(b)
When the adaptive changes divert from the original direction they
are called secondary adaptation. The changes are diverted along different lines due to change of the original home of the organisms and they subsequently adapt themselves to some new environment. Example: Aquatic adaptation of whales.
What is primary and secondary aquatic adaptation?
Adaptations to water habitat are of two types: primary aquatic adaptations which includes
primitive gill-breathing vertebrates
(fishes); secondary aquatic adaptations which are acquired as in reptiles and mammals.
What are the difference between primary and secondary adaptation?
(a) When the adaptation remains in the original direction, it is said to be primary and the subsequent changes remain more or less in the same direction from the very appearance of the animal. … (b) When
the adaptive changes divert from the original direction
they are called secondary adaptation.
In which adaptation to aquatic life is secondary?
Secondary aquatic animals have a
more or less stream lined body contour
. Neck constriction disappears. Tail enlarges to take a shape like that of fish tail, e.g., aquatic Cetaceans, Sirenia and Pinnipedia. Any protuberances, like pinna or hair disappear from the body.
What is secondary aquatic transformation?
Several groups of tetrapods have undergone secondary aquatic adaptation, an
evolutionary transition from being purely terrestrial to living at least part of the time in water
. … Secondary aquatic adaptations tend to develop in early speciation as the animal ventures into water in order to find available food.
What is the difference between primary and secondary?
Primary sources can be described as those sources that are closest to the origin of the information. … Secondary sources often use
generalizations, analysis, interpretation, and synthesis of primary sources
. Examples of secondary sources include textbooks, articles, and reference books.
What is the difference between primary and secondary successions?
In primary succession, newly exposed or newly formed rock is colonized by living things for the first time. In secondary succession, an
area previously occupied by living things is disturbed
—disrupted—then recolonized following the disturbance.
Which is an aquatic adaptation answer?
Some of the adaptations of aquatic animals are:
Their body is streamlined
and hence, they can swim easily. They have gills as the respiratory organs. They have fins as the locomotory organs, Various types of fins are present in fishes such as dorsal fins, pectoral fins, caudal fins etc.
What are the adaptations of aquatic plants?
The most common adaptation is the presence of
lightweight internal packing cells, aerenchyma
, but floating leaves and finely dissected leaves are also common. Aquatic plants can only grow in water or in soil that is frequently saturated with water. They are therefore a common component of wetlands.
What do you mean by aquatic adaptation?
Aquatic adaptations are
the changes or adjustments in behaviour,physiology or structure of an organism which enable them to live in an aquatic environment
. Examples. *stream-lined body shape -helps to minimize water resistance , easy to move in water.
Which is an aquatic adaptation class 6?
The streamlined shape of sea animals
is an adaptation for swimming in water. (2) Most of the sea-animals have gills which enable them to use oxygen dissolved in water for breathing. So, the presence of gills in sea-animals is an adaptation for breathing inside the water.
How do adaptations help organisms?
Adaptations are inheritable characteristics that increase an organism’s ability to survive and reproduce in an environment. Adaptations can help
an organism find food and water, protect itself, or manage in extreme environments
.
What are the adaptation seen in different types of vertebrate?
Vertebrates are adapted
to life underground, on the surface, and in the air
. They feed upon plants, invertebrate animals, and one another. Vertebrate faunas are important to humans for food and recreation.
Are dragonflies secondarily aquatic?
A terrestrial group of animals which
has returned to an aquatic mode of life
– e.g. dolphins, whales, juvenile dragonflies, penguins.
Are Crocodiles secondarily aquatic?
Marine iguanas and partly marine crocodiles (such as the saltwater crocodile and the American crocodile) are
all semiaquatic
. Most sea snakes are ovoviviparous (live-bearing) and fully aquatic (the exceptions being the oviparous, semiaquatic sea kraits).
What specialized adaptations do fish have for their aquatic lifestyle?
- Fish have gills that allow them to “breathe” oxygen in water. …
- Fish have a stream-lined body. …
- Most fish have several fins for swimming. …
- Fish have a system of muscles for movement. …
- Most fish have a swim bladder.
