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Showing posts with label Teachers. Show all posts
Showing posts with label Teachers. Show all posts

Saturday, June 15, 2024

SPECIAL FEATURE-PHOTOSYNTHESIS

 PHOTOSYNTHESIS AND WHY IT IS IMPORTANT

Photosynthesis and Why it is Necessary

Photosynthesis is a critical process that sustains plants by enabling them to produce food. It is a process by which plants, algae and some types of bacteria use energy from the sun, water and carbon dioxide to produce food (glucose) and oxygen. This article gives important insights into an exciting process called photosynthesis and its role in supporting plant growth and development.

Components Needed for Photosynthesis to Take Place

  1. Sunlight
  2. Chlorophyll
  3. Chloroplasts
  4. Water
  5. Carbon Dioxide

Photosynthesis Equation

6CO2 +6H2O + Light Energy =>C6H12O6+6O2

 

Photosynthesis Defined

Photosynthesis revolves around chlorophylls. These are molecules present in the chloroplasts of plant cells. Chlorophyll has a powerful function of harvesting light through its antenna that plays an essential role in energy capture from light (National Geographic, n.d.). This light energy then triggers a number of processes within the chloroplasts of the plant cells. This causes the water molecules to split and oxygen is released in the process, simultaneously, carbon dioxide is removed from the atmosphere (Spanner, 2022). These components are then assimilated using the energy from sunlight to manufacture glucose, a simple sugar that promotes plant growth and development.

The photosynthesis process occurs in two stages: The first process known as the light dependent reactions or the light dependent stage and the second process known as the light independent reactions or the Calvin cycle (National Geographic, n.d.). Light dependent reactions involve the absorption of light and the energy produced is used to produce ATP and NADPH which are energy transport compounds in the cell. These energy carriers then fuel the Calvin cycle where carbon dioxide that has been fixed is used to synthesize glucose.

Roles of Photosynthesis

Photosynthesis is the most vital process in the continuation of plant life. It is the primary means of nutrition for most living organisms either in the natural or in the modified form (Spanner, 2022). While herbivores consume plants, carnivores, on the other hand, consume herbivores. Carnivorous animals consume dead plants and animals and thus enhance the recycling of nutrients in the ecosystem. Such an intricate web of existence requires an ongoing production of food by photosynthetic organisms.

In addition, photosynthesis preserves the earth’s atmosphere by reducing the amount of carbon dioxide in it, thus reducing global warming. As it removes carbon dioxide, a gas that has an effect of creating a green house, photosynthesis produces oxygen, which animals require for breathing (National Geographic, n.d.). Photosynthesis is also the source of energy needed for plant growth.

Conclusion

Photosynthesis is one of the most significant processes for the life existence on our planet. This fantastic process allows the plants to convert energy from the sun into food for the plants and other living things that feed on the plants hence placing them at the bottom of the food chain. It also balances oxygen and carbon dioxide in the atmosphere, which is crucial in protecting the universe against global warming or climate change.

References

National Geographic. (n.d.). Photosynthesis. https://education.nationalgeographic.org/resource/photosynthesis/

Spanner, H. (2022, July 27). Photosynthesis: What is it and how does it work? BBC Science Focus Magazine. https://www.sciencefocus.com/nature/how-does-photosynthesis-work

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Tuesday, April 14, 2020

THE PEOPLE OF KENYA UP TO THE 19TH CENTURY

Background to the people of Kenya
The earliest inhabitants of Kenya are believed to be the Khoisan i.e. the San and Khoikho (Bushmen) of southern African. 


