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