Q 1.Consider the following effects of genetic engineering:
Disease resistance
Growth promotion
Closing
Longevity
Of these effects, those that have be entried out with a certain amount of success include
A. 1, 3 and 4
B. 2, 3 and 4
C. 1, 2 and 4
D. 1, 2 and 3
Show Answer
Answer:-D. 1, 2 and 3Explanation
Genetic engineering can have effects on many things but till now the scientists have not found any way to increase longevity by genetic engineering.
Q 2.Which of the following whales can be easily identified by the white calluses on their heads?
A. North Atlantic Right Whale
B. Antarctic Minke Whales
C. Humpback Whale
D. None of the above
Show Answer
Answer:-A. North Atlantic Right WhaleExplanation
The North Atlantic right whale is a baleen whale. At present, they are among the most endangered whales in the world. They feed on plankton and are usually found in coastal waters.
Q 3.Who proposed the model for protein synthesis
A. Ostwald Avery
B. Mclyn McCarthy
C. Colin Macleod
D. All of these
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Answer:-D. All of theseExplanation
Ostwald Avery, McLean McCarthy and Colin MacLeod proposed a model for the process of protein synthesis with the help of DNA in bacterial cells. Cell growth, synthesis of DNA, synapsis and synthesis of proteins.
Q 4.What are plants without seeds having vascular tissue?
A. Gymnosperms
B. Pteridophytes
C. Angiosperm
D. Bryophytes
Show Answer
Answer:-B. PteridophytesExplanation
Pteridophyte is a type of vascular plant, which spreads spores. Pteridophytes produce neither flowers nor seeds, they are sometimes referred to as “cryptogams”.
Q 5.Which of the following class of leucoplasts is responsible for fat storage?
A. Amyloplast
B. Proteinoplasts
C. Elaioplasts
D. Aleuroplasts
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Answer:-C. ElaioplastsExplanation
Leucoplast is colorless or non-pigmented in nature. It is used for storage. Amyloplasts store starch, proteinoplasts and aleuroplasts as well as modify proteins.
Q 6.Which of the following contains an anticodon
A. rRNA
B. mRNA
C. tRNA
D. DNA
Show Answer
Answer:-C. tRNAExplanation
An anticodon is found at one end of the transfer RNA (tRNA) molecule. During protein synthesis, each time an amino acid is added to the growing protein. A tRNA forms base pairs with its complementary sequence on the mRNA molecule and ensures that the appropriate amino acid is inserted into the protein.
Q 7.Viral nucleocapsid is a combination of __?
A. envelope and capsid
B. capsid and spikes
C. genome and capsid
D. capsomere and genome
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Answer:-C. genome and capsidExplanation
Viral nucleocapsid is a combination of genome and capsid. A virus is made up of a DNA or RNA genome inside a protein shell called a capsid.
Q 8.Which of the following may be most likely to be missing from a gram-positive bacterium?
A. Penicillin-binding protein
B. Lipopolysaccharide
C. Peptidoglycan
D. Phospholipid bilayer membrane
Show Answer
Answer:-B. LipopolysaccharideExplanation
Gram-negative bacteria are surrounded by a thin peptidoglycan cell wall. It itself is surrounded by an outer membrane containing lipopolysaccharides.
Q 9.Venation is a term used to describe the pattern of arrangement.
A. Flowers in inflorescence
B. Floral organs
C. Veins and veinlets in a lamina
D. All of these
Show Answer
Answer:-C. Veins and veinlets in a laminaExplanation
The arrangement of veins and veins on the septum of the leaf is called venation.
Q 10.Which of the following provides structural support to the plant?
A. Sclerenchyma
B. companion cells
C. lignin
D. sieve tubes
Show Answer
Answer:-C. ligninExplanation
Xylem fibers and tracheids are composed of lignin, and this provides structural support to the plant.Q 11.Which of the following is not present in animal cells?
