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Standard X
Biology
Evidences of Evolution
Finches that ...
Question
Finches that feed on cactus have
___
beaks.
A
long and sharp
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B
Small
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C
sharp
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D
large
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Q.
Darwin finches show a variety of beaks suited for eating large seeds, flying insets and cactus seeds but the ancestral stock of darwin finches were :-
Q.
Assertion :Darwin's finches show a variety of beaks suited for eating large seeds, flying insects and cactus seeds. Reason: Ancestral seed-eating stock of Darwin's finches radiated out from South American mainland to different geographical areas of the Galapagos Islands, where they found competitor for new habitats.
Q.
Assertion: Darwin’s finches show a variety of beaks suited for eating large seeds, flying insects, and cactus seeds.
Reason: Ancestral seed-eating stock of Darwin’s finches radiated out from South America mainland to different geographical areas of the Galapagos Islands, where they found competitor-free new habitats.
Q.
In the late 1970's, the Galapagos Islands experienced a severe drought that sharply reduced the finch population living there. It was discovered that only finches with large, thick beaks survived the drought as they subsisted on cactus, which are drought tolerant plants.
In the early 1980's, the Galapagos Islands underwent an El Nino event that led to higher annual levels of precipitation than normal. This climate event occurred just a few years after the drought. The increase in rainfall led to a dramatic increase in growth of seed-producing plants, which led to an abundance of foods for seed-eating finches, which have small, short beaks.
The increase in rainfall also decreased the availability of cactuses on the islands. Which of the following would you predict occurred in the finch population as a result of the second change in climate?
Q.
Select the correct option which matches the organism with its food habitat.
A. The ground finches - Seed crushers
B. Vegetarian tree finches - Leaves, buds and fruit feeder
C. Warbler finch - Nectar feeder
D. Cactus finch - Insectivorous
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