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Answer keys : DT-05_Botany_XI_2019
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Question : 1 (skipped)
Each centriole in a centrosome is made up of nine
Options:
Peripheral triplets of flagellin protein
Peripheral doublets of tubulin protein
Peripheral triplets of tubulin protein
Peripheral triplets and two central singlets of microtubules
Solution :
Answer (3)
Centrioles have 9 + 0 arrangement
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Question : 2 (skipped)
An arrangement of microtubules in cilia and flagella is referred as
Options:
(9 + 2) organisation
(9 + 0) organisation
(9 + 1) organisation
(0 + 9) organisation
Solution :
Answer (1)
Fact
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Question : 3 (skipped)
The interdoublet links in eukaryotic flagellum are made up of a protein called
Options:
Nexin
Flagellin
Myosin
Actin
Solution :
Answer (1)
Fact
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Question : 4 (skipped)
The presence of radial spokes and peripheral fibrils gives a cartwheel appearance in
Options:
Centrioles
Flagella
Cilia
Both (2) & (3)
Solution :
Answer (1)
Fact
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Question : 5 (skipped)
The centre of the centriole possesses a rod-shaped proteinaceous mass known as
Options:
Hub
Diplosome
Axoneme
Microtubule generator (MTG)
Solution :
Answer (1)
Fact
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Question : 6 (skipped)
Select the correct match w.r.t. smaller subunit of ribosomes present in cytoplasm of plant cell
Options:
30 S smaller subunit - 21 protein molecules and 16 S rRNA
50 S smaller subunit - 34 protein molecules and 23 S and 5 S rRNA
40 S smaller subunit - 33 protein molecules and a single 18 S rRNA
60 S smaller subunit - 40 protein molecules and 28 S, 5.8 S and 5 S rRNA
Solution :
Answer (3)
Plant cell has 80 S ribosomes in the cytoplasm
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Question : 7 (skipped)
Ribosomes in animal cell were discovered by
Options:
George Palade, 1953
Ernst Haeckel, 1953
Richard Altmann, 1952
Christian de Duve, 1952
Solution :
Answer (1)
Fact
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Question : 8 (skipped)
Centrosome contains two cylindrical structures called
Options:
Cristae
Cisternae
Centrioles
Thylakoids
Solution :
Answer (3)
Centrioles are arranged perpendicular to each other and a pair is called DIPLOSOME.
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Question : 9 (skipped)
Which of the following statements is correct w.r.t. Ribosomes?
Options:
They are made up of RNA only
They have three subunits
They are made up of proteins only
They are known as protein factories
Solution :
Answer (4)
Site of translation (process of protein synthesis)
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Question : 10 (skipped)
The smaller sub-unit of a ribosome is found to contain 18 S rRNA. This ribosome belongs to
Options:
Bacterium
Mitochondria
Animal cell
Chloroplast
Solution :
Answer (3)
18 S rRNA is present in 40 S subunit of 80 S ribosome
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Question : 11 (skipped)
How many radial spokes and microtubules are found in an axoneme of a eukaryotic flagellum respectively?
Options:
9, 20
9, 18
18, 18
18, 20
Solution :
Answer (1)
Number of Radial spokes = 9
Number of Peripheral microtubules = 9 × 2 = 18
Number of central microtubules = 2
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Question : 12 (skipped)
Find out all the proteins that make eukaryotic flagellum
Options:
Nexin, tubulin and flagellin
Tubulin, nexin, dynein and flagellin
Actin, myosin, dynein, nexin and tubulin
Dynein, tubulin and nexin
Solution :
Answer (4)
Tubulin – Microtubules
Nexin – Radial spokes
Dynein – Helps in breaking ATP. Energy is used for movement.
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Question : 13 (skipped)
Cytoskeleton is made up of
Options:
Callose deposits
Cellulosic microfibrils
Proteinaceous filaments
Calcium carbonate granules
Solution :
Answer (3)
Cytoskeleton contains microfilaments, microtubules and intermediate filaments.
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Question : 14 (skipped)
Centrosome is required for
Options:
Replication of DNA
Photosynthesis
Formation of spindle fibres
Respiration
Solution :
Answer (3)
Spindles originate from microtubules generator present in centrosome.
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Question : 15 (skipped)
In flagella and cilia, the number of doublets present in the peripheral region of axoneme is
Options:
18
20
Solution :
Answer (3)
Number of doublets – 9
Number of microtubules in periphery → 9 × 2 = 18 and two in centre.
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