A. Ribosomes
B. Mitochondria
C. Cell walls
D. Cytoplasm
Show Answer
Answer:-C. Cell wallsExplanation
Animal cells do not have cell walls. Cell walls are found in plant cells. Other given organelles like Mitochondria, Ribosome and Cytoplasm are present in animal cells.Q 12.Fatigue is caused because of formation and depositing of which among the following acids in Muscles?
A. Citric Acid
B. Acetic acid
C. Lactic Acid
D. Pyruvic acid
Show Answer
Answer:-C. Lactic AcidExplanation
Fatigue is caused because of formation and depositing of Lactic acid, or lactate which is a chemical by product of anaerobic respiration which is the process by which cells produce energy without oxygen around.Q 13.Which among the following are called Thrombocytes?
A. RBC
B. Platelets
C. WBC
D. Serum
Show Answer
Answer:-B. PlateletsExplanation
Thrombocytes which are also called as platelets are a component of blood whose function is to react to bleeding from blood vessel injury by clumping, thereby initiating a blood clot.Q 14.Which among the following is caused by Virus?
A. Mumps
B. Beri Beri
C. Tuberculosis
D. Dysentery
Show Answer
Answer:-A. MumpsExplanation
Mumps is caused by Virus. Mumps is a viral infection that affects the salivary glands that’s easily preventable by a vaccine. Initial signs and symptoms include fever, muscle pain, headache, poor appetite, and feeling generally unwell.Q 15.For Lemurs, which among the following is a correct group to place in ?
A. Rodents
B. Sloths
C. Bats
D. Primates
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Answer:-D. PrimatesExplanation
Lemurs are mammals of the order Primates which are native only to the island of Madagascar. They are divided into 8 families and it consists of 15 genera and around 100 existing species.Q 16.The correct group of animals that suffer from the “Foot & Mouth ” disease is as follows:
A. Only Cattle
B. Cattle & Sheeps
C. Cattle, Sheeps and Pigs
D. Cattle and Pigs
Show Answer
Answer:-C. Cattle, Sheeps and PigsExplanation
Foot and mouth disease (FMD) or hoof and mouth disease (HMD) is an infectious and sometimes fatal viral disease that affects cloven-hoofed animals. Cattle, Sheeps and Pigs are affected by the Foot & Mouth disease.Q 17. The term “Halitosis” denotes which among the following?
A. Bad hearing
B. Baldness
C. bad breathe
D. Excessive Sweating
Show Answer
Answer:-C. bad breatheExplanation
The term “Halitosis” denotes bad breath. It is the persistent, unpleasant odour in exhaled breath, usually not serious, commonly referred to as bad breath.Q 18.Overdose of antibiotics will cause the suppression of synthesis of which among the following vitamins in human body?
A. Vitamin A
B. Biotin
C. Vitamin K
D. Calciferol
Show Answer
Answer:-B. BiotinExplanation
Overdose of antibiotics will cause the suppression of synthesis biotin in human body. Biotin is also known as vitamin H, vitamin B₇ or vitamin B₈ and is involved in a wide range of metabolic processes, primarily related to the utilization of fats, carbohydrates, and amino acids.Q 19.A person with “Bombay Blood group” can receive blood from a person who is from____?
A. A Group or B Group
B. AB Group
C. O Group
D. None of them
Show Answer
Answer:-D. None of themExplanation
Bombay Blood Group is an extremely rare ABO group, called so because it was first discovered among some people in Bombay. Their red cells lack ABH antigens and their sera contain anti-A and anti-B and anti-H. The anti-H would not be detected in the ABO group but would be detectable in pretransfusion tests. People who have Bombay phenotype can donate to any member of the ABO blood group system (unless some other blood factor gene, such as Rhesus, is incompatible), but they cannot receive any member of the ABO blood group system`s blood (which always contains one or more of A and B and H antigens), but only from other people who have Bombay phenotypeQ 20.In humans, the sound is produced by the which of the following?
