30 Questions
How many kilometers do European eels travel to reach their spawning grounds in the Western Atlantic Ocean?
3,000 to 4,000 km
At what depth do European eels spawn in the Western Atlantic Ocean?
400-500 meters
What is the characteristic of the leptocephalus larva of the European eel?
It is transparent and has large eyes.
How long does it take for the leptocephalus larva to reach its home in the river?
3 years
What is the name of the second type of larva in the European eel's life cycle?
Elver
How do the elver larvae migrate upstream to reach their home in the river?
They rely on drift and are swept by the current.
What is believed to be the reason why some Swallows in North America changed their migration route?
They found a shorter route to similar habitats with less competition.
What triggers physiological changes in birds that lead to migration?
Hormonal changes in the gonads
What is the name of the hypothesis that suggests thyroid glands regulate the metabolic activities of birds, leading to migration?
The Thyroid Hypothesis
What type of migration occurs when only a few members of a species participate in migration?
Partial Migration
What is deposited in a bird's body before migration, stimulating the bird to migrate?
Fat
How many types of bird migration are recognized?
12
What is the main reason why willow warblers migrate from Central and Southern Africa to northern Europe and Asia?
To take advantage of the abundant insect food available in northern Europe and Asia
What is an advantage of breeding in the Arctic for birds such as Bewick's swans?
The longer day length allows them to feed for more hours
Why do dotterels migrate to the tops of the highest Scottish mountains?
To nest on the high tops and avoid competition from other plovers
What is a common reason why birds migrate to certain places year after year?
Because certain places are ideal for nesting
What happens to the forests of northern Europe and Asia during the winter?
They become cold and dark, and insects are hard to find
What is a characteristic of the Arctic during the summer?
There are almost 24 hours of daylight
What percentage of Indian bird species are migratory?
20%
Where do Koel birds emigrate to in the winter season?
Southern India and Sri Lanka
What type of migration is seen in Snowy owls?
Cyclic migration
What are birds like Sandpipers and Great snipes called?
Birds of passage
When do Nee/kants emigrate from Himalayan range to plains of India?
In spring season (March/April)
Which birds remain present in plains of India in spring season (March/April)?
Shoveller, Teal and Red Crested Pochard
What is the approximate distance traveled by the Rosy Paster from Eastern Europe to Central Asia?
3,000 kms
At what altitude do some species of birds, such as the Siberian crane, migrate?
Above 5,000 meters
What is a characteristic of migratory birds in terms of their time of journey?
They are very punctual
Where do some migratory birds, such as swallows, return to every year?
The same village and even the same tree
What is a characteristic of the routes taken by migratory birds?
They are definite and follow a specific path
What type of route do marine birds adopt?
Sea routes
This quiz explores the life cycle of European eels, including their migration patterns, spawning grounds, and larval stages. It covers the catadromous nature of freshwater eels and their unique characteristics.
Make Your Own Quizzes and Flashcards
Convert your notes into interactive study material.
Get started for free
