Biology Public Service Commission Most Repeated MCQs

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Biology MCQs Online Quiz Test With Solved Answers

Q.1: Severe deficiency of Vitamin-D results in?

1. scurvy
2. rickets
3. night blindness
4. osteomalacia

B

Q.2: People living in high altitudes (like mountains) usually have a?

1. smaller number of Red Blood Cells
2. larger number of Red Blood Cells
3. smaller number of White Blood Cells
4. larger number of White Blood Cells

B

Q.3: The average adult has a blood volume of about -------- liters?

1. 5
2. 5.5
3. 6
4. 6.5

A

Q.4: The average internal temperature of human body is?

1. 35 °C
2. 36 °C
3. 37 °C
4. 38 °C

C

Q.5: Vitamin -------- is needed for the formation of a light-sensitive pigment in the retina?

1. A
2. C
3. D
4. B complex

A

Q.6: About -------- of the body weight of a mammal is water?

1. 60%
2. 65%
3. 70%
4. 75%

C

Q.7: On wound -------- fight foreign particles, like bacteria?

1. White Blood cells
2. Red Blood Cells
3. Platelets
4. Plasma

A

Q.8: Blood is carried towards the heart by?

1. Arteries
2. Capillaries
3. Veins
4. none of these

C

Q.9: -------- is essential for the formation of haemoglobin?

1. Calcium
2. Iron
3. Water
4. Carbohydrates

B

Q.10: --------- are needed as a source of energy for the vital activities of the body?

1. Calcium
2. Iron
3. Water
4. Carbohydrates

D

Q.11: Starch is converted into maltose by?

1. diastase
2. invertase
3. maltase
4. amylase

A

Q.12: Co-enzyme is often formed from?

1. lipid
2. protein
3. inorganic ion
4. vitamin

B

Q.13: Messenger RNA is formed in?

1. nucleus
2. chloroplast
3. mitochondria
4. none of these

A

Q.14: Number of chromosomes in E.coli?

1. 4
2. 6
3. 3
4. 1

D

Q.15: Protein factory is?

1. nucleus
2. ribosome
3. golgi complex
4. centriole

D

Q.16: Smallest disease causing agents in plants are?

1. virion
2. mycoplasma
3. viroids
4. prions

C

Q.17: The major cell infected by the HIV is lymphocyte?

1. helper-T
2. B
3. both T and B
4. none of these

A

Q.18: Pigment present in red algae is?

1. fucoxanthin
2. phycocyanin
3. phycoerythrin
4. bilirubin

C

Q.19: Nutrition in fungi is?

1. photosynthetic
2. chemosynthetic
3. completely parasitic
4. absorptive heterotrophs

D

Q.20: Fungi resemble plants because they lack?

1. cell wall
2. cytoplasm
3. centriole
4. nucleus

C

Q.21: Which is a parasitic plant?

1. cuscuta
2. rose
3. ferns
4. mosses

A

Q.22: True roots absent in?

1. ferns
2. bryophytes
3. gymnosperms
4. angiosperms

B

Q.23: The mechanism for ATP synthesis is?

1. chemosynthesis
2. photosynthesis
3. phosphorylation
4. chemiosmosis

D

Q.24: Enzyme present in the saliva is?

1. lipase
2. trypsin
3. ptyalin
4. invertase

C

Q.25: Nitrogen is present in?

1. carbohydrates
2. proteins
3. lipids
4. carbonates

B

Q.26: The food is ground in the cockroach in?

1. mesenteron
2. crop
3. gizzard
4. intestine

C

Q.27: Operculum is present in?

1. bony fish
2. sea fish
3. cartilaginous fish
4. none of these

A

Q.28: In which animal respiratory surface are found in more than one organ?

1. birds
2. human
3. fish
4. frog

D

Q.29: The heart is enclosed in a membrane called?

1. pleura
2. pericardium
3. peritoneum
4. epithelium

B

Q.30: From right ventricle blood is pushed into?

1. pulmonary trunk
2. brain
3. aorta
4. body

A

Q.31: Which one is abundant in lymph?

1. oxygen
2. lipids
3. water
4. proteins

D

Q.32: Jaws without teeth are found in found in?

1. birds
2. reptiles
3. fish
4. none of these

A

Q.33: Male reproductive part of flower is?

1. stigma
2. stamen
3. carpel
4. ovule

B

Q.34: Coordination in plants is by?

