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