Home/Past Papers/KPK / ETEA/Kpk Biology 2012 Paper 2
Kpk Biology 2012 Paper 2 — Solved Past Paper with Answers
All 18 MCQs from Kpk Biology 2012 Paper 2, solved with the correct answer highlighted and a full explanation for every question. This is a free MDCAT KPK / ETEA past paper — no signup, no ads. Practise it interactively in timed mode, drill more with free MDCAT MCQs, or browse all KPK / ETEA papers.
Attempt this paper interactively →Q1. Principal nitrogenous waste product of earthworm is
- A. Ammonia and urea✓
- B. Urea and uric acid
- C. Ammonia and uric acid
- D. None of these
Explanation: The excretory product of earthworms is urea. Some amount of nitrogenous waste is also released as ammonia gas.
Why the other options are wrong
- B. The excretory product of earthworms is urea. Some amount of nitrogenous waste is also released as ammonia gas.
- C. The excretory product of earthworms is urea. Some amount of nitrogenous waste is also released as ammonia gas.
- D. The excretory product of earthworms is urea. Some amount of nitrogenous waste is also released as ammonia gas.
Q2. Geotropism is plant movement belongs to
- A. Tactic movement
- B. Autonomic movement
- C. Tropic movement✓
- D. Turgor movement
Explanation: The word tropic is derived from Greek word ‘Tropos’ meaning ‘turn’. It is the movement in curvature of whole organ towards or away from stimuli such as light, gravity, and touch.
Why the other options are wrong
- A. Tactic movement is a type of movement in plants which is directed towards (positive) or away from (negative) a stimulus. For example, phototaxis is a plant's response to light. Positive phototaxis occurs when a plant moves or orients itself towards a light source.
- B. Autonomic movement is a spontaneous movement and induced movement is a paratonic movement. - If the movement of the plant takes place spontaneously without any external stimuli. Those movements are called spontaneous movements or autonomous movements.
- D. Turgor movements in plants are often reversible and are caused by changes in the “turgor pressure” in specific cells. For example, some plants exhibit different flower positions during the day than at night, some beans, often display different leaf positions from day to night.
Q3. The second largest portion of human brain is
- A. Cerebrum
- B. Cerebellum✓
- C. Diencephalon
- D. Medulla oblongata
Explanation: The second-largest part of the brain is the cerebellum, which sits beneath the back of the cerebrum. It plays an important role in coordinating movement, posture, and balance.
Why the other options are wrong
- A. The largest part of the brain. It is divided into two hemispheres, or halves, called the cerebral hemispheres. Areas within the cerebrum control muscle functions and also control speech, thought, emotions, reading, writing, and learning.
- C. The diencephalon is involved in many crucial bodily functions including coordinating with the endocrine system to release hormones, relaying sensory and motor signals to the cerebral cortex, and regulating circadian rhythms (the sleep wake cycle).
- D. The medulla oblongata is the connection between the brainstem and the spinal cord, carrying multiple important functional centers. It is comprised of the cardiovascular-respiratory regulation system, descending motor tracts, ascending sensory tracts, and origin of cranial nerves IX, X, XI, and XII.
Q4. In corymb inflorescence the stalks of lower flowers are longer than the upper
- A. Younger ones
- B. Bigger ones✓
- C. Older ones
- D. Smaller ones
Explanation: A corymb is a raceme in which the pedicels of the lower flowers are longer than those of the upper flowers so that the inflorescence has a flat-topped appearance overall, as in hawthorn (Crataegus).
Why the other options are wrong
- A. A corymb is a raceme in which the pedicels of the lower flowers are longer than those of the upper flowers so that the inflorescence has a flat-topped appearance overall, as in hawthorn (Crataegus).
- C. A corymb is a raceme in which the pedicels of the lower flowers are longer than those of the upper flowers so that the inflorescence has a flat-topped appearance overall, as in hawthorn (Crataegus).
- D. A corymb is a raceme in which the pedicels of the lower flowers are longer than those of the upper flowers so that the inflorescence has a flat-topped appearance overall, as in hawthorn (Crataegus).
