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