1. nervous system
2. enzymes
3. hormones
4. roots

C

Q.35: The simplest fatty acid is?

1. palmitic acid
2. butyric acid
3. oleic acid
4. acetic acid

D

Q.36: All enzymes are protein which are?

1. globular
2. fibrous
3. helical
4. all of these

A

Q.37: Cilia are produced from?

1. mitochondria
2. cell-membrane
3. centriole
4. cytoplasm

C

Q.38: Which of the following disease is not caused by virus?

1. T.B
2. AIDS
3. HIV
4. flu

A

Q.39: Which of the following is a filamentous alga?

1. ulva
2. chlorella
3. acetabularia
4. spirogyra

D

Q.40: Which of the following is not sac fungi?

1. truffles
2. yeasts
3. mushrooms
4. morels

C

Q.41: ‘Cassia fistula’ is the scientific name of?

1. amaltas
2. rose
3. onion
4. tomato

A

Q.42: Phage virus consists of head and?

1. thorax
2. neck
3. tail
4. none of these

C

Q.43: Bacteria without any flagella are called?

1. monotrichous
2. atrichous
3. peritrichous
4. lophotrichous

B

Q.44: Protists have been evolved from?

1. animals
2. plants
3. fungi
4. prokaryotes

D

Q.45: Algae differ from plants in that the sex organs in algae are?

1. multicellular
2. unicellular
3. acellular
4. none of these

B

Q.46: Fungi can absorb food from the substrate because the have?

1. sporangium
2. spores
3. rhizoids
4. stalk

C

Q.47: A seed may be defined as a fertilized?

1. egg
2. ovary
3. ovule
4. embryo

C

Q.48: Platyhelminthes means?

1. round worms
2. flat worms
3. tape worms
4. pin worms

B

Q.49: The first land vertebrates were?

1. dipnoi
2. amphibia
3. reptilia
4. aves

B

Q.50: All life on planet earth is powered by?

1. solar energy
2. thermal energy
3. tidal energy
4. kinetic energy

A

Q.51: Recombinant DNA is introduced in to host cell by means of?

1. phage
2. vector
3. bacteria
4. enzyme

B

Q.52: In cystic fibrosis, the patient lacks a gene that codes for trans-membarene carrier of?

1. sodium ion
2. carbon dioxide
3. chloride ion
4. potassium ion

C

Q.53: Which gene is located on linkage group number 11 in man?

1. sickle cell anemia
2. leukemia
3. albinism
4. all of these

D

Q.54: In birds the sex is determined by the type of?

1. sperm
2. autosomes
3. egg
4. none of these

C

Q.55: In RNA nucleotides are attached by?

1. peptide bonds
2. hydrogen bonds
3. covalent bond
4. phosphodiester bond

D

Q.56: The chromosome is?

1. gene
2. genes + protein
3. DNA + genes
4. gene + protein

B

Q.57: The human body contains water?

1. 60-80%
2. 70-90%
3. 75-95%
4. 80-90%

B

Q.58: Environment is a source of?

1. food
2. shelter
3. clothing
4. all of these

D

Q.59: Fresh water ecosystem covers?

1. 2%
2. 1%
3. 3%
4. 5%

B

Q.60: Foul smell in lake is produced by?

1. algae
2. bacteria
3. fungi
4. all of these

D

Q.61: Starch is richly present in?

1. onion
2. apple
3. cereals
4. tomato

C

Q.62: Plants having foreign DNA are known as?

1. genetic plants
2. recombinant plants
3. cultured plants
4. transgenic plants

D

Q.63: Which of the following kinds of atom do not occur in carbohydrates?

1. carbon
2. hydrogen
3. nitrogen
4. oxygen

C

Q.64: The basic framework of all types of membranes are?

1. lipoproteins
2. glycoproteins
3. proteoglycans
4. nucleoproteins

A

Q.65: Single membrane bounded organelle is?

1. nucleus
2. lysosome
3. ribosome
4. none of these

B

Q.66: Irregular grape like cluster of bacilli is called?

1. diplo bacilli
2. strepto bacilli
3. staphylo bacilli
4. none of these

C

Q.67: It is generally accepted that plants arose from ancestral?

1. green algae
2. fungi
3. bacteria
4. all of these

A

Q.68: Main energy reserves in the case of green algae are?

1. glycogen
2. sucrose
3. glucose
4. starch

D

Q.69: The chief component of the cell wall of the majority of fungi is?

