Biology | Study Mode

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Question 61
A
a population 
B
a community 
C
an ecosystem 
D
a niche 
Explanation.

A community is a group or association of populations of two or more different species occupying the same geographical area and in a particular time.


Correct Option:
B
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Question 62
A
digestion of protein 
B
secretion of bile 
C
formation of urea 
D
formation of antibody 
Explanation.

Deamination is the removal of an amine group from a molecule of amino acid. The enzymes that are in general responsible for this reaction are called deaminases.In humans, deamination takes place primarily in the liver, however glutamate is also deaminated in the kidneys. In situations of excess protein intake, deamination is used to break down amino acids for energy.


Correct Option:
A
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Question 63
A
1 heterozygous smooth : 2 homozygous smooth : 1 wrinkled 
B
1 homozygous smooth : 2 heterozygous smooth : 1 wrinkled 
C
2 homozygous smooth : 2 wrinkled 
D
3 heterozygous smooth : 2 wrinkled 
Explanation.

The diagram above refers to a PUNNETT SQUARE used in predicting the probable genotypic and phenotypic ratios of a cross. looking at the diagram, we have the ratio

SS : Ss : sS : ss and from the question, we see the genotypic composition is;

1 homozygous smooth : 2 heterozygous smooth : 1 wrinkled

Bio-explained-image

Correct Option:
B
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Question 64
A
olfactory lobe 
B
optic lobe 
C
medulla oblongata 
D
pineal body 
Explanation.

the medulla oblongata is a portion of the hindbrain that controls autonomic (nervous system) functions in humans.


Correct Option:
C
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Question 65
A
use and disuse 
B
origin of species 
C
origin of life 
D
natural selection 
Explanation.

The long neck of the girraffe is an example of Lamarck's theory of use and disuse.


Correct Option:
A
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Question 67
A
pancreas 
B
iluem 
C
liver 
D
kidney 
Explanation.

The pancreas produces the hormone insulin and secretes it into the bloodstream, where it regulates the body's glucose or sugar level. The islets of Langerhans are responsible for regulating blood glucose. They are groups of specialized cells in the pancreas that make and secrete hormones.


Correct Option:
A
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Question 69
A
two different alleles 
B
four different alleles 
C
three different alleles 
D
two different genes 
Explanation.

Humans are called diploid organisms because they have two alleles at each genetic locus, with one allele inherited from each parent. A given gene may have multiple different alleles, though only two alleles are present at the genes locus in any individual.


Correct Option:
A
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Question 70
A
taeniasis and malaria 
B
cholera and gonorrhoea 
C
typhoid and syphilis 
D
dracunculiasis and haemophilia 
Explanation.

Syphilis is a bacterial infection usually spread by sexual contact. The disease starts as a painless sore typically on your genitals, rectum or mouth. . Typhoid infection is often passed on through contaminated food and drinking water, and it is more prevalent in places where handwashing is less frequent.


Correct Option:
C
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