Habitat Destruction
Muhtasari
When a forest is felled or a wetland drained, far more is lost than trees or water. Every habitat is a web of living things that depend on one another, so destroying it can topple species that never lived there directly. Habitat destruction is now the single biggest cause of falling biodiversity worldwide.
In this lesson you will define biodiversity, set out the main reasons habitats are destroyed, and see how disturbing a food web ripples outward. You will then work through deforestation as a detailed case study, explaining its undesirable effects: lost biodiversity, extinction, soil erosion, flooding and a build-up of carbon dioxide.
Malengo
- Describe biodiversity as the number of different species that live in an area
- Describe the reasons for habitat destruction, including: (a) increased area for housing, crop plant production and livestock production (b) extraction of natural resources (c) freshwater and marine pollution
- State that through altering food webs and food chains, humans can have a negative impact on habitats
- Explain the undesirable effects of deforestation as an example of habitat destruction, to include: reducing biodiversity, extinction, loss of soil, flooding and increase of carbon dioxide in the atmosphere
Somo la Sauti
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Ramani ya mawazo
Mada hii imechorwa ili uone jinsi mawazo yanavyounganika.
Fungua ramani ya mawazo kwenye programu
Kadi za kumbukumbu
Mazoezi ya haraka ya kumbukumbu kuhusu kinachopimwa katika mada hii.
Fanya mazoezi ya kadi hizi kwenye programu
Maelezo ya Somo
Dokezo Kamili la Somo Linapatikana kwenye Programu ya Green Bridge
Pata programu ya Green Bridge CBT kwenye simu au kompyuta yako kwa maktaba kamili ya IGCSE: mitihani ya miaka iliyopita, miongozo ya usahihishaji, ramani za mawazo, kadi za marudio na masomo ya sauti.
Tathmini ya Somo
Hongera kwa kukamilisha somo la Habitat Destruction. Sasa kwa kuwa umechunguza dhana na mawazo muhimu, ni wakati wa kuweka ujuzi wako kwa mtihani. Sehemu hii inatoa mazoezi mbalimbali maswali yaliyoundwa ili kuimarisha uelewaji wako na kukusaidia kupima ufahamu wako wa nyenzo.
Utakutana na mchanganyiko wa aina mbalimbali za maswali, ikiwemo maswali ya kuchagua jibu sahihi, maswali ya majibu mafupi, na maswali ya insha. Kila swali limebuniwa kwa umakini ili kupima vipengele tofauti vya maarifa yako na ujuzi wa kufikiri kwa makini.
Tumia sehemu hii ya tathmini kama fursa ya kuimarisha uelewa wako wa mada na kubaini maeneo yoyote ambapo unaweza kuhitaji kusoma zaidi. Usikatishwe tamaa na changamoto zozote utakazokutana nazo; badala yake, zitazame kama fursa za kukua na kuboresha.
- Biodiversity is defined as: A. the total number of animals in an area B. the number of different species that live in an area C. the size of the largest population D. the number of food chains Answer: B
- Which is NOT a direct effect of deforestation? A. soil erosion B. increased carbon dioxide C. increased biodiversity D. flooding Answer: C
- Deforestation increases atmospheric carbon dioxide mainly because: A. trees release carbon dioxide while alive B. fewer trees remove carbon dioxide by photosynthesis C. soil absorbs carbon dioxide D. rivers flood Answer: B
- Removing tree roots from a hillside leads to: A. less rainfall B. soil erosion and flooding C. higher biodiversity D. more nutrients in the soil Answer: B
- A reason for habitat destruction is: A. planting hedgerows B. extraction of natural resources C. creating nature reserves D. captive breeding Answer: B
Fanyia kazi maswali haya kwenye programu
Fanyia kazi maswali haya kwenye programu
Vitabu Vinavyopendekezwa
Jifunze zaidi kutoka vyanzo huria
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Sehemu ya kitabu
Threats to Biodiversity
Identify significant threats to biodiversity
"Biology: Threats to Biodiversity" by OpenStax, OpenStax, Rice University, licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Source: https://openstax.org/books/biology/pages/47-3-threats-to-biodiversity. Access for free at https://openstax.org/books/biology/pages/1-introduction
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Sehemu ya kitabu
The Biodiversity Crisis
Define biodiversity
"Biology: The Biodiversity Crisis" by OpenStax, OpenStax, Rice University, licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Source: https://openstax.org/books/biology/pages/47-1-the-biodiversity-crisis. Access for free at https://openstax.org/books/biology/pages/1-introduction
Vimechapishwa na mashirika mengine chini ya leseni huria na vinatajwa kama wanavyoomba. Viungo hufungua tovuti zao.
Fanya Mazoezi ya Maswali ya Majaribio
Ungependa kufanya mazoezi ya maswali ya majaribio kuhusu Habitat Destruction? Pakua programu ya Green Bridge CBT ili kupata maswali ya majaribio na tathmini kamili za mazoezi kuhusu mada hii.
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Kila kitu unachohitaji ili kufaulu katika JAMB, WAEC & NECO.
