Biology 2019 Jamb Examination
Biology 2019 Jamb Examination
Question 11
One of the major ways in which the blood is able to defend the body against disease causing organisms is
Blood defends the body against pathogens through processes like clumping or agglutination, which neutralizes and prevents the spread of harmful microorganisms. This immune response is a crucial protective mechanism.
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Question 12
Which of the following is not a transmitable character in plants
Haemophilia is a genetic disorder in humans, not a characteristic transmitted in plants. Plant traits like growth habit, resistance, and lifespan are inheritable and can be passed on through reproduction.
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Question 13
Inheritable character/features possessed by an organism can be referred to as
Traits are inheritable characteristics that are passed from parents to offspring. While genes are the units controlling traits, the observable features themselves are referred to as traits.
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Question 14
One of the following is a process of transmission of hereditary characteristics by chromosomes
Genes on chromosomes dictate the synthesis of specific proteins, which in turn determine hereditary characteristics. This molecular mechanism ensures that traits are reliably passed from one generation to the next.
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Question 15
The attachment of the embryo to the wall of the uterus is called
Implantation is the process by which the embryo embeds itself into the uterine lining, allowing nutrient and waste exchange with the mother, which is essential for proper embryonic development.
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Question 16
Which of the reproductive system in mammals secretes a part of the seminal fluid which raises the pH of the fluid in the female reproductive system?
The Cowper's gland secretes an alkaline fluid that neutralizes the acidic environment of the female reproductive tract, enhancing the survival of sperm and improving reproductive success.
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Question 17
The part labelled a in the above diagram is used for
The part labelled 'a' in the diagram functions in gaseous exchange, allowing oxygen to enter and carbon dioxide to leave the organism. This is essential for respiration and energy production in aquatic animals.
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Question 18
The above organism can be classified under which phylum in the animal kingdom
This organism exhibits a notochord and other chordate features, placing it in the phylum Chordata. Members of this phylum possess a dorsal nerve cord, pharyngeal slits, and post-anal tail at some stage of development.
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Question 19
One important characteristics of green plant is that they
Green plants are autotrophic, meaning they produce their own food through photosynthesis using sunlight, carbon dioxide, and water. This ability is fundamental to their survival and forms the base of most ecosystems.
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Question 20
A virus can sometimes be regarded as a living organism because it
A virus is considered living when inside a host because it can reproduce by using the host's cellular machinery. Outside the host, it remains inert and cannot carry out metabolic processes independently.
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(i) Alpha particle is positively charged
(ii) Beta particle is negatively charged
(iii) Gamma ray is neutral
(iv) Beta particle has the same mass as helium atom
(v) Gamma ray is charged.
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Choose the option that best complete the gap(s).
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In a family of eight persons, there are two couples, each having two children. B and D are brothers and each has two children. E is the aunt of A. who is the cousin brother of C. C is the sister of H, who is the cousin brother of G, F is the wife of B. How is H related to F ?