501: In the grasslands, trees do not replace the grasses as a part of an ecological succession because of
(a) insects and fungi
(b) limited sunlight and paucity of nutrients
(c) water limits and fire
(d) None of the above
Explanation:
Primary succession is the gradual growth of an ecosystem over a longer period. It looks like: lichen - grasses - trees.
In contrast, secondary succession occurs on substrate that previously supported vegetation before an ecological disturibance from smaller things like floods, hurricanes, tornadoes, and volcanic eruptions which destroyed the plant life.
But trees replacing grass doesn't always happen with grasslands:
Look at the following
Grass ecosystems are an early stage of succession in regions where the mature ecosystems are forests. However, grass ecosystems are climax ecosystems in grassland regions, where there is not enough rainfall to support a forest.
Ecological succession of a grassland is desert.
Two factors for evolution of temperate grassland biome, (i) Extreme continental climate with limited supply of water due to low rainfall, (ii) human activities mainly burning of vegetation".
502: Which of the following parks/ sanctuaries is/are correctly matched with their location
I : Ghana : Assam
II : Gir : Rajasthan
III : Manas : Assam
IV : Corbett : M.P
V : Periyar : Kerala
VI : Dudwa : U.P
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(a) I only
(b) All
(c) V and VI
(d) III, V and VI
503: The sea territory of India extends up to:
(a) 4 nautical miles
(b) 12 nautical miles
(c) 200 nautical miles
(d) None of these
504: Which one of the following is the correct sequence of ecosystems in the order of decreasing productivity?
(a) Oceans, lakes, grasslands, mangroves
(b) Mangroves, oceans, grasslands, lakes
(c) Mangroves, grasslands, lakes, oceans
(d) Oceans, mangroves, lakes, grasslands
505: Which of the following are in Agasthyamala Biosphere Reserve?
(a) Neyyar, ldl Peppara and Shendurney Wildlife Sanctuaries; and Kalakad Mundanthurai Tiger Reserve
(b) Mudumalai, Sathyamangalam and Wayanad Wildlife Sanctuaries; and Silent Valley National Park
(c) Kaundinya, Gundla Brahmeswaram and Papikonda Wildlife Sanctuaries; and Mukurthi National Park
(d) Kawal and Sri Venkateswara Wildlife Sanctuaries; and Nagarjunasagar-Srisailam Tiger Reserve
Explanation:
The agasthyamalai biosphere is located in the Western Ghats in the south of the country. Consisting mostly of tropical forest, the site is home to 2,254 species of higher plants including about 400 that are endemic. It is also a unique genetic reservoir of cultivated plants, in particular cardamom, jamune, nutmeg, pepper and plantain. Three wildlife sanctuaries, Shendurney, Peppara and Neyyar, are located in the site, as well as the Kalakad Mundanthurai Tiger reserve.