A. larynx
B. oesophagus
C. epiglottis
D. medulla
Show Answer
Answer:-A. larynxExplanation
The larynx is another name for the voice box. It’s a tube about 2 inches (5cm) long in adults. It sits above the windpipe (trachea) in the neck and in front of the food pipe.Q 21.Which layer of skin contains hard connective tissue?
A. epidermis
B. dermis
C. deeper subcutaneous tissue
D. All of the above
Show Answer
Answer:-B. dermisExplanation
The dermis beneath the epidermis consists of tough connective tissue, hair follicles, and sweat glands.
Q 22.Which of the following are Connective Tissues?
A. Muscle Tissue
B. Fibrous Tissue.
C. Skeletal Tissue
D. Fluid Tissues
Show Answer
Answer:-A. Muscle TissueExplanation
There are three types of connective tissue: Fluid Connective Tissue, Fibrous Conctive Tissue, Skeletal Connective Tissue
Q 23.Bipolar axons are found in __
A. Cerebral cortex
B. Embryonic stage
C. Retina of eye
D. Mesencephalon
Show Answer
Answer:-C. Retina of eyeExplanation
Bipolar neurons are located in the retina of the eye, the roof of the nasal cavity, and the inner ear.
Q 24.Which of the following are the innermost layer of the eyeball and the most delicate layer where photoreceptors are located?
A. Chloroid
B. Sclera
C. Retina
D. Cornea
Show Answer
Answer:-C. RetinaExplanation
The retina is the innermost layer of the eyeball and the most delicate layer where photoreceptors are located. The retina senses light and creates electrical impulses.
Q 25.What is different from blood in being lymph?
A. no plasma
B. more RBCs and less WBCs
C. more WBCs and no RBCs
D. plasma without proteins
Show Answer
Answer:-C. more WBCs and no RBCsExplanation
The difference between blood and lymph is that lymph, unlike blood, is colorless and is the return fluid from tissues to the central circulation.
Q 26.Complete digestion of food takes place in:
A. Stomach
B. Small Intestine
C. Pancreas
D. Large Intestine
Show Answer
Answer:-B. Small IntestineExplanation
Complete digestion of food takes place in Small Intestine. The small intestine carries out most of the digestion process, absorbing almost all of the nutrients from foods into your bloodstream.
Q 27.The undigested food stored in the liver in the form of carbohydrates is called __
A. Pulp
B. Glucose
C. Glycogen
D. Carbohydrate
Show Answer
Answer:-C. GlycogenExplanation
Glycogen is the undigested food stored in the liver in the form of carbohydrates.
Q 28.Which of the following organ is devoid of gland?
A. Oviduct
B. Vulva
C. Uterus
D. Vagina
Show Answer
Answer:-A. OviductExplanation
The oviduct is the passage in animals from an ovary. Fallopian tubes, are also known as oviducts or uterine tubes.
Q 29.A layer of cells immediately surrounding the ovum but outside the zona pellucida is called__.
A. germinal epithelium
B. corona radiata
C. theca interna
D. membrane granulosa
Show Answer
Answer:-B. corona radiataExplanation
A layer of cells immediately surrounding the ovum but outside the zona pellucida is called corona radiata.
Q 30.The ovary is suspended by which of the following?
A. fallopian tubes
B. ovarian walls
C. mesovarium
D. ligaments
Show Answer
Answer:-C. mesovariumExplanation
The ovaries are located on each side of the lower abdomen, near the kidney on its side. It is suspended from the dorsal body wall by a mesentery, called the mesovarium.Q 31.What is the renewable energy source produced by the breakdown of organic matter by some bacteria under anaerobic conditions called?