Q5. The protective coat that surrounds the embryo is known as.........
- A. None of these
- B. Chorion
- C. Allantois
- D. Amnion✓
Explanation: The amnion is a membrane that closely covers the embryo when first formed. It fills with the amniotic fluid which causes the amnion to expand and become the amniotic sac which serves to provide a protective environment for the developing embryo or fetus.
Why the other options are wrong
- A. This is incorrect.
- B. The chorion is one of the embryonic membranous structures that encloses the fetus and the amnion. The chorion begins to form chorionic villi towards its outer surface, which initially serves to provide nutrition to the developing embryo.
- C. The allantois is the embryonic precursor of the umbilical cord in mammals and is one of several embryonic regions, including the yolk sac and dorsal aorta, that undergoes vasculogenesis, the de novo formation of blood vessels.
Q6. Hibiscus and potato are the
- A. Long day✓
- B. None of these
- C. Day neutral
- D. Short day
Explanation: Four plants which are long-day plants are poppies, lettuce, potatoes, and hibiscus. The critical photoperiod of the poppy is anywhere from fourteen to sixteen hours.
Why the other options are wrong
- B. Four plants which are long-day plants are poppies, lettuce, potatoes, and hibiscus. The critical photoperiod of the poppy is anywhere from fourteen to sixteen hours.
- C. Four plants which are long-day plants are poppies, lettuce, potatoes, and hibiscus. The critical photoperiod of the poppy is anywhere from fourteen to sixteen hours.
- D. Four plants which are long-day plants are poppies, lettuce, potatoes, and hibiscus. The critical photoperiod of the poppy is anywhere from fourteen to sixteen hours.
Q7. The events that occur from zygote upto the adult condition are called
- A. Cleavage
- B. Gastrulation✓
- C. Development
- D. Embryology
Explanation: Gastrulation is an early developmental process in which an embryo transforms from a one-dimensional layer of epithelial cells, a blastula, and reorganizes into a multilayered and multidimensional structure called the gastrula.
Why the other options are wrong
- A. Cleavage is a period after fertilization, when a 1-cell embryo starts developing into a multicellular organism. It consists of a series of mitotic divisions, which divide the large volume of a fertilized egg into numerous smaller, nucleated cells—blastomeres. The pattern of cleavage divisions differs between species.
- C. Human embryogenesis is a complicated process by which a fertilized egg develops into an embryo. During the first eight weeks of development, the conceptus shifts from a single-celled zygote into a multi-layered, multi-dimensional fetus with primitively functioning organs.
- D. Embryology, the study of the formation and development of an embryo and fetus. Before widespread use of the microscope and the advent of cellular biology in the 19th century, embryology was based on descriptive and comparative studies.
Q8. Chromosome was discovered by _-
- A. T.H. Morgan
- B. Strassburger
- C. Sutton
- D. Walther✓
Explanation: It's generally recognized that chromosomes were first discovered by Walther Flemming in 1882.
Why the other options are wrong
- A. It's generally recognized that chromosomes were first discovered by Walther Flemming in 1882.
- B. It's generally recognized that chromosomes were first discovered by Walther Flemming in 1882.
- C. It's generally recognized that chromosomes were first discovered by Walther Flemming in 1882.
Q9. Criminal tendency in male may be due to genetic reason with sex chromosomal non-disjunction pattern.
- A. XYY✓
- B. XXYY
- C. XOXY
- D. XYXO
Explanation: The XYY (supermale) chromosomal syndrome may act on the brain's limbic system (which regulates man's most primitive drives, including his impulses toward violence) and somehow help trigger violent criminal acts.
Why the other options are wrong
- B. The XYY (supermale) chromosomal syndrome may act on the brain's limbic system (which regulates man's most primitive drives, including his impulses toward violence) and somehow help trigger violent criminal acts.
- C. The XYY (supermale) chromosomal syndrome may act on the brain's limbic system (which regulates man's most primitive drives, including his impulses toward violence) and somehow help trigger violent criminal acts.
- D. The XYY (supermale) chromosomal syndrome may act on the brain's limbic system (which regulates man's most primitive drives, including his impulses toward violence) and somehow help trigger violent criminal acts.
