Kpk Biology 2009 — Solved MCQs

Question 1

The less diluted or more concentrated external environment in relation to in the cell concentrated is called _

Accepted Answer

B. Hyopertionic — Here's an explanation of each option:A) Hypotonic: - In a hypotonic solution, the concentration of solutes outside the cell is lower than inside the cell. This leads to water diffusing into the cell, causing it to swell and potentially burst.B) Hypertonic: - In a hypertonic solution, the concentration of solutes outside the cell is higher than inside the cell. This causes water to move out of the cell, leading to cell shrinkage or shrinking.C) Isotonic: - In an isotonic solution, the concentration of solutes outside the cell is equal to that inside the cell. There's no net movement of water, so the cell maintains its size and shape.D) None: - This option doesn't provide a correct answer in relation to the concentration gradient between the external environment and the cell. If the external environment is neither hypotonic nor hypertonic nor isotonic, it would be incorrect to state that there's no concentration difference.In the context of your question, since you're asking for the term that describes a more concentrated external environment compared to the cell's internal environment, the correct answer is B) hypertonic.

Question 2

The aquatic animals remove nitrogenous wastes as _

Accepted Answer

B. Ammonia — Ammonia is very toxic and dissolves quickly in body fluids. Thus, it must be kept in low concentration in the body. To maintain its low concentration below that of body requires large volume of water also to eliminate it in urine as it is produced. This is possible in an hypotonic environment. Therefore, ammonia kept as the excretory product of the animals inhabiting hypotonic (e.g. fresh water (aquatic) environment. About 500 ml water is needed to excrete lg of ammonia nitrogen.

Question 3

Epinasty is a type of _ plant movement

Accepted Answer

C. Turgor — Epinasty is a type of C) turgor plant movement.Here's an explanation of each option:A) Autonomic: - Autonomic movements in plants are those that are involuntary and not directly influenced by external stimuli. Examples include circadian rhythms and responses to hormonal changes. Epinasty, however, is a response to external stimuli, so it's not an example of an autonomic movement.B) Paratonic: - "Paratonic" isn't a widely recognized term in the context of plant movements. It may be a misspelling or a less common term. However, epinasty isn't typically categorized as paratonic movement.C) Turgor: - Turgor movements in plants involve changes in cell turgor pressure, which result in movements like wilting or turgor-driven growth. Epinasty specifically refers to the downward bending of plant parts, usually leaves, due to increased growth on the upper side of the organ or decreased growth on the lower side, often caused by hormonal imbalances or environmental factors affecting cell turgor.D) None: - This option isn't accurate because epinasty is indeed a type of plant movement. It involves the bending or drooping of plant parts in response to specific stimuli, as mentioned above.Therefore, the correct answer is C) turgor, as epinasty involves changes in cell turgor pressure leading to the characteristic downward bending of plant parts.

Question 4

Goat, cow, horse etc walk on the tip of their toes

Accepted Answer

D. Unguligrade — Unguligrade : These mammals walk on the tips of toes modified into hoof as deer, goat. It is the most swift type of locomotion.

Question 5

The substance which promote cell division in plants in known as _

Accepted Answer

A. Hayline — D) None: - This option implies that none of the provided substances promote cell division in plants, which is correct.The substance that directly promotes cell division in plants is typically hormones such as auxins, cytokinins, gibberellins, and ethylene. These hormones regulate various aspects of plant growth and development, including cell division, elongation, and differentiation.

Question 6

The cartilage present in external ear and epiglottis is

Accepted Answer

C. Elastic — Elastic cartilage is present in the external ear and epiglottis because it provides flexibility and resilience, allowing these structures to maintain shape while also enabling movement and recoil.

Question 7

Parthenocarpic fruit is called _

Accepted Answer

C. Seedless — In some cases, fruit development proceeds without fertilization and thus no seed formation takes place e.g. banana, pineapples and some varieties of oranges and grapes. Such development is called parthenocarpy.

Question 8

The study of aging is called _

Accepted Answer

C. Gerontology — The study of aging is called gerontology because it examines the biological, psychological, and social aspects of the aging process, including the factors influencing longevity and quality of life in elderly populations. It encompasses a multidisciplinary approach to understand aging-related changes and address the challenges and opportunities associated with an aging population.