The remnants of these groups are the: /Earliest inhabitants of Kenya Included:

  •  Nguye, Okuro of western Kenya, 
  • Dorobo/Athi/Ogiek of Kenya
  • Hadza and Sandawe of Tanzania.
Evidences that proved to have been inhabited by humankind as far back as two million years ago or earlier
§  Tools attributed to Homo habilis were found in Koobi Fora near Lake Turkana.
§  Hand axes, cleavers and other tools attributed to Homoerectus have been found at Olorgesailie near Lake Magadi, Mtongwe near Mombasa, around lakes Victoria and Turkana and at Kariandusi.
§  Tools associated with the late Stone age such as the Crescent, arrowheads, pottery, bone harpoons and ornamental egg shells have been found near lake Naivasha, lake Nakuru, Lukenya hills and Athi river.
§  Microlith tools, axe heads, polished stones, stone bowels, platters and grinding stones have been discovered all over Kenya.
§  Iron was used as far back as 270AD. Evidence of iron use have been found at Urewe near Ng’iya in Siaya and in Kwale at the coast.
§  Animals such as cattle, sheep and goats were domesticated in Kenya during the late stone age.

Lifestyle of the earliest inhabitants of Kenya
§  Their language resembled that of the Khoisan.
§  They originally were nomadic peoples.
§  They gathered fruits and dug up tubers and roots to supplement their diet.
§  They used stone tools, bows and arrows.
§  They fished in rivers and lakes, using harpoons.
§  They lived in rock shelters and caves.
§  They made and used pottery.
§  They buried or cremated their dead.
§  Because of their nomadic lifestyle, they lived in seasonal camps and had no permanent homes.
§  Being hunter-gatherers, they were very few, with very few belongings i.e. a variety of stone tools, bows and arrows.
§  By the 7th century BC, they had learnt and practised fishing. They started living in semi permanent homes of rock shelters and caves.
§  After acquiring the skill of food production, they settled down in more permanent homes and owned more materials such as grinding stones, pestles and stone bowels, pots and calabashes.
§  They kept humpless long-horned cattle and grew food-crops like sorghum and millet.
§  They passed on many customs such as circumcision, age-set organization, the taboo against eating fish, etc. There was a lot of cultural exchange between them and the new comers.

    NB:These early inhabitants of Kenya may have been subdued by other stronger peoples, particularly the Bantu and the Nilotes through intermarriage, assimilation and war.

Some remnants of these early inhabitants speak the languages of the groups near or with whom they live. E.g.  some speak Kikuyu while others speak Olmaa: the language of the Maasai. A majority of them speak Kalenjin dialects. The Kalenjin refer to them as Okiek while the Maasai call them Dorobo. In western Kenya, the Nguye and Okuro were totally assimilated by the Luo and Bantu groups.


QUIZ: Name three linguistic groups in Kenya. (3 marks)


Linguistic groups in Kenya

  1. The Bantu
  2. The Nilotes
  3. The Cushites
NB:-BANTU is the largest linguistic group in Kenya.
        CUSHITESis the smallest language group in kenya.


QUIZ: Give three ways in which Kenyan communities interacted. (3 marks)


  1. Trade
  2. Warfare
  3. Intermarriage
  4. Sports

Origin of the people of Kenya

The Bantu -Their original homeland was somewhere between eastern Nigeria and the Cameroon (Congo Basin).. They first settled on the Congo forest.
The Nilotes originated in the Sudan.
The Cushites originated from Horn of Africa.

MIGRATION AND SETTLEMENT OF THE PEOPLE OF KENYA

The Bantu

They had a similar sound of the root word for people has a ‘ntu’, ‘ndu’, ‘tu’ and the names of livestock are alike. 


The Bantu are the largest group in Kenya and are divided into two groups viz:
Western Bantu and Eastern Bantu based on how they entered Kenya. 


NB: The Bantu-speaking groups include the Luhyia, Kisii, Kuria, Kikuyu, Akamba, Meru, Aembu, Taita, Agiryama, Digo in Kenya and Pokomo, as well as many other smaller groups.

                                  
QUIZ: Name two classifications/ groups of the Bantu.

