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The F1 of a cross between a tall and a dwarf plant was tall. The F1 was advanced to F2. How many of 120F2 plants will be dwarf?
A30
B60
C90
D120
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Question 1872
jamb1995
A man with blood group a is married to a woman with blood group A. Which of the following group combinations is possible if the family has three children?
AB, A, AB
BO, A, B
CB, AB, AB
DA, O, A
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Question 1873
jamb1995
The specific number of chromosomes in each somatic cell is represented by
A2N
B23
C2N
DN
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Question 1874
jamb1995
The DNA molecule is a chain of repeating
Anucleosides
Bnitrogenous bases
Csugar phosphates
Dnucleotides
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Question 1875
jamb1995
A person with type O blood can donate to a patient with type A because the donor's blood
Alacks antigens
Blacks anti-A antibodies
Clacks anti-B antibodies
Dhas both anti-A and anti-B antibodies
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Question 1876
jamb1995
Human height is an example of a feature which depends on both
Agenotype and phenotype
Bgenetic and environmental factors
Cmother's genotype and environmental factor
Dphenotipic and environmental factors
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Question 1877
jamb1995
Environmental pollutants which can work through the media of water, soil and air include
Acarbon monoxide
Bnoise
Csulphur(IV)oxide
Dsmoke
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Question 1878
jamb1995
Some of the diseases caused by bacteria are
Atuberculosis, gonorrhoea and syphilis
Btuberculosis, gonorrhoea and AIDS
CPoliomyelitis, syphilis and gonorrhoea
DAIDS, cholera and tuberculosis
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Question 1879
jamb1995
Which of the following is a measure for the control of bilharzia?
ACutting low brushes around homes
BApplication of molluscicides in water bodies
CScreening windows and doors with mosquito nets
DApplication of herbicides in water bodies
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Question 1880
jamb1995
Colonization of a bare rock surface is termed
Aevolution
Bspecification
Cprimary succession
Dsecondary succession
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Question 1881
jamb1995
In a tropical rain forest, non-epiphytic ferns and allies occur as
Amiddle storey species
Bupper storey species
Cshade-loving species
Demergent species
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Question 1882
jamb1995
In spite of the removal of carbondioxide from the atmosphere, its amount remains more or less constant because
Ait is produced by green plants during photosynthesis
Bit is produced during respiration of animals
Cit is absorbed inn ocean water
Dgreen plants release it during the day
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Question 1883
jamb1995
In a food chain involving a primary producer, a primary consumer as well as a secondary consumer, the sharing of trophic energy is in the form that the
Athe primary consumer has more energy than the primary poducer
Bsecondary consumer takes up all the energy contents of the primary consumer
Cenergy is shared equally between the three groups of organism
Dsecondary consumer gets only a small portion of the energy contained in the primary producer
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Question 1884
jamb1995
The depth of illumination in a water body can be measured with a
Aphotometer
Bsecchi disc
Chydrometer
Danemometer
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Question 1885
jamb1995
Which of the following ions is involved in the conduction of the nerve impulse?
ACa2+
BK+
CH+
DMg2+
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Question 1886
jamb1995
The gland directly affecting metabolic rate, growth and development is known as
Aadrenal land
Bthyroid gland
Cmammary gland
Dparathyroid gland
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Question 1887
jamb1995
The process of walking is under the control of the part of the brain called
Aoptic lobe
Bolfactory lobe
Ccerebellum
Dmedulla oblongata
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Question 1888
jamb1995
Biological growth refers strictly to an increase in the
Aprotoplasm of an organism
Bnumber of organisms
Csize of an organism
Ddevelopment of form
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Question 1889
jamb1995
The sex of a foetus is determined during
Ameiosis
Bcopulation
Cfertilization
Dplacentation
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Question 1890
jamb1995
The term caryopsis is used to describe a fruit in which the
