sedil le@ag2013

Chemistry worksheet for grade 9

13. When laying eggs, a female insect returns to her larval host plant, even though she has not fed upon this plant during her adult life. This is an example of: A. Conditioning B. Habituation C. Instrumental learning D. A and C 14. Behavior patterns that change drastically over the lifetime of an insect are probably: A. Learned B. Innate C. Afferent D. None of the above 15. A certain insect usually becomes active each day at dusk. If kept in the dark all day, it will still become active around sunset even though it cannot see the sun. This behavior is an example of: A. Transverse orientation C. Diurnal behavior B. A circadian rhythm D. Exogenous entrainment 16. Given these terms related to negative feedback: 1. control center, 2. effector, 3. receptor, 4.response, 5. stimulus, arrange the terms in the correct order as they operate to maintain homeostasis. A. 1, 2, 3, 4, 5 C. 3, 2, 1, 5, 4 B. 2, 3, 5, 1, 4 D. 5, 3, 1, 2, 17. The mechanism of regulation of solutes and the loss and gain of water in human is known as_____________. A. Homeostasis B. Thermoregulation C. Osmoregulation D. Poikilotherms 18. What does glucagon promote in the liver? A. Hydrolysis of glycogen C. Glycogen production B. Hydrolysis of glucose D. Release of insulin 19. What is the reason why smaller mammals have higher metabolic rates? A. Higher SA:V ratios C. Lower Lifespans B. Lower SA:V ratios D. More Frequent Exposure to Predators 20. What happens when blood sugar levels become too high? A. Insulin is secreted, causing the conversion of glucose to glycogen B. Glucagon is secreted, causing the conversion of glucose to glycogen C. Insulin is secreted, causing the conversion of glycogen to glucose D. All of the above 21. Why do the hairs on our skin sometimes stand up when we are cold? A. to know when we are frightened C. to release air order to cool us down B. to trap air under them in order to keep us warmer D. to trap air under them to keep us cooler

Sedil Le Ethiopia secondary school Unit two review questions I. Multiple-choice questions Directions: Choose the correct answer for each questions 1. Which of the following is not a characteristic of animals? A. Autotrophs C. Multicellular B. Reproduce D. Heterotrophs 2. In the body organization patter of an animal, if the left and right sides of the body are mirror images of each other, it is called: A. Radial symmetry C. Bilateral symmetry B. Asymmetry D. All of the above 3. Which of the following developmental processes develop into germ layers? A. Cleavage C. Gastrula B. Blastula D. A and B 4. Which one of the following is a common characteristic of all vertebrates? A. The division of the body into a head, neck, trunk and tail B. Their bodies are covered with an exoskeleton C. The possession of two pairs of functional appendages D. The presence of a well-developed skull. 5. Why is sexual reproduction useful? A. It completes in a very short period of time B. It results in the rapid production of many offspring C. It increases genetic diversity, allowing organisms to survive in an unpredictable environment D. It needs less energy and leads to genetic variation in the offspring 6. The phenomenon by which a female gamete develops into a new organism without fertilization is called__________. A. Syngamy C. Gametogenesis B. Parthenogenesis D. Embryogenesis 7. Metamorphosis of insects is regulated through hormone A. Pheromone C. Ecdysone B. Thyroxine D. All of the above 8. Animals that have external fertilization produce a large number of gametes. What is the reason? A. They are small in size and want to produce more offspring. B. To increase chance of fertilization in water. C. Sufficient food is available in water to feed offspring. D. Water promotes production of large number of gametes 9. Which mating system involves a male mating with multiple females during a reproductive season A. Androgeny B. Monogamy C. Polygam D. Polygyny 10. The site of fertilization in the chicken is A. Uterus B. Magnum C. Infundibulum D. Ovary 11. Which of the following is called the resting and inactive stage in the insect life cycle? A. The egg stage B. The larva stage C. The pupa stage D. The adult stage 12. Insects are considered to be beneficial because they/are A. Effective pollinators C. Sources of useful products and potential protein B. Biological control agent D. All of above