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Botany
- Online Test
TN State Board
TN 12th Standard
Botany
TEST : 29
TN State Board
TN 12th Standard
Botany
UNIT VIII: Biotechnology
Prepare / Learn
Q1.
Silencing of mRNA has been used in producing transgenic plants resistant to
A.
Boll worms
B.
Nematodes
C.
White rusts
D.
Bacterial blights
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Answer :
Option B
Explaination / Solution:
No Explaination.
TN State Board
TN 12th Standard
Botany
UNIT IX: Plant Ecology
Prepare / Learn
Q2.
The rate of formation of new organic matter by rabbit in a grassland is called
A.
net productivity
B.
secondary productivity
C.
net primary productivity
D.
gross primary productivity
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Answer :
Option B
Explaination / Solution:
No Explaination.
TN State Board
TN 12th Standard
Botany
Chapter 1: Asexual and Sexual Reproduction in Plants
Prepare / Learn
Q3.
In majority of plants pollen is liberated at
A.
1 celled stage
B.
2 celled stage
C.
3 celled stage
D.
4 celled stage
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Answer :
Option B
Explaination / Solution:
No Explaination.
TN State Board
TN 12th Standard
Botany
UNIT VII: Genetics
Prepare / Learn
Q4.
Frameshift mutation occurs when
A.
Base is substituted
B.
base is deleted or added
C.
Anticodons are absent
D.
None of these
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Answer :
Option B
Explaination / Solution:
No Explaination.
TN State Board
TN 12th Standard
Botany
Chapter 3: Chromosomal Basis of Inheritance
Prepare / Learn
Q5.
How are RNA molecules transported out of the nucleus
A.
Passive diffusion through the membrane
B.
Through membrane pores in an energy independent process
C.
Through membrane pores in an energy dependent process
D.
Through a channel in the membrane that leads to the endoplastic reticulation
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Answer :
Option C
Explaination / Solution:
No Explaination.
TN State Board
TN 12th Standard
Botany
UNIT VIII: Biotechnology
Prepare / Learn
Q6.
Some of the characteristics of Bt cotton are
A.
Long fibre and resistant to aphids
B.
Medium yield, long fibre and resistant to beetle pests
C.
High yield and production of toxic protein crystals which kill dipteran pests
D.
High yield and resistant to boll worms
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Answer :
Option D
Explaination / Solution:
No Explaination.
TN State Board
TN 12th Standard
Botany
UNIT IX: Plant Ecology
Prepare / Learn
Q7.
The second stage of hydrosere is occupied by plants like
A.
Azolla
B.
Typha
C.
Salix
D.
Vallisneria
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Answer :
Option D
Explaination / Solution:
No Explaination.
TN State Board
TN 12th Standard
Botany
UNIT VII: Genetics
Prepare / Learn
Q8.
The distance between two genes in a chromosome is measured in cross-over units which represent
A.
Ratio of crossing over between them
B.
Percentage of crossing over between them
C.
Number of crossing over between them
D.
None of these
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Answer :
Option B
Explaination / Solution:
No Explaination.
TN State Board
TN 12th Standard
Botany
Chapter 3: Chromosomal Basis of Inheritance
Prepare / Learn
Q9.
During translation the codon in mRNA is actually “read” by
A.
The A site in the ribosomes
B.
The P site in the ribosomes
C.
The anticodon in at RNA
D.
The anticodon is an amino acid
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Answer :
Option C
Explaination / Solution:
No Explaination.
TN State Board
TN 12th Standard
Botany
UNIT VIII: Biotechnology
Prepare / Learn
Q10.
An improved variety of transgenic basmati rice
A.
Does not require chemical fertilisers and growth hormones
B.
Gives high yield and is rich in vitamin A
C.
Is completely resistant to all insect pests and diseases of paddy
D.
Gives high yield but no characteristic aroma
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Answer :
Option B
Explaination / Solution:
No Explaination.
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TN State Board
TN 12th Standard
Botany
TEST : 29
Botany
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UNIT VI: Reproduction in Plants
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UNIT VII: Genetics
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UNIT VIII: Biotechnology
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UNIT IX: Plant Ecology
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UNIT X: Economic Botany
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Chapter 1: Asexual and Sexual Reproduction in Plants
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Chapter 2: Classical Genetics
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Chapter 3: Chromosomal Basis of Inheritance
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Chapter 4: Principles and Processes of Biotechnology
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Chapter 5: Plant Tissue Culture
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Chapter 6: Principles of Ecology
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Chapter 7: Ecosystem
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Chapter 8: Environmental Issues
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Chapter 9: Plant Breeding
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Chapter 10: Economically Useful Plants and Entrepreneurial Botany
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