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Introduction of Nile Perch in lake Victo...

Introduction of Nile Perch in lake Victoria of South Africa resulted in
(a) Excessive growith of water weeds
(b) Eliminations of water weeds
(c) Elimination of many species of cichild fish
(d) Excessive growth of cichild fish.

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The correct Answer is:
D
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The elimination of around 200 species of cichlid fish from Lake Victoria of East Africa is an example of

Assertion : The Nile perch introduced into lake Victoria in east Africa led to the extinction of an ecologically unique assemblage of more than 200 species of cichlid fish in the lake. Reason : When alien species are introduced deliberately for economic or other uses, they often become invasive and cause extinction of indigenous species. (a) If both assertion and reason are true and reason is the correct explanation of assertion. (b) If both assertion and reason are true but reason is not the correct explanation of assertion. (c) If assertion is true but reason is false. (d) If both assertion and reason are false.

Consider the following six statements (a-e) about causes of biodiversity losses. a. Tropical rain forests once covering more than 14% of the earth's land surface, these forests now cover no more than 0.6%. b. Biological system should not be exploited beyond the degree of their renewability. c. Nile perch, a large predator fish was introduced into Lake Victoria of East Australia. d. Lantana is an indigenous plant of our country. e. Recent illegal introduction of the American catfish for aquaculture purpose is posing a threat to the indigenous catfishes in our rivers. Which of the above statement(s) is/are correct?

A white amorphous powder (A) when heated gives a colourless gas (B), which turns lime water milky and the residue (C) which is yellow when hot but white when cold. The residue (C) dissolves in dilute HCl and the resulting solution gives a white precipitate on addition of potassium ferrocyanide solution. (A) dissolves in dilute HCl with the evolution of a gas which is identical in all respects with (B). The solution of (A) as obtained above gives a white precipitate (D) on addition of excess of NH_(4)OH and on passing H_(2)S . Another portion of this solution gives initially a white precipitate (E) on addition of NaOH which dissolves in excess of it. Compounds (A) to (E) are identified as:

Select the species which are extincted due to over exploitation. Nile perch, water hyacinth, african catfish, passenger pigeon, lantana, cichild fish, steller's sea cow, quagga, dodo.

In a village in Karnatka, people started cultivating crops all around a lake which was always filled with water. They added fertilisers to their field in order to enhance the yield. Soon they discovered that the waterbody was completely covered with green floating plants and fishes started dying in large numbers. Analyse the situation and give reasons for excessive growth of plants and death of fish in the lake.

Which pair is essential for the growth of fish in water? (a) Nitrates and sulphates (b) Sulphates and carbonates (c) Phosphates and carbonates (d) Calcium and phosphorus

Read the following statements carefully and find the incorrect statements: A. More than 1 percent impurities make domestic sewage unfit for human use. B. Less BOD causes mortality of fish and other aquatic creatures. C. Presence of large amounts of nutrients in water also causes excessive growth of planktonic algae, called an algal bloom. D. Algai bloom causes deterioration of the water quality an decreases fish mortality. E. Some bloom-forming algae are extremely toxic to human beings and animals. F. Eichhornia crassipies is the world's most problematic aquatic weed.

Find out correct statements - (A)Mammals, amphibia, freshwater fishes are ureotelic. (B) Waste product of bird and insect is same. (C) Fish eliminate ammonia through gill surfaces as NH_(4)^(+) (D) Uric acid is most toxic form and requires large amount of water for its elimination. (E) Excretory structures of most insects are malpighian tubules.

Which of the following fish led to the extinction of an ecologically unique assemblage of more than 200 species of cichild fish in the lake Victoria of E.Africa ? (a) Catla catla (b) Dog fish (c) Nile perch (d) African catfish

DINESH PUBLICATION ENGLISH-BIODIVERSITY AND ITS CONSERVATION-All Questions
  1. Find the wrongly matched pair

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  2. Match the columns and find the correct option

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  3. Introduction of Nile Perch in lake Victoria of South Africa resulted i...

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  4. Given here is representation of the extent of global diversity of vert...

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  5. Find the erongly matched pair

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  6. Which among these is not an ex situ conservation strategy

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  7. Which of the following is not an ex-situ conservation

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  8. The number of taxa present within a particular area or an ecosystem is

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  9. Assertion (A). In situ conservation is an ideal conservation strategy ...

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  10. Palamau (Betla) National Park is situated in

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  11. Which statement is not true about biodiversity in India

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  12. Which of the following is a result of habitat destruction, poaching, c...

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  13. Which of the following is generic name for the national flower of Ind...

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  14. The concept of "Biosphere Reserve" was evolved by

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  15. Which of these programmes is used to conserve a species from extinctio...

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  16. Identify the ecologist from the given hints (i) He carried out long ...

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  17. Which one of the following is not an in situ conservation method

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  18. Asiatic Wild Ass is found in

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  19. Which of the following is the most important causes for animals and pl...

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  20. Which is the National Aquatic Animal of India

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