Q10. The "O" blood group persons have normally
- A. No antibodies
- B. Antibodies A&B✓
- C. Antibodies-B
- D. Antibodies-A
Explanation: O blood has neither A nor B antigen, but it does have anti - A and anti-B antibodies.
Why the other options are wrong
- A. O blood has neither A nor B antigen, but it does have anti - A and anti-B antibodies.
- C. O blood has neither A nor B antigen, but it does have anti - A and anti-B antibodies.
- D. O blood has neither A nor B antigen, but it does have anti - A and anti-B antibodies.
Q11. Which type of disease ADA is?
- A. Environmental
- B. Viral
- C. Epidemic
- D. Genetic✓
Explanation: Adenosine deaminase (ADA) deficiency is an inherited disorder that damages the immune system and causes severe combined immunodeficiency (SCID). People with SCID lack virtually all immune protection from bacteria, viruses, and fungi.
Why the other options are wrong
- A. Adenosine deaminase (ADA) deficiency is an inherited disorder that damages the immune system and causes severe combined immunodeficiency (SCID). People with SCID lack virtually all immune protection from bacteria, viruses, and fungi.
- B. Adenosine deaminase (ADA) deficiency is an inherited disorder that damages the immune system and causes severe combined immunodeficiency (SCID). People with SCID lack virtually all immune protection from bacteria, viruses, and fungi.
- C. Adenosine deaminase (ADA) deficiency is an inherited disorder that damages the immune system and causes severe combined immunodeficiency (SCID). People with SCID lack virtually all immune protection from bacteria, viruses, and fungi.
Q12. Ontogeny recapitulates phylogeny was stated by
- A. De-Vries
- B. Darwin
- C. Hackle✓
- D. Lamarck
Explanation: Haeckel formulated his theory as "Ontogeny recapitulates phylogeny". The notion later became simply known as the recapitulation theory. Ontogeny is the growth (size change) and development (structure change) of an individual organism; phylogeny is the evolutionary history of a species.
Why the other options are wrong
- A. Haeckel formulated his theory as "Ontogeny recapitulates phylogeny". The notion later became simply known as the recapitulation theory. Ontogeny is the growth (size change) and development (structure change) of an individual organism; phylogeny is the evolutionary history of a species.
- B. Haeckel formulated his theory as "Ontogeny recapitulates phylogeny". The notion later became simply known as the recapitulation theory. Ontogeny is the growth (size change) and development (structure change) of an individual organism; phylogeny is the evolutionary history of a species.
- D. Haeckel formulated his theory as "Ontogeny recapitulates phylogeny". The notion later became simply known as the recapitulation theory. Ontogeny is the growth (size change) and development (structure change) of an individual organism; phylogeny is the evolutionary history of a species.
Q13. The process in which only one partner is benefited and the other is neither
- A. Mutualism
- B. Commensalism✓
- C. Parasitism
- D. Symbiosis
Explanation: In commensalism, one organism benefits while the other organism neither benefits nor suffers from the interaction.
Why the other options are wrong
- A. Mutualism is one type of these relationships where both species involved benefit to some extent with neither species being harmed. There are several different examples of mutualistic relationships, including flowers and insects for pollination, as well as ants and aphids or Acacia for protection and food.
- C. Parasitism is generally defined as a relationship between the two living species in which one organism is benefitted at the expense of the other. The organism that is benefitted is called the parasite, while the one that is harmed is called the host. A few examples of parasites are tapeworms, fleas, and barnacles.
- D. The living together in close association of two different kinds of organisms (as a fungus and an alga making up a lichen) especially when such an association is of benefit to both. 2. : a cooperative relationship (as between two persons or groups) symbiotic.
Q14. In temperate rain forest the annual rainfall is ranging between
- A. 1500-1800mm
- B. 2000-3000mm✓
Q15. Goiter is produced by the deficiency of........
- A. Vitamins
- B. Calcium
- C. Iodine✓
- D. Iron
Explanation: Iodine deficiency is the most common cause of goiter. The body needs iodine to produce thyroid hormone.
