phenomenon of swarming occasionally occurs in some insect species‚ such as locusts. At such times locusts occur in very large numbers and they attack vegetation including crops. (i) Explain TWO consequences to a farmer if his crop is attacked by a swarm of locusts. (2 marks) (ii) Suggest why spraying with insecticide would be an ineffective method of controlling swarming locusts. (2 marks) (iii) Explain TWO methods that could be used in controlling insect pests. (4 marks) Total 20 marks 2. (a) (i)
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appear spooky‚ some hilarious. The giant canopy forms a colossal labyrinth overhead‚ which waves silently in the mild zephyr with smothered whispers that are drowned by the broken bits of squeaking by irate bats swooping overhead‚ preying on hapless insects. The place gets transformed into a pitch-black graveyard‚ except for the tiny activity in the bushes and sights of glinting eyes scampering between ones path. The crunching sound of dry twigs resounds with an enhanced pitch in the tranquil surroundings
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species‚ they can be found in Europe‚ Africa‚ southeast Asia‚ Australia‚ as well as North‚ Central‚ and South America. The Barn Owls prey on any small mammals that live in open habitats a few examples are voles‚ shrews‚ mice‚ bats‚ rats‚ birds‚ and insects such as moths are also eaten. These predators are exposed to harmful chemicals/poisons because of the prey that they eat and where their habitats are found. There are some harmful chemicals and or poisons found in the prey‚ such as DDT‚ PCBs‚
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widely and coming to dominate in the community causing economic or environmental harm. The cane toad is an example of an invasive species. It is a large‚ strong‚ and healthy amphibian that is native to Central and South America. They are predators of insects and other small prey. The cane toad was introduced to Australia in 1935. The reason that it was brought to Australia was to try to control the pest beetles that were destroying fields of sugarcane before the use of chemicals. It was a catastrophic
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According to “Why Bee Extinction Would Mean the End of Humanity” written by Ishan Daftardar‚ Not only would humans be affected but animals a well. Cattles depend on alfalfa and lupins‚ both of which depend on insect pollination. No bees‚ means no milk or meat. The extinction of bees would also affect our fuel and clothing. Canola‚ responsible for fuel and cooking oil‚ needs bee pollination. We need pollination for cotton‚ if bees become extinct our clothing choice
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study of insects and arthropods and their relation to a criminal investigation. Forensic entomology can determine the postmortem interval (PMI) or how long since the descendants’ death‚ whether the body has been moved since expiring‚ and what injuries may have been sustained. When decomposition begins‚ insects establish a colony to lay eggs on the remains; these eggs will hatch into larvae that will eat the human organs and tissues. Forensic entomologists can determine the specific insects present
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pesticide is a substance or mixture that directly or indirectly destroys‚ stupefies‚ repels‚ inhibits‚ or prevents attacks of any pest in relation to a plant‚ place or thing (Toxins). Types of pesticides include substances that kill weeds (herbicides)‚ insects (insecticides)‚ fungus (fungicides)‚ rodents (rodenticides)‚ and others (Toxins). Pesticides were created to maximize crop yields by protecting the plant from possible attackers and are composed of chemicals that are dangerous (A history). Combining
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The play entitled ‘’Insect Talk’’ focused on the Global Warming issue and how it affects our ecosystem especially to insects. After watching this play‚ some thoughts about the effects of global warming enter to my mind. The negative effects of global warming are numerous‚ and we hear about them all of the time. As the earth warms‚ insects can more easily migrate to new areas. This creates a huge problem for the local environments‚ because the animals and other insects living in the formerly
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fever and dengue cause extensive morbidity and mortality and are a major economic burden within disease-endemic countries . However‚ the use of chemical insecticides has been greatly impeded due to development of physiological resistance in the insect intermediaries ‚ environmental pollution resulting in bio-amplification of food chain contamination and harmful effects on beneficial non-target animals. In recent years‚ the increasing information on hazardous effect of synthetic insecticides
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Termites and other wood-boring bugs like carpenter ants do their dirty work behind the walls of our homes. Although we might see the swarmers‚ or reproductive termites‚ flying around during mating season‚ we rarely see the workers chomping away 24 hours a day‚ 7 days a week. Normally‚ we only know we have a termite problem when we see hollows or small‚ black holes in sheetrock or buckling wood in window or door frames. Aside from some preventative measures we can take to make our houses less appealing
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