PBL Plant Physiology
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Transcript of PBL Plant Physiology
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8/8/2019 PBL Plant Physiology
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LIVING THINGS AVOID CONTACTWITH DIRECT SUNLIGHT
PROBLEM BASED LEARNING
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DALILA BINTI AIDIDALILA BINTI AIDI
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NUR FATHIAH BINTI ABU BAKAR AL BAKRINUR FATHIAH BINTI ABU BAKAR AL BAKRI
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SITI RAHAYU BINTI MOHAMED NOORSITI RAHAYU BINTI MOHAMED NOOR
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FASLIATIN BINTI THAZALIFASLIATIN BINTI THAZALI
D200910348D200910348
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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
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WHAT IS DIRECT SUNLIGHT?
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WHAT ARE THE EFFECTS OF DIRECTSUNLIGHT???
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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.
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responds to continued sun exposure bythickening and hardening ~ Leathery
~ wrinkles
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Skin cancer- Ultravioletradiation
-Energy of sunlight ~ radiation
- Consist : visible light
: Otherrays
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Eye damage
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Damage tissue of the eyes- Excess exposure to UV radiation mayincrease the incidence of cataracts
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the loss of transparency inthe lens,clouding vision.
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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,
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HOW DIRECT SUNLIGHT CANCAUSE SKIN CANCER?
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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.
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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.
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Rate of transpiration is directly related to the
degree of stomata opening, Adaptation is necessary to limit the loss of
water from plant tissue