1. pectin
2. chitin
3. lignin
4. cellulose

B

Q.70: After pollination the pollens are transferred to which part of the flower?

1. ovary
2. style
3. stigma
4. none of these

C

Q.71: Glyoxisomes contain enzymes for?

1. glyoxylate cycle
2. glycolate cycle
3. Calvin cycle
4. none of these

A

Q.72: Vacuoles serve to?

1. expand the plant cells
2. sites for storage
3. both in expansion and storage
4. non-specific function

C

Q.73: An isolated virus is not considered living since it?

1. separate into two parts
2. cannot metabolize
3. rapidly looses its genome
4. all of these

B

Q.74: The predominant phycobilin pigment in cyanobacteria which is of blue colour is?

1. phycoerythrin
2. phycocyanin
3. fucocyanin
4. fucoxanthin

B

Q.75: Deafness is caused by misuse of?

1. penicillin
2. tetracycline
3. paracetamol
4. streptomycin

D

Q.76: Cell envelope does not include?

1. capsule
2. slime layer
3. cell wall
4. cell membrane

D

Q.77: Coenocytes is a fungal body which is?

1. multi-nucleate aseptate
2. multi-nucleate septate
3. uni-nucleate septate
4. uni-nucleate aseptate

A

Q.78: Bryophytes are?

1. all heterosporous
2. all homosporous
3. mostly homosporus
4. none of these

B

Q.79: Nephridia are excretory organs in?

1. round worms
2. lizard
3. earth worm
4. planaria

C

Q.80: Which one is harmful mollusc?

1. slug
2. snail
3. oyester
4. star fish

A

Q.81: Which structure is involve in gaseous exchange of plants?

1. stomata
2. lenticels
3. cuticle
4. all of these

D

Q.82: Common feature of human and insect trachea is?

1. non-collapsiable wall
2. supporting rings
3. ectodermal origin
4. endodermal origin

A

Q.83: Vomiting occurs due to?

1. constipation
2. diarrhoea
3. antiperistalsis
4. peristalsis

C

Q.84: Photosynthetic prokaryotes lack?

1. ribosomes
2. chloroplast
3. cell-membrane
4. vacuole

B

Q.85: Which of the following organ is because of absence of teeth in birds?

1. crop
2. syrinx
3. stomach
4. gizzard

D

Q.86: The scientific name of jelly fish is?

1. Aurelia
2. Madrepore
3. Actinia
4. Obelia

A

Q.87: In which plants leaves are always in whorls?

1. lycopsids
2. psilopsids
3. sphenopsids
4. pteropsids

C

Q.88: In bacterial and viral infection, their is increase in number of?

1. platelets
2. RBC’s
3. antibodies
4. WBC’s

D

Q.89: In plants, which are involved in testa formation?

1. tracheids
2. sclereids
3. sclerenchyma
4. none of these

B

Q.90: The etiolated plants lack?

1. chlorophyll
2. xanthophyll
3. caroteins
4. none of these

A

Q.91: Highly intelligent mammals are?

1. rat
2. bat
3. dolphin
4. elephant

C

Q.92: Plants absorb most part of water needed by them through their?

1. stem
2. root hairs
3. leaf
4. bark

B

Q.93: One of the following is not a function of bones?

1. support
2. production of blood cells
3. protein synthesis
4. muscle attachment

C

Q.94: Movement of cell against concentration gradient is called?

1. active transport
2. osmosis
3. diffusion
4. both b and c

A

Q.95: Pollination is best defined as?

1. germination of pollen grains
2. transfer of pollen from anther to stigma
3. formation of pollen grains
4. none of these

B

Q.96: DNA structure was first described by?

1. Pasteur
2. Robert Koch
3. Watson and Crick
4. Carlous Linnaues

C

Q.97: Spermology is the study of?

1. Neurogenic heart
2. Myogenic heart
3. Pulsating heart
4. Ampullary heart

B

Q.98: Spermology is the study of?

1. Seed
2. Leaf
3. Fruit
4. Pollen grain

A

Q.99: Who is known as father of Zoology?

1. Darwin
2. Aristotle
3. Lamark
4. Theophrastus

B

Q.100: The most abundant element in the Earth’s atmosphere is?

1. Oxygen
2. Nitrogen
3. Hydrogen
4. Carbondioxide
5. None of these

B