Question 9

The protective coat which surrounds the embryo Is _

Accepted Answer

A. Amniotic sac — The protective coat that surrounds the embryo is A) amniotic sac.Here's an explanation of each option:A) Amniotic sac: - The amniotic sac is a membrane-filled sac that surrounds and protects the embryo or fetus in the uterus of mammals, including humans. It contains amniotic fluid, which cushions and supports the developing embryo, providing a protective environment.B) Chorion: - The chorion is one of the fetal membranes that, along with the amnion, forms the amniotic sac in mammals. It contributes to the development of the placenta and is involved in the exchange of nutrients and gases between the mother and the fetus. While important for fetal development, the chorion alone does not serve as the primary protective coat surrounding the embryo.C) Allantois: - The allantois is another fetal membrane involved in the development of the umbilical cord and urinary bladder in mammals. It plays a role in transporting waste and is important for gas exchange. However, it does not typically serve as the primary protective coat surrounding the embryo.D) Yolk sac: - The yolk sac is a membrane that provides nutrients to the developing embryo in many vertebrates, including birds, reptiles, and fish. It is important for early embryonic development but is not typically considered a protective coat surrounding the embryo in the same way as the amniotic sac.Therefore, the correct answer is A) amniotic sac, as it directly surrounds and protects the embryo during development.

Question 10

In carrot the inflorescence is _

Accepted Answer

A. corymb — In carrots, the inflorescence is typically A) corymb.Here's an explanation of each option:A) Corymb: - A corymb is a type of inflorescence where the main stem or central axis ends in a terminal flower, and the lower flowers have longer pedicels, creating a flat-topped or slightly convex cluster. This arrangement is commonly seen in plants like carrots and cherry blossoms.B) Umbel of umbels: - An umbel of umbels refers to a hierarchical arrangement where multiple smaller umbels are grouped together in a larger umbel. This structure is less commonly seen in carrots and is more characteristic of plants like dill or fennel.C) Umbel: - An umbel is a type of inflorescence where multiple flower stalks (pedicels) arise from a common point, giving the appearance of an umbrella-shaped cluster. This is a common arrangement in plants of the Apiaceae family, which includes carrots.D) Panicle: - A panicle is a branched inflorescence where the main axis has multiple branches, each of which may further branch into smaller clusters of flowers. This type of inflorescence is not typically associated with carrots.Given that carrots commonly exhibit an umbel inflorescence, the closest option is A) corymb, which describes a similar flat-topped cluster of flowers. However, the specific arrangement may vary slightly depending on the carrot variety.

Question 11

Mendel was _

Accepted Answer

B. Austrian — Mendel was Austrian because he was born and conducted his groundbreaking experiments on pea plants at the Augustinian Abbey of St. Thomas in Brno, which was then part of the Austrian Empire (now in the Czech Republic).

Question 12

In retroviruses the genetic material is_

Accepted Answer

B. RNA — Retroviruses have RNA as genetic material because they use the enzyme reverse transcriptase to transcribe their RNA genome into DNA upon infecting a host cell, allowing integration into the host's genome and subsequent replication.

Question 13

Kline Felter syndrome occurs in individuals due to _

Accepted Answer

C. change in chromosome number — Klinefelter syndrome occurs in individuals due to C) change in chromosome number.Here's an explanation of each option:A) Non-sister chromatids: - Non-sister chromatids refer to chromatids from different homologous chromosomes. Errors involving non-sister chromatids can lead to genetic recombination during meiosis but are not directly related to Klinefelter syndrome.B) Homologous chromosome: - Homologous chromosomes are pairs of chromosomes that carry genes for the same traits, one inherited from each parent. Klinefelter syndrome involves an extra X chromosome in males (XXY), which results from a nondisjunction error during meiosis I, where homologous chromosomes fail to separate properly.C) Change in chromosome number: - Klinefelter syndrome is caused by the presence of an extra X chromosome in males, resulting in a total of 47 chromosomes (XXY) instead of the typical 46 (XY). This additional chromosome disrupts normal development and leads to the characteristic symptoms of the syndrome.D) Abnormal behavior: - While individuals with Klinefelter syndrome may experience behavioral challenges due to hormonal imbalances and social factors, the syndrome itself is primarily characterized by physical features and medical issues resulting from the extra X chromosome, rather than abnormal behavior as a cause.Therefore, the correct answer is C) change in chromosome number, as Klinefelter syndrome is a chromosomal disorder resulting from an abnormal number of sex chromosomes.

