Biology : One-Liner for all Competitive Exam 2025

Biology : One-Liner for all Competitive Exam 2025. Compiled from different websites for consolidated last-minute revision for all Competitive examinations

BIOLOGY SET-II

• Which is the basic unit of classification of living organisms –Species
• Insects breathe through  – Spiracles
• Deficiency of Vitamin C causes –  Scurvy
• What is saprotrophic nutrition – Organism takes food from dead and decaying matter
• Name one disease caused by bacteria    –         Diphtheria
• What is meant by dental caries     –         Tooth decay
• A jelly-like substance between the nucleus and the cell membrane is called – Cytoplasm
• Name an animal hormone  –         Prolactin
• Cell theory is not applicable to –    Virus
• DNA was discovered by     –         James D watson and Francis Crick
• Which part of desert plants such as cactus performs the process of photosynthesis  -Stem
• Which is addressed as “Alfalfa”-   Sativa
• Which part of seeds forms root on germination  –Radicle
• Which is the excretory organ of cockroaches and other insects          –Malpighian tubules
• The Causative organism of peptic ulcer is a      – Bacterium
• Which one is the largest compartment of stomach in hoofed animals        –Rumen
• What do we call the process of contraction of the cell away from the cell wall due to water loss – Plasmolysis
• Cysteine is a sulphur containing amino acid  
• Which membrane-bound sac filled with digestive enzymes –     Lysosomes
• Asexual reproduction as in the case of animal reproduces by dividing into two individuals is called – Binary fission
• Which part of a male human’s body is called the ‘Adam’s Apple’ -Larynx
• Which glands help to control blood pressure in the human body- Adrenal gland
• Gooseberry is a rich source of which vitamin –   Vitamin C
• In which phylum are the animals warm blooded           –Aves
• What is the function of phloem in plants            -It transports sugar
• Name the type of nutrition in that the organism takes in nutrient in solution form from dead and decaying matters          -Saprophytic nutrition
• There are 29 bones in the human head. Number of facial bone    -14
• In the human body, digestion of fat takes place primarily in the – small intestine
• The smallest blood vessel is called         – Capillary 
• The branch-like structure of neurons is called    – Dendrite
• Light enters the eye through the   – Cornea
• The normal systolic pressure of human blood is – 120mm Hg
• Which is the largest joint in the human body      –          Knee Joint
• Glycogen is the storage form of  Carbohydrates  in the body. 
• Leech belongs to the phylum        – Annelida
• Medicines that stop the growth of disease causing microorganisms are called – Antibiotics
• What is Karl Landsteiner known for – Discovery of blood group classification
• Which cell organelle utilizes light energy during photosynthesis        –Chloroplasts
• The concentration of carbon dioxide in the atmosphere is approximately          –  0.03%
• Name one of diseases is caused by a virus       – Chicken Pox
• Which part of the human body releases carbon dioxide, brought in by the blood, from the rest of the body         – Alveoli
• The three-carbon molecules broken down from six-carbon molecules of glucose during the first step in the process of nutrition in all organisms is called                – Pyruvate
• Which eye disorder is known as ‘lazy eye’         – Amblyopia
• The human saliva contains an enzyme called salivary  Amylase  that breaks down starch, a complex molecule, into sugar.
• The sinoatrial node is located in the        – Heart
• Study of Viruses is called   -Virology
• Scientific name of Rice      – Oryza sativa
• Red root of sugarcane is caused by fungus       -Colletotrichum falcatum
• Male reproductive part of the flower is called     – Stamens
• Female reproductive part of the flower is called – Pistil (A pistil consists of stigma, style and ovary)
• Unisexual flowers are found in      – Corn, papaya and cucumber (Flowers which contain either only pistil or only stamens are called unisexual flowers)
• Bisexual flowers are found in –      Mustard, Hibiscus, rose and petunia (Flowers which contain both stamens and pistil are called bisexual flowers)
• The excretory system of human beings includes          –a pair of kidneys, a pair of ureters, a urinary bladder and a urethra
• The blood vessel which carries oxygenated blood from the lungs to the heart is.     –  Pulmonary veins
• Blood is a      – fluid connective tissue 
• First artificially synthesized Vitamin is     – Vitamin C
• Vitamin helps immunity of body is           –Vitamin C
• Water Soluble Vitamins      – Vitamin C and Vitamin B-Complex
• Fat Soluble Vitamins          -Vitamin A, Vitamin D, Vitamin E and Vitamin K
• Animals which eat only plants are called -Herbivores
• Animals which eat only animals are called         -Carnivores
• Animals which eat both plants as well as other animals are called      – Omnivores
• Where are the sperms formed in the human body        – Testis
• Where does fertilization takes place in human beings – Fallopian tube
• Development of embryo in human body takes place in           – Uterus
• The process of the division of cell into several cells during reproduction in Plasmodium is termed as –          Multiple fission
• Movement of sunflower in accordance with the path of Sun is due to           – Phototropism
• Which plant hormone promotes cell division      – Cytokinins
• Blood vessel carrying from the lungs to the heart is     – Pulmonary vein
• The green colour of the leaves is due to the presence of – Chlorophyll
• Haemoglobin is a    – Protein
• Largest flower in the world            – Rafflesi
• Smallest flower in the world          -Wolffia
• Bile secreted by liver is normally stored in the   – Gall bladder
• which region of the alimentary canal absorbs the digested food          -Small intestine
• Which vitamin helps in coagulation of blood      – Vitamin K
• Study of newly born up to the age of 3 months is called           – Neonatology
• Which is the anticoagulant substance in blood   – Heparin
