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NEET Biology (Sept)2020 PYQs
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90 questions in NEET (Sept)2020
Match the trophic levels with their correct species examples in grassland ecosystem.
(A)Fourth trophic level
(I)Crow
(B)Second trophic level
(II)Vulture
(C)First trophic level
(III)Rabbit
(D)Third trophic level
(IV)Grass
A
(A)-(II), (B)-(III), (C)-(IV), (D)-(I)
B
(A)-(III), (B)-(II), (C)-(I), (D)-(IV)
C
(A)-(IV), (B)-(III), (C)-(II), (D)-(I)
D
(A)-(I), (B)-(II), (C)-(III), (D)-(IV)
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In relation to Gross primary productivity and Net
primary productivity of an ecosystem, which one
of the following statements is correct?
A
Gross primary productivity is always less than net primary productivity.
B
Gross primary productivity is always more than net primary productivity.
C
Gross primary productivity and Net primary productivity are one and same.
D
There is no relationship between Gross primary productivity and Net primary productivity.
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Which of the following regions of the globe exhibits highest species diversity?
A
Western Ghats of India
B
Madagascar
C
Himalayas
D
Amazon forests
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Which of the following is put into Anaerobic sludge
digester for further sewage treatment?
A
Primary sludge
B
Floating debris
C
Effluents of primary treatment
D
Activated sludge
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Montreal protocol was signed in 1987 for control
of:
A
Transport of Genetically modified organisms from one country to another
B
Emission of ozone depleting substances
C
Release of Green House gases
D
Disposal of e-wastes
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Floridean starch has structure similar to:
A
Starch and cellulose
B
Amylopectin and glycogen
C
Mannitol and algin
D
Laminarin and cellulose
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The sequence that controls the copy number of the
linked DNA in the vector, is termed:
A
Selectable marker
B
Ori site
C
Palindromic sequence
D
Recognition site
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According to Robert May, the global species
diversity is about:
A
1.5 million
B
20 million
C
50 million
D
7 million
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Which of the following is correct about viroids?
A
They have RNA with protein coat.
B
They have free RNA without protein coat.
C
They have DNA with protein coat.
D
They have free DNA without protein coat.
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Explanation: Viroids are tiny infectious agents consisting only of a short strand of RNA. They do not have a protein coat (capsid). Therefore they are naked RNA, free of any protein envelope. This matches option 2: “They have free RNA without protein coat.”
🧠 Did You Know? Viroids are smaller than viruses and affect plants by interfering with their normal metabolism, without encoding proteins.
💡 NCERT Memory Line: Viroids are naked RNA without a protein coat; they are infectious RNA particles lacking a capsid.
Some dividing cells exit the cell cycle and enter
vegetative inactive stage. This is called quiescent
stage (G0 ). This process occurs at the end of:
A
M phase
B
G1 phase
C
S phase
D
G2 phase
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