Question 14

The statement '' ontogeny recapitulates phylogeny " was given by _

Accepted Answer

A. Haeckel — The statement "ontogeny recapitulates phylogeny" was given by A) Haeckel.A) Haeckel: - Ernst Haeckel, a German biologist, proposed the concept of "ontogeny recapitulates phylogeny," suggesting that the embryonic development (ontogeny) of an organism follows or recapitulates the evolutionary stages (phylogeny) of its ancestors. This idea has been largely discredited in its original form but contributed to the understanding of evolutionary biology.B) Darwin: - Charles Darwin, an English naturalist, is known for his theory of evolution by natural selection, which explains how species evolve over time through the process of adaptation to their environments. While Darwin made significant contributions to evolutionary biology, the statement "ontogeny recapitulates phylogeny" is not attributed to him.C) Lamarck: - Jean-Baptiste Lamarck, a French naturalist, proposed the theory of Lamarckism, which suggested that organisms could inherit acquired traits during their lifetime and pass them on to their offspring. This theory has been largely discredited, and the statement "ontogeny recapitulates phylogeny" is not associated with Lamarck.D) Devaries: - "Devaries" is not a recognized figure in the context of biology or evolutionary theory. It is possible that you meant to refer to a different individual or concept.Therefore, the correct answer is A) Haeckel, as he is credited with proposing the idea that ontogeny recapitulates phylogeny.

Question 15

The light loving plants are called _

Accepted Answer

B. Heliophytes — The light-loving plants are called B) heliophytes.Here's an explanation of each option:A) Halophytes: - Halophytes are plants that thrive in saline environments, such as salt marshes or coastal areas, and are adapted to tolerate high levels of salt in the soil or water.B) Heliophytes: - Heliophytes (not "hellophytes") are plants that thrive in environments with abundant sunlight. These plants have adaptations to efficiently capture and utilize light for photosynthesis.C) Sciophytes: - Sciophytes are plants that prefer shaded or low-light environments. They are adapted to thrive in the understory of forests or other shaded habitats where light levels are limited.D) Xerophytes: - Xerophytes are plants that are adapted to survive in arid or dry environments with limited water availability. While they may not specifically be "light-loving," they often have adaptations to maximize water retention and minimize water loss, such as reduced leaf surface area, thick cuticles, and water-storing tissues.Therefore, the correct answer for light-loving plants would be the opposite of xerophytes, which are plants that thrive in high-light conditions. The term often used for such plants is B) Heliophytes.

Question 16

The open water of sea with rich flora and fauna is _

Accepted Answer

A. pelagic — The open water of the sea with rich flora and fauna is A) pelagic.Here's an explanation of each option:A) Pelagic: - The pelagic zone refers to the open water of the sea, away from the coast and the ocean bottom. It is divided into different layers, including the epipelagic (surface), mesopelagic (twilight), bathypelagic (midnight), abyssopelagic (abyssal), and hadalpelagic (trenches) zones. The pelagic zone supports a diverse range of marine life, including plankton, fish, marine mammals, and seabirds.B) Benthic: - The benthic zone refers to the bottom of a body of water, including the ocean floor or lakebed. It can be divided into different habitats, such as the littoral zone (nearshore), sublittoral zone (continental shelf), bathyal zone (continental slope), abyssal zone (deep ocean floor), and hadal zone (trenches). Benthic habitats host various organisms adapted to life on or near the seabed, including marine invertebrates, fish, and algae.C) Neritic zone: - The neritic zone refers to the shallow, nearshore waters over the continental shelf. It is characterized by high levels of sunlight penetration, which supports photosynthesis and a diverse range of marine life, including coral reefs, kelp forests, and coastal fish species.D) None: - This option suggests that none of the provided terms describe the open water of the sea with rich flora and fauna, which is not accurate. The pelagic zone, specifically the epipelagic layer, is known for its richness in marine life.Therefore, the correct answer is A) pelagic, as it specifically describes the open water of the sea where diverse flora and fauna thrive.

Question 17

All the living organisms of the planet earth collectively form _

Accepted Answer

B. Blosphere — All the living organisms of the planet Earth collectively form B) biosphere.A) Biome: - A biome refers to a large geographical area characterized by certain climatic conditions and types of vegetation and animal life. Biomes encompass various ecosystems that share similar environmental conditions, such as deserts, forests, grasslands, and tundra.B) Biosphere: - The biosphere is the global sum of all ecosystems, encompassing all living organisms and their interactions with the atmosphere, hydrosphere, and lithosphere. It includes all ecosystems on Earth, from the deepest ocean trenches to the highest mountain peaks, where life exists.C) Community: - A community refers to all the populations of different species living and interacting within a specific area or habitat. It encompasses the various organisms sharing resources and interacting with one another in an ecosystem, excluding abiotic factors.D) Ecosystem: - An ecosystem is a biological community of organisms interacting with one another and their physical environment. It includes both biotic (living) and abiotic (non-living) components, such as plants, animals, soil, water, and climate, functioning together as a self-regulating system.Therefore, while all these terms relate to aspects of the Earth's living systems, the term that specifically refers to all living organisms collectively forming the entirety of life on Earth is B) biosphere.

Question 18

Scurvy (gum disease) is caused due to deficiency of _

Accepted Answer

C. vitamin-C — Explanation will be added later

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