561.
If you are provided with root-tips of onion in your class and are asked to count the chromosomes which of the following stages can you most conveniently look into A
Telophase
B
Anaphase
C
Prophase
D
Metaphase
Answer :
Metaphase
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562.
Which of the following type of plastids does not contain stored food material? A
Amyloplasts
B
Chromoplasts
C
Elaioplasts
D
Aleuroplasts
Answer :
Chromoplasts
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563.
Nuclear envelope is a derivative of : A
Membrane of Golgi complex
B
Microtubules
C
Rough endoplasmic reticulum
D
Smooth endoplasmic reticulum
Answer :
Rough endoplasmic reticulum
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564.
Tonofibrils are characteristic of which juntion A
Desmosomes
B
Plasmodesmata
C
Gap junction
D
Tight junction
Answer :
Desmosomes
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565.
In light compound microscope the power of oil immersion lens is A
10 X
B
20 X
C
45 X
D
100 X
Answer :
100 X
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566.
Lowest number of chromosomes is found in A
Radiolaria
B
Amoeba
C
Ascris meglocphala
D
Aggrgata
Answer :
Ascris meglocphala
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567.
A single unit membrane organelle is A
Ribosomes
B
Mitochondria
C
Chloropast
D
Lysosomes
Answer :
Lysosomes
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568.
Nucleotides are building blocks of nucleic acids. Each nucleotide is a composite molecule formed by A
Base - sugar - OH
B
Base - sugar - phosphate
C
Sugar - phosphate
D
(Base - sugar- phosphate)n
Answer :
Base - sugar - phosphate
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569.
Mitochondria are also called a A
Lipochondria
B
Sarcoplasm
C
Chondriosomes
D
Microbodies
Answer :
Chondriosomes
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570.
The name mitochondria was first given by A
Robert Brown
B
Benda
C
Altmann
D
L. S. Jorge
Answer :
Benda
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