Biology Test 1 Please don't use any search browser to find the answer. Just do it yourself so you can measure your knowledge power. Best of Luck! Please! Enter Password 1 / 50 The liver is: Smallest internal organ Medium-sized internal organ All options are incorrect Body s largest internal organ 2 / 50 Mango plant is: None of the above Mesophyte Xerophyte Hydrophyte 3 / 50 Lactic acid fermentation takes place In Heart Liver Pancreas Muscles 4 / 50 Which among the followings is not a major use of CFCs? Cleaning of computer parts Buoyancy gas for blimps and balloons Production of plastic foams Pressurizing agent in aerosol cans 5 / 50 Which of the following pollutants causes ozone holes in the ozone layer? SO2 CO2 CO CFC 6 / 50 Double helical structure of DNA was proposed by: Walther Fleming F. Miescher Watson and Crick P.A. Levene 7 / 50 Which of the following is a phase of mitosis? G0 Prophase S phase Interphase 8 / 50 What proportion of UV radiation from the sun normally absorbed by the atmospheric layer of ozone? around a quarter about half Less than 10% More than 99% 9 / 50 Ethene Triggers ripening of fruit All of the choices are correct Promotes leaf abscission Initiates flowering 10 / 50 Pseudopodia: Lock jaw A.F Huxley Amoeba Endoskeleton 11 / 50 Cell death: Klinefelter’s syndrome Necrosis Turner’s syndrome Mitosis 12 / 50 Which type of tissue enables a person’s fingers to move as he or she plays the piano? Nerve Joints Connective Muscle 13 / 50 Metabolic water is: (A) Water outside the cells of animals (B) Produced by oxidation of fats (C) Useful to desert mammals (B) and (C) 14 / 50 Turner’s syndrome Missing X Cell cleavage Diplotene Rapid division 15 / 50 Analogous structures: Have same functions but different structures Have different structures and functions None of the above Have same structures but different functions 16 / 50 Planaria has: Special cells for regeneration Differentiated cells for regeneration None of the above Undifferentiated cells for regeneration 17 / 50 What is the average weight of the human heart? 200g 250g 300g 500g 18 / 50 The interstitial cells are found: between the seminiferous tubules within the wall of epididymis lining the wall of vas deferens in the seminiferous tubules of the testes 19 / 50 Which of the followings are formed during gastrulation? Ectoderm Endoderm All of the above Mesoderm 20 / 50 During emergencies, the “fight-or-flight” response: is stimulated by cortisol is the result of aldosterone causing faster blood flow Decrease the heartrate is caused by hormone secretions in the adrenal medulla 21 / 50 The best description of when ovulation occurs in the human is: 14 days after the beginning of menstruation 14 days after the end of menstruation Exactly midway between menstrual cycles 14 days before the beginning of menstruation 22 / 50 DNA was first discovered in 1869 by: P.A. Levene Franklind Watson and crick F. Miescher 23 / 50 Excessive production of thyroid hormones by the thyroid gland: can cause stunted growth and retardation in children can cause a goiter can cause nervousness, irregular heartbeat, and weight loss is called hypothyroidism 24 / 50 The condition of small skull is: Haemophilia Cleft palate Microcephaly Polydactyl 25 / 50 Vegetative propagation does not involve: Stem parts Leaf parts Flower parts Root parts 26 / 50 Prior to maturation and ejaculation, sperms are stored in the: Epididymis Seminal vesicle Prostate gland Ejaculatory duct 27 / 50 What is the mixed gland of the human body? Thyroid Pituitary Pancreas Liver 28 / 50 A neuron with its axon connected to another neuron and its dendrites connected to a receptor: Sensory Motor Association Unipolar 29 / 50 What is a chromatid? A replicate chromosome A special region that holds two centromeres together A chromosome found outside the nucleus A chromosome in G1 of the cell cycle 30 / 50 The term niche was first proposed by: Ernst Haeckel Hardy Weinberg Charles Eton Joseph Grinnell 31 / 50 During emergencies, the “fight-or-flight” response: is stimulated by cortisol is caused by hormone secretions in the adrenal medulla is the result of aldosterone causing faster blood flow Decrease the heartrate 32 / 50 The role of cytoplasm in development is: Receives information from nucleus Turns the genes on and off Acts as template to form new structure (Does not take part in development 33 / 50 ------have a limited number of organelles? Prokaryotes None of the above organ system Eukaryotes 34 / 50 Birds maintain their body temperature within a range of: 30C to 40C 41C to 43C 36C to 38C 25C to 35C 35 / 50 The three primary soil macronutrients are: Boron, zinc and manganese Carbon, oxygen and water Potassium, phosphorus and nitrogen Copper, cadmium and carbon 36 / 50 The process by which the sperms are produced is known as: Gestation Spermatogenesis Ovulation Oogenesis 37 / 50 Which of the following traits is not sex-linked recessive? Colour blindness Haemophilia tfm syndrome Hypophosphatemic ricket 38 / 50 What is the total body weight of human skeleton? 70% 18% 40% 80% 39 / 50 Chemotherapy: High level of blood cholesterol is also done in cancer patients a condition in which liver cells lack receptor for removing cholesterol Kills the cancer cells 40 / 50 The highest part of the nervous system is: The highest part of the nervous system is: Medulla oblongata Cerebral cortex Dorsal root ganglia of thoracic nerves 41 / 50 Human chromosomes have how many nucleotides? 1000 10 140 million 40 million 42 / 50 The hormone involve in birth is: Oxytocin Thyroxin Prolactin Calcitonin 43 / 50 Glands in the endocrine system: None of the above Release hormones into the bloodstream or the fluid around cells Produce hormones that are secreted into the digestive tract Release hormones as rapidly as nerve impulses are transmitted 44 / 50 What is the risk of a colour blind child in a family when mother is colour -blind but father is normal? 25% 50% 75% 100% 45 / 50 Which one of the following structures is haploid? Sertoli cells Secondary spermatocytes Spermatogonia Primary spermatocytes 46 / 50 All other chromosomes except X and Y chromosomes are called: Monosomes Pseudosomes Autosomes Sex chromosomes 47 / 50 The allele that masks the effects of the other and the masked allele are known as: Homozygous, recessive Dominant, incomplete Homozygous, heterozygous Dominant, recessive 48 / 50 Fungi animals and plants may consist of up to? Millions of cells None of the above Trillions of cells Billions of cells 49 / 50 What is the role of progesterone hormone in women? Spermatogenesis Follicle development Development of the uterine lining Female secondary sex characteristics 50 / 50 Which stage of the human life cycle occurs first? Childhood Adulthood Puberty Adolescence Your score is 0% Restart quiz
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