and is used to keep tissues from

becoming overheated.


14/14

Rate of transpiration is directly related to the

degree of stomata opening, Adaptation is necessary to limit the loss of

water from plant tissue

pbl plant physiology

Documents