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Free Download as PDF of the detailed solutions for class 12 Biology from NCERT or CBSE text book as per exam pattern, to help you in day to day learning. We provide all important questions and answers from chapter Biotechnology Principles and Processes of Biology.
91
Crop plants grown in monoculture are
[1]
Characterized by poor root system
[2]
Free from intraspecific competition
[3]
Low in yield
[4]
Highly prone to pests
Answer: Highly prone to pests
92
Cellular totipotency is demonstrated by
[1]
All plant cells
[2]
Only gymnosperm cells
[3]
All eukaryotic cells
[4]
Only bacterial cells
93
Emasculation is related to
[1]
Clonal selection
[2]
Mass selection
[3]
Pure line
[4]
Hybridization
94
The two strands of DNA are held together by bonds of
[1]
Nitrogen
[2]
Oxygen
[3]
Hydrogen
[4]
Carbon
95
Differentiation of organs and tissues in a developing organism, is associated with
[1]
Differential expression of genes
[2]
Developmental mutations
[3]
Deletion of genes
[4]
Lethal mutations
Answer: Differential expression of genes
96
The first hormone artificially produced by bacteria is
[1]
insulin
[2]
thyroxin
[3]
adrenalin
[4]
testosterone
97
Which of the following terms is used to describe the component isolated from a plant, for in vitro culturing in the specific medium?
[1]
Synthetic seeds
[2]
Embryoid
[3]
Callus
[4]
Explant
98
There is a restriction endonuclease called EcoRI. What does "co" part in it stand for?
[1]
coli
[2]
colon
[3]
coelom
[4]
coenzyme
99
Meristem culture is practiced in horticulture to get
[1]
Slow-growing callus
[2]
Somaclonal variation
[3]
Haploids
[4]
Virus-free plants
Answer: Virus-free plants
100
The first transgenic crop was
[1]
Pea
[2]
Tobacco
[3]
Flax
[4]
Cotton
101
Nucleic acid segment tagged with a radioactive molecule is called
[1]
plasmid
[2]
probe
[3]
clone
[4]
vector
102
Micropropagation is a technique
[1]
for production of true to type plants
[2]
for production of haploid plant
[3]
for production of Somatic hybrids
[4]
for production of Somaclonal plants
Answer: for production of true to type plants
103
Genomics is the study of
[1]
Genes in general
[2]
Human genes
[3]
Genomes in general
[4]
Human genome
Answer: Genomes in general
104
Transgenic plants are developed by
[1]
Introducing foreign genes
[2]
Introducing gene mutations
[3]
Deleting certain chromosomes parts
[4]
Stopping spindle formation
Answer: Introducing foreign genes
105
Which one of the following hydrolyses internal phosphodiester bonds in a polynucleotide chain?
[1]
Exonuclease
[2]
Protease
[3]
Lipase
[4]
Endonuclease
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