• Jaundice is a symptom of disease of       – Liver
• A Section of DNA that provides information for one protein is called as   – Gene
• Yawning occurs       – due to excess concentration of C02 in blood
• The tissue in man where no cell division occurs after birth is           – Nerves
• Pituitary gland is located in           – brain
• Functional unit of kidney is           – Nephrons
• Mendel had selected which plant for his experiment     – Pea plant
• The sex of the child is determined by the           – chromosome (XY) of the father
• Who is called the Father of Genetics       – Mental 
• House fly spreads    – Cholera
• Number of eyes in Leech is          –  Five pairs
• The process of producing energy in plants is known as -Photosynthesis
• Name the organism used in the preparation of vermicompost          – Earthworms
• Which is the smallest bone of human body        – Stapes
• Transportation of water and minerals in a plant is conducted by           – Xylem
• Universal Blood donor – O-
• who is credited with discovering Penicillin         – Alexander Fleming
• Plants producing naked seeds belong to           – Gymnosperms 
• Which mineral helps in the absorption of oxygen in the blood  Iron
• Which vitamin is also known as retinol- Vitamin A
• Vector of Kala-azar is –Sand fly
• The only bird that flies backward is –Humming bird
• Which vitamin is produced in the sun’s rays-     Vitamin D
• Which organelles is called ‘Atom bombs’-          Lysosome
• Which organelle is known as the powerhouse of the cell.-          Mitochondria
• Ginger is a modified           – stem
• The colour of human skin is produced by – Melanin
• The hardest material present in our body is       – Tooth enamel
• The basic unit of all living organisms is   -A cell
• Night blindness results from the deficiency of    – Vitamin-A
• Which one is called graveyard of RBC’s?          – spleen
• The largest organ of the human body is the       -skin
• The exchange of gases in mammals takes place in the           -alveoli
• A drop of blood contained – several million cells
• The normal body temperature of human beings is – 98.6o F
• Fish respire through their   -gills
• The connective tissue that connects a muscle to a bone is –Tendon
• Goitre is caused by the deficiency of -Iodine
• Blood group was discovered by- andsteiner
• In man, the normal number of chromosomes is            -46
• Scurvy is a disease which is caused due to the deficiency of –vitamin C
• Deficiency of vitamin D in children causes – rickets
• Which tests helps in diagnosis of cancer -Biopsy
• BOD stands for –Biochemical Oxygen Demand
• What is the nature of eye lens of human eye- Convex in nature.
• Focal length of eye lens can be adjusted by      – Ciliary muscles
• Chromosomes are made up of     – DNA  & Protein
• Archaeopteryx is a connecting link between      – Reptiles and Birds
• The famous book of Charles Robert Darwin is   -The origin of species
• Aves were evolved from     – Reptiles
• The reproduction in which the exchange genetic material of individual take place called – Sexual reproduction
• The flow of energy in an ecosystem is – Unidirectional
• The excessive exposure of humans to UV rays results in          – Skin cancer
• Order of energy flow in ecosystem is      – Sunlight → producers →herbivores → carnivores
• In the food chain, herbivores fall at         – Second trophic level
• The life process which ensures the continuity of life on earth   – Reproduction
• The production of a new organization from a single parent – Asexual reproduction
• Reproduction in which the parent organism splits to form the new organisms  –         Binary fission
• Hydra reproduces by the process of       – Budding
• Amoeba reproduces by the process of    – Binary fission
• Yeast reproduces by  -Budding
• Reproductive part of plant is         -Flower
• The anther contains – Pollen grains
• The onset menstruation in female called – Menarche
• Gestation period of human is        -280 days
• Gestation period of Elephant is     -22 months
• The stoppage of menstruation in human female is       – Menopause
• The Site of production of sperm in man   – Testis
• The fertilized egg is called as a    – Zygote.
• The age of which the sex hormones begin to be produced       – Puberty
• The first occurrence of menstruation at puberty called  –Menarche
• Surgical method of birth control in men   – Vasectomy 
• Surgical method of birth control in women         -Tubectomy
• The fertilization which occurs outside the female body – External fertilization
• Plasma without the clotting factors is called       – Serum
• The liquid part of the blood is called        -Plasma
• The red pigment in RBCs that carries oxygen is called           -Haemoglobin
• 2When the heart is relaxing, it is said to be in    – Diastole 
• When the heart is contracting it is said to be      – Systole
• The largest artery of the body is the        – Aorta
• RBCs have an average life span of         –120 days
• Leukocytes are also known as –   White blood cells (WBC)
• Erythrocytes are also known as    -Red blood cell
• The trachea divides into two smaller tubes called-          Bronchi
• The largest cartilage of the larynx is        -Thyroid
• Tooth enamel is the hardest substance found in the human body. What is it made up of         – Calcium phosphate
• The longest part of the alimentary canal is the   –Small intestine
• The site where complete digestion of carbohydrates, proteins and fats takes place is called     – Small intestine
• Blood Pressure in humans is measured using the        – Sphygmomanometer
• Information from one neuron flows to another neuron across a        –Synapse
• Plants get water through the roots as of –          capillarity
• The larvae of cockroach is called –         Nymph
• Who discovered the vaccine for small pox         – Edward Jenner
• Who is father of taxonomy –          Carl Linnaeus
• The locomotory organ of Amoeba is        – Pseudopodia
• Cells without a proper nucleus, are called as –          Prokaryotic cells
• The cells which have definite nucleus with a nuclear membrane are designated as –     Eukaryote