Tamil Nadu (English Medium) Plus 1 Biology Science Study Materials, Online Learning, Question Papers, Classnotes, Practice Test, MCQ | Smartindia Educational Program : www.smartindia.net.in

Question-1 In plant succession, when climax is reached, the net productivity.

(A) Continues to increase	(B)becomes halved
(C)become stable	(D)becomes zero

Question-2 Community is a group of independent and interacting population of

(A) different species	(B)same species
(C)same species	(D)different species in a specific area

Question-3 Actively moving organisms in aquatic ecosystem are

(A) nekton	(B)benthos
(C)viruses	(D)none of these

Question-4 Which of the following plants develop characters of xerophytes?

(A) Heliophytes	(B)Sciophytes
(C)Hydrophytes	(D)Halophytes

Question-5
Lichen is the pioneer vegetation in which succession?

(A) Hydrosere	(B) Lithosere
(C) Psammosere	(D) Xerosere

Question-6 Niche is defined as the

(A) position of species in a community in relation to other species.	(B)place where organism lives
(C)place where organism lives and its functional role	(D)place where population perform their duties.

Question-7 Primary consumers are

(A) carnivores	(B)herbivores
(C)decomposers	(D)omnivores

Question-8 Energy flow in ecosystem is

(A) bidirectional	(B)unidirectional
(C)all around	(D)none of these

Question-9 In a grazing food chain carnivores may also the referred to as

(A) primary producers	(B)secondary producers
(C)primary consuemrs	(D)secondary consumers

Question-10 In a lake, phytoplankton grow in abundance in

(A) littoral zone	(B)limnetic zone
(C)profundal zone	(D)benthic region

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Plus 1 Biology Science

Tamil Nadu (English Medium)

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