A. Bioethanol
B. Biogas
C. Biofertilizer
D. None of these
Show Answer
Answer:-B. BiogasExplanation
The renewable energy source produced by the breakdown of organic matter by some bacteria under anaerobic conditions is called Biogas. This is a mixture of methane, hydrogen, and carbon dioxide.Q 32.In which year was the first molecular biology server Expasy developed?
A. 1992
B. 1993
C. 1994
D. 1995
Show Answer
Answer:-B. 1993Explanation
In 1993, the first molecular biology server Expasy was developed. It is an extensible and integrated portal that provides access to over 160 databases and software tools.Q 33.The skin biting mosquito has legs as locomotory organ which are
____:
A. One pair
B. Two pairs
C. Three pairs
D. Four pairs
Show Answer
Answer:-C. Three pairsExplanation
Like all other insects, in a mosquito, the thorax is specialized for locomotion. Three pairs of jointed legs and a pair of wings are attached to the thorax. The insect wing is an outgrowth of the exoskeleton therefore analogous to winds of a birds.Q 34.What is Alzheimer’s disease?
A. It affects liver
B. It is a disorder of the brain
C. It affects kidney
D. It affects human immune system
Show Answer
Answer:-B. It is a disorder of the brainExplanation
Alzheimer’s disease is a progressive neurologic disease of the brain leading to the irreversible loss of neurons and the loss of intellectual abilities, including memory and reasoning. These with time become severe enough to impede social or occupational functioning. Alzheimer’s disease is also known as simply Senile Dementia.Q 35.Fat present below the skin surface in our body acts as a barrier against ____:
A. Loss of heat from the body
B. Loss of salt from the body
C. Loss of essential body fluids
D. Entry of harmful micro-organisms from the environment
Show Answer
Answer:-A. Loss of heat from the bodyExplanation
A layer of body fat acts as an insulator and traps heat. The subcutis is the deepest layer of skin. The subcutis, consisting of a network of collagen and fat cells, helps conserve the body’s heat and protects the body from injury by acting as a “shock absorber.Q 36.Which of the following are flowerless plants that produce cones and seeds in which seeds are not encased within an ovary?
A. Hydrophytes
B. Bryophytes
C. Angiosperms
D. Gymnosperms
Show Answer
Answer:-D. GymnospermsExplanation
Gymnosperm are flowerless plant that produces cones and seeds. The term gymnosperm literally means “naked seed”, as gymnosperm seed are not encased within an ovary. Rather they sit exposed on the surface of the leaf like structures called bractsQ 37.Which of the following amphibians lacks tongue?
A. Ichthyophis
B. Sphenodon
C. Salamander
D. Necturus
Show Answer
Answer:-A. IchthyophisExplanation
Ichthyophis lacks tongue. It is sometimes called the Asian caecilians. It is limbless amphibian. In Sri Lanka, three species occur. All are found in almost all habitats, but are known to prefer moist ones.Q38.The oilseed which is not edible is ____:
A. Sunflower
B. Cottonseed
C. Sesamum
D. Groundnut
Show Answer
Answer:-B. CottonseedExplanation
Cotton seed is a non-edible oilseed. Gossypol is a toxic compound found in the cotton plant. This compound is concentrated in the cotton seed but can also be found in other parts of the plant such as hulls, leaves and stems. Gossypol adversely affects the heart and liver.Q 39.Chlorophyll was first isolated and named by ____:
A. Chlorophyll
B. Pelletier
C. Caventou and Pelletier
D. Caventou
Show Answer
Answer:-C. Caventou and PelletierExplanation
Chlorophyll was first isolated and named by Joseph Bienaimé Caventou and Pierre Joseph Pelletier in 1817. It is a chemical found in the chloroplasts of plants that allows the plant to absorb light. Energy from the light is used in photosynthesis to make glucose.Q 40.A universal donor has the blood group of _____:
A. B
B. AB
C. A
D. O
Show Answer
Answer:-D. OExplanation
Individuals with type O blood are often called universal donors. They can receive blood only from a group O individual, but can donate blood to individuals of any ABO blood group (i.e., A, B, O or AB).Q 41.Which of the following is the most fatal non-infectious disease?
