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Crop plants grown in monoculture are

  • low in yield

  • free from intraspecific competition

  • characterised by poor root system

  • characterised by poor root system


D.

characterised by poor root system

Monoculture involves the exclusive cultivation of a single crop over wide areas. It is an efficient way to use certain kinds of soils but the crop plants grown in monoculture are highly prone to pests and thus, it carries the risk of an entire crop being destroyed with the appearance of a single pest species or disease.

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Which one of the following is not included under in situ conservation?

  • Sanctuary

  • Botanical garden

  • Bisophere reserve

  • Bisophere reserve


B.

Botanical garden

Botanical gardens (i.e., institutions that maintain living plant collections representing a large number of speices, genera and families) are the means of ex situ conservation (i.e., conservation outside the habitats).
Insitu conservation involves the conservation of genetic resources through their maintenance within natural or even human-made ecosystems in which they occur. It includes National parks, Sanctuaries, Biosphere reserves, Natural Reserves, Natural Monuments, Cultural Landscapes etc.

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Which of the following pairs of an animal and a plant represents endangered organisms in India?

  • Bentinckia nicobarica and red panda

  • Tamarind and rhesus monkey

  • Cinchona and leopard
  • Cinchona and leopard

A.

Bentinckia nicobarica and red panda

Endangered species is a plant or animal species defined by IUCN as being in immediate danger of extinction because its members have reached a critical level or its habitals have been drastically reduced.
A plant, Bentinckia condapanna/nicobarica (member of family Arecaceae) and the animal, Red panda, both are declared as endangered in India.
Tamarind, Banyan etc are not endangered in India.

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Which one of the following is the correctly matched pair of an endangered animal and a National Park?

  • Lion — Corbett National Park

  • Rhinoceros — Kaziranga National Park

  • Wild ass — Dudhwa National Park

  • Wild ass — Dudhwa National Park


B.

Rhinoceros — Kaziranga National Park

Rhinoceros (Rhinoceros unicorns) is an endangered animal and conserved in Kaziranga National Park.

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Which one of the following is not a living fossil?

  • King crab

  • Sphenodon

  • Archaeopteryx

  • Archaeopteryx


C.

Archaeopteryx

Archaeopteryx lithographica is not a living fossil. It is a fossil bird that lived in Jurassic period about 180 million years ago. Its fossil displays the characters of both reptiles (e.g., Long tail, bones not pneumatic, jaws with teeth, fingers terminating into claw, presence of weak sternum, free caudal vertebra etc) and birds beak, fore limbs modified into wings, intimate fusion of skull bones etc.) King krab, Sphenodon and Peripatus are the living fossils.

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