Biology (9-1) - 0970 CIE

Photosynthesis (continued)

Muhtasari

Making glucose is only the start. A plant must store the sugar it does not need at once, build new cell walls, ship food to its roots and feed its flowers. And the rate at which it can photosynthesise depends on the weather: too little light, too little carbon dioxide or the wrong temperature, and the whole process slows down.

In this lesson you will learn what plants do with their glucose, why they need nitrate and magnesium ions, how to investigate the requirements and rate of photosynthesis, and, at Extended level, how to identify the limiting factor in any set of conditions.

Malengo

  1. Outline the subsequent use and storage of the carbohydrates made in photosynthesis, limited to: (a) starch as an energy store (b) cellulose to build cell walls (c) glucose used in respiration to provide energy (d) sucrose for transport in the phloem (e) nectar to attract insects for pollination
  2. Explain the importance of: (a) nitrate ions for making amino acids (b) magnesium ions for making chlorophyll
  3. Investigate the need for chlorophyll, light and carbon dioxide for photosynthesis, using appropriate controls
  4. Investigate and describe the effects of varying light intensity, carbon dioxide concentration and temperature on the rate of photosynthesis
  5. Investigate and describe the effect of light and dark conditions on gas exchange in an aquatic plant using hydrogencarbonate indicator solution
  6. [Supplement] Identify and explain the limiting factors of photosynthesis in different environmental conditions

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Maelezo ya Somo

This part of photosynthesis is heavily practical: investigations into light, carbon dioxide and chlorophyll, and the rate experiments with pond weed, come up year after year. The limiting-factor graphs are a classic Extended question, and the mineral-ion roles connect plant nutrition to proteins and chlorophyll. Mastering it ties the whole plant-nutrition section together.

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Tathmini ya Somo

Hongera kwa kukamilisha somo la Photosynthesis (continued). 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.

  1. Glucose made in photosynthesis is stored as: A. sucrose B. starch C. nectar D. protein Answer: B
  2. Nitrate ions are needed by a plant to make: A. chlorophyll B. cellulose C. amino acids and proteins D. starch Answer: C
  3. A plant with yellow leaves is most likely lacking: A. nitrate ions B. magnesium ions C. carbon dioxide D. water Answer: B
  4. On a graph, the rate of photosynthesis levels off as light increases because: A. light is still limiting B. another factor has become limiting C. the plant has died D. oxygen runs out Answer: B
  5. Sugar is transported around a plant mainly as: A. glucose B. starch C. sucrose D. cellulose Answer: C

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Vitabu Vinavyopendekezwa

Cambridge IGCSE Biology Coursebook
Cambridge IGCSE Biology Coursebook
Manukuu: Fifth edition
Mchapishaji: Cambridge University Press
Mwaka: 2021
ISBN: 978-1-108-74880-2
Maelezo: Endorsed coursebook with full coverage of the 0610/0970 syllabus, practical investigations and exam-style questions.
Cambridge IGCSE Biology
Cambridge IGCSE Biology
Manukuu: Fourth edition
Mchapishaji: Hodder Education
Mwaka: 2021
ISBN: 978-1-5104-7864-0
Maelezo: Endorsed textbook covering the Core and Supplement content with clear biological diagrams and questions.

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Ungependa kufanya mazoezi ya maswali ya majaribio kuhusu Photosynthesis (continued)? Pakua programu ya Green Bridge CBT ili kupata maswali ya majaribio na tathmini kamili za mazoezi kuhusu mada hii.

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