A. AIDS
B. Cancer
C. Diabetes
D. Obesity
Show Answer
Answer:-B. CancerExplanation
Cancer is the most fatal non-infectious disease. In cancer, some cells in the body grow uncontrollably and spread to other parts of the body.Q 42.Which of the following is an example of Phenotype?
A. Eye color
B. Sound of your voice
C. Hair color
D. All of the above
Show Answer
Answer:-D. All of the aboveExplanation
Eye color, Sound of your voice, and Hair color are examples of Phenotype. The observable physical properties of an organism are called Phenotypes.Q 43.What is Bed Method in Vermicomposting?
A. beds of organic matter are prepared
B. beds of chemicals matter are prepared
C. beds of phosphorus are prepared
D. All of the above
Show Answer
Answer:-A. beds of organic matter are preparedExplanation
In Vermicomposting, the Bed Method in which beds of organic matter are prepared.Q 44.What is the renewable energy source produced by the breakdown of organic matter by some bacteria under anaerobic conditions called?
A. Bioethanol
B. Biofertilizer
C. Biogas
D. None of these
Show Answer
Answer:-C. BiogasExplanation
The renewable energy source produced by the breakdown of organic matter by some bacteria under anaerobic conditions is called Biogas. This is a mixture of methane, hydrogen, and carbon dioxide.Q 45.The suicidal bags of the cell are____:
A. Lysosomes
B. Ribosomes
C. Phagosomes
D. Dictyosomes
Show Answer
Answer:-A. LysosomesExplanation
Lysosomes are called the suicide bags of the cells they contain digestive enzymes, and break down food, cellular debris and foreign invaders like bacteria. When the cell is injured beyond repair, or becomes old, the lysosome digests the cell. So, it is called “suicide bag of the cell.”Q 46.What is Alzheimer’s disease?
A. It affects liver
B. It affects kidney
C. It is a disorder of the brain
D. It affects human immune system
Show Answer
Answer:-C. It is a disorder of the brainExplanation
Alzheimer’s disease is a progressive neurologic disease of the brain leading to the irreversible loss of neurons and the loss of intellectual abilities, including memory and reasoning. These with time become severe enough to impede social or occupational functioning. Alzheimer’s disease is also known as simply Senile Dementia.Q 47.Which one of the following features is absent in a virus?
A. Fully parasitic in nature
B. Reproduce within host cell
C. Presence of cell wall
D. Presence of either DNA or RNA
Show Answer
Answer:-C. Presence of cell wallExplanation
A virus has a simple structure. It has no internal cellular structure, no cell wall or cell membrane, just the protein coat that holds the string of nucleic acid. It is made only of a nucleic acid + a protein coat. A cell wall is a layer located outside the cell membrane found in plants, fungi, bacteria, algae, and archaea.Q 48.What is commonly known as white plague?
A. Typhoid
B. Tuberculosis
C. Malaria
D. Plague
Show Answer
Answer:-B. TuberculosisExplanation
Tuberculosis caused by Mycobacterium tuberculie which primarily affects lungs although can affect other body too while early 19th century was called ‘white plague’ because of the large number of the people dying of its infection.Q 49.The average life span of red blood corpuscles is about ____:
A. 100 – 200 days
B. 100 – 120 days
C. 160 – 180 days
D. 150 – 200 days
Show Answer
Answer:-B. 100 – 120 daysExplanation
The red blood cells develop in the bone marrow and circulate for about 100–120 days in the body before their components are recycled by macrophages in liver and spleen (Grave yard of RBC). The old, worn out and dead RBC are destroyed mainly in an organ called spleen.Q 50.Pulses are obtained from the family of ____:
A. Liliaceae
B. Fungi
C. Leguminosae
D. Cycadaceae
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