B. Structural adaptation to living in aquatic environment.
c. A functional adaptation to high temperature.
II. Fill in the blanks:
1. The fingers of hawks end with sharp
2. Vulture is an example of birds while is an example of insectivorous plant.
III. Choose the correct answer:
1. The function of poisonous secretion of snakes is .
(catch prey adapt with high temperature adapt with daylight )
2. The limbs of bats are
(paddles claws wings )
3. The ducks ..filters mosses from water.
(legs beak webbed feet )
4. Insectivorous plants get nitrogenous material from ..
(captured insects photosynthesis soil )
IV. Write the scientific term:
1. The modification of the structure, function or behavior of living organisms to suit the conditions of the environment.
2. Plants that capture & feed on insects.
V. Give reasons for the following :
1. The feet of camels are thick pads.
2. The legs & beaks of herons are long & thin.
3. The limbs of dolphins are paddles & those of bats are wings.
4. Insectivorous plants capture insects.
VI. Fill in the blanks:
Long thin fingers
Tear the prey
Walking in the desert
Webbed feet (palms)
Animals adapt to the conditions of their environment with different methods.
Ø The temperature in winter is low & not suitable for some organisms such as frogs & toads. These animals bury themselves in mud, they stop feeding & reduce their bodies vital activities & they sleep through winter.
Ø During spring, when the temperature is suitable, they wake up & their bodies activities return back to normal.
Ø Desert animals aestivate during summer, (i.e. they sleep in their burrows) to avoid the high temperature
& shortage in water.
Ø Jerboa, desert snails & some insects are some of the animals which survive through summer by aestivation.
Ø The quail is one of the birds which live in polar regions during spring. In winter, quail birds fly towards warm regions where they reproduce.
Elodea & hyacinth are aquatic plants which adapt to the conditions of their environment .
Aquatic plants dont have enough oxygen or light. Water currents are strong.
Elodea plant which lives submerged in water adapts to the environment as follows:
Oxygen is needed for respiration & to help the plant float near water surface to get light.
Ø The conditions of the desert are
- Rare (shortage) rainfall
- Strong wind
- High temperature during the day & low temperature during night
1. Calmagrostis plant has roots that extend deeply in the soil to get ground water.
- The leaves are small spiral & ribbon like.
- The stomata (pores on the surface) are few, this saves water & reduce transpiration (evaporation).
2. Opuntia & cactus
- store rain water in their stems.
- Their stems are short to overcome wind.
- Their leaves are modified to spines to reduce transpiration.
- They are covered with wax to reduce transpiration.
1. The leaf insect matches the colour & shape of a leaf, therefore predating birds dont see it easily.
2. The stick insect matches the colour & shape of a branch.
3. Chameleon (a type of lizard ) has the colour of its environment. It hides to capture its food of insects.
The camel is the desert ship:
The camel has many features that help it to adapt with the conditions of the desert (water shortage high temperature during day & low temperature during night strong wind).
1. The eyes have a large number of lacrymal (tear) glands & long eyelashes to protect the eyes from sand storms .
2. The ears are small & are covered with dense hair to prevent dust from going in the ears.
3. The fur that covers the vital organs is thicker than that covers that rest of the body. The fur is heat insulator which keeps the body warm when the temperature is low at night.
4. The thick flat pads help the camel in walking on soft hot sand.
5. The upper lip is forked & the enamel of the teeth is strong, therefore the camel can eat spiny cactus without being harmed.
6. The hump stores excess food in the form of fat, therefore the camel can survive for months without eating food.
7. The body temperature of the camel can rise from 34o to 41o during day without sweating. (remember that the temperature of healthy human has to stay 37o therefore hell sweat a lot to cool his body if hes in the desert).
8. The camel can drink a huge amount of water in one time & store it in its body, therefore it can go in the desert without drinking for a long time.
I. Give an example (the name of an animal) which adapts to its environment using the following methods:
1. Camouflage .
2. Hibernation .
3. Aestivation .
4. An aquatic plant
5. A desert plant with spiral leaves
6. A desert plant with fleshy (juicy) stem
II. What the function of:
1. Air chambers for the elodea plant.
2. Thick pads for the camel.
3. Long branched roots for calmagrostis.
4. Long eye lashes & lacrymal glands for the camel.
5. Burrows for reptiles.
6. Fleshy (juicy) stem in some desert plants.
7. The ribbon like leaves of elodea.
III. Choose the correct answer:
1. In winter , frogs the body activities.
(reduce increase dont change)
2. The desert is characterized by
(shortage of water plenty of water low temperature during day)
3. Elodea lives
(submerged in water near the surface in the desert deep in irrigation canals)
IV. Give reasons for the following:
1. Some animals hibernate.
2. Some birds migrate from their usual habitats during winter.
3. The camels fur is denser over vital organs & thinner in other areas.
4. Elodea roots are weak.
5. Opuntia leaves are spiny.
6. The hump of the camel stores fat.
V. Compare elodea plant to calmagrostis plant in the following table: