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 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-2 Energy flow in ecosystem is

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

Question-3 In plant succession, when climax is reached, the net productivity.

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

Question-4 Standing crop refers to

(A) all the photosynthetic living forms in an area	(B)all the living matter in a an area
(C)the amount of living matter in a component population of an ecosystem at any time	(D)all the crop plants in an area

Question-5 Which of the following plants develop characters of xerophytes?

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

Question-6 In a lake, phytoplankton grow in abundance in

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

Question-7 Identify the plant belonging to the reed-swamp stage in hydrarch succession.

(A) Juncus	(B)Sagittaria
(C)Salix	(D)Trapa

Question-8 Pyramid that is never inverted

(A) energy	(B)mass
(C)number	(D)size

Question-9 Pyramid of energy in ecosystem is

(A) always upright	(B)always inverted
(C)mostly upright	(D)mostly inverted

Question-10 The sequence of communities showing a gradual change in composition is called

(A) continuum	(B)bio indicator
(C)succession	(D)pyramid of number

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Plus 1 Biology Science

Tamil Nadu (English Medium)

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