Why the other options are wrong
- A. Vitamin deficiency can cause a number of symptoms, including fatigue, dry skin and hair, depression, poor wound healing, and more. While they can vary between deficiencies, many of them overlap. Usually, noticeable effects don't begin to develop until you've had low levels for several months.
- B. If calcium deficiency is very severe or acute there can be muscle spasm or cramping, tingling, or burning sensation around the mouth and fingers, facial spasms and tics, seizures, and tremors. The loss of calcium from bone is called osteopenia when it is mild and osteoporosis when it is severe.
- D. Without enough iron, your body can't produce enough of a substance in red blood cells that enables them to carry oxygen (hemoglobin). As a result, iron deficiency anemia may leave you tired and short of breath. You can usually correct iron deficiency anemia with iron supplementation.
Q16. Liver helps in digestion of food and the formation of
- A. Urea✓
- B. Iron
- C. Bones
- D. Muscles
Explanation: A toxic substance called ammonia is a by-product of this process. The liver cells convert ammonia to a much less toxic substance called urea, which is released into the blood. Urea is then transported to the kidneys and passes out of the body in urine.
Why the other options are wrong
- B. A toxic substance called ammonia is a by-product of this process. The liver cells convert ammonia to a much less toxic substance called urea, which is released into the blood. Urea is then transported to the kidneys and passes out of the body in urine.
- C. A toxic substance called ammonia is a by-product of this process. The liver cells convert ammonia to a much less toxic substance called urea, which is released into the blood. Urea is then transported to the kidneys and passes out of the body in urine.
- D. A toxic substance called ammonia is a by-product of this process. The liver cells convert ammonia to a much less toxic substance called urea, which is released into the blood. Urea is then transported to the kidneys and passes out of the body in urine.
Q17. Syphilis caused by
- A. E-coli
- B. Treponema pallidum✓
- C. Neisseria gonorrhea
- D. Viruses
Explanation: Syphilis is a sexually transmitted infectious (STI) disease caused by the bacterium Treponema pallidum. This bacterium causes infection when it gets into broken skin or mucus membranes, usually of the genitals. Syphilis is most often transmitted through sexual contact, although it also can be transmitted in other ways.
Why the other options are wrong
- A. Syphilis is a sexually transmitted infectious (STI) disease caused by the bacterium Treponema pallidum. This bacterium causes infection when it gets into broken skin or mucus membranes, usually of the genitals. Syphilis is most often transmitted through sexual contact, although it also can be transmitted in other ways.
- C. Gonorrhea is a sexually transmitted disease (STD) caused by infection with the Neisseria gonorrhoeae bacterium.
- D. Syphilis is a sexually transmitted infectious (STI) disease caused by the bacterium Treponema pallidum. This bacterium causes infection when it gets into broken skin or mucus membranes, usually of the genitals. Syphilis is most often transmitted through sexual contact, although it also can be transmitted in other ways.
Q18. Adenine and Guanine are...........ringed structure
- A. Single
- B. Double✓
- C. Triple
- D. None
Explanation: The purines (adenine and guanine) have a two-ringed structure consisting of a nine-membered molecule with four nitrogen atoms, as you can see in the two figures below. The pyrimidines (cytosine, uracil, and thymine) only have one single ring, which has just six members and two nitrogen atoms.
Why the other options are wrong
- A. The purines (adenine and guanine) have a two-ringed structure consisting of a nine-membered molecule with four nitrogen atoms, as you can see in the two figures below. The pyrimidines (cytosine, uracil, and thymine) only have one single ring, which has just six members and two nitrogen atoms.
- C. The purines (adenine and guanine) have a two-ringed structure consisting of a nine-membered molecule with four nitrogen atoms, as you can see in the two figures below. The pyrimidines (cytosine, uracil, and thymine) only have one single ring, which has just six members and two nitrogen atoms.
- D. The purines (adenine and guanine) have a two-ringed structure consisting of a nine-membered molecule with four nitrogen atoms, as you can see in the two figures below. The pyrimidines (cytosine, uracil, and thymine) only have one single ring, which has just six members and two nitrogen atoms.
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