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