  • Western Bantu- Luhyia, Kisii, Kuria and abasuba and settled in western part of kenya thus their name.
  • Eastern Bantu                                                          

FACTORS/REASONS FOR MIGRATION OF THE BANTU

2004 18. (a) Why did the Bantu migrate from their original homeland? (5 mks)
i.        There was an increase in population thus the need for land for settlement
ii.        They were looking for land for cultivation
iii.        They needed land for grazing/ pasture
iv.        Internal conflicts forced them to migrate
v.        They were attacked by neighbouring communities/ external attacks
vi.        Outbreak of diseases led to migration/ outbreak of epidemics
vii.        They migrated due to drought and famine
viii.        Some people migrated for the sake of adventure    
ix. Group influence: Some moved because they had seen their relatives and friends move.
x. Need for water and pasture for their animals forced them to move.
xi. The Bantu migrated in order to export their iron-working culture.   ( 5 x 1 = 5 mks)

WESTERN BANTU

They include,
*       Abasuba-Suba
*       Abaluyia-Luhya
*       Abakuria-Kuria
*       Abagusii-Kisii

1999 5.  Name two Bantu communities in Kenya whose ancestors settled in the Mount Elgon area before migrating to their present homeland. (2 mks)
i.        Abagusii
ii.        Abakuria
iii.        Abaluyia/ any Abaluyia speaking group

2012 3. Name two Bantu groups in Kenya which settled in Mount Elgon area before migrating to their present homeland.                                 (2 marks)
(i)    Abaluhya
(ii)  Abagusii
(iii)    Abakuria

ABALUHYA
*       Luhyia oral tradition traces their origin to an area called Misiri. Historical evidence shows that Abaluhyia resulted from intermarriage between various ethnic groups in the course of their migration into Kenya. Buluhyia is an area in which Nilotes, Bantu and some Cushites interacted.
*       Luhyia migration and settlement into Kenya started around 300AD. Their most recent ancestors spread from Eastern Uganda from around 1300AD. Most of them may have originated from the mount Elgon region and then settled in Bukhayo, Marama, Tiriki, Bunyore, Wanga, Maragoli, Marachi, Kisa, Samia, Idakho, Isukha, Bungoma and other Bukusu areas, Bunyala, Busonga, etc.
*       As they migrated, they assimilated other groups, such as the southern and Eastern Cushites as well as Southern Nilotes.
*       Between 1550-1750AD, Luhyia society began to take shape. By 1883, Abaluhyia had fully emerged as a community.
*       Abaluhyia interacted with Nilotic speakers such as the Maasai, Kalenjin and Luo, which led to a lot of cultural exchange.
*       The interaction of Abaluhyia with several other communities perhaps explains why there exists so many clans and dialects among Abaluhyia. In fact, the term Luhyia means Family. Abaluhyia means People Of the Family or Family-people.

Eighteen major dialects constitute Abaluhyia.
*       Tiriki, *       Maragoli,
*       Isukha, *       Idaho,
*       Banyore, *       Kisa,
*       Batsotso, *       Marama,
*       Wanga, *       Banyala,
*       Batura, *       Kabarasi,
*       Bukusu, *       Tachoni,
*       Khayo, *       Marachi,
*       Basonga, *       Samia.

Each of these dialects consists of several clans and tended to exist independently, through remotely connected ties to the rest of Abaluhyia. In fact, Abaluhyia were constituted as a community in 1947, when the British colonial government administered all these Luhyia dialects as a single entity.

THE ABAGUSII
*       Abagusii may have originated from a place known to them as Misiri, under their ruler and ancestor called Kwitu.
*       From Misiri, Abagusii and some Abaluhyia groups migrated to the Mount Elgon region where they lived for several generations.
*       Around 1500AD, Abagusii, Abakuria and a section of Abalogoli migrated down Nzoyia river valley and settled at Goye in Yimbo and near Ramogi hill and other areas on the Eastern shores of lake Victoria.
*       Due to arrival of Luo Ancestors In the lake region around 1550AD, Abagusii were pushed to Alego, Kisumu, and Sakwa and Asembo areas.
*       Shortly after 1600AD, drought forced Abagusii to migrate and settle in the Kano plains. Their farther migration Eastwards brought them into conflicts with the Kipsigis. Because of this, they moved to the fertile Kisii highlands and other parts of their present homeland, such as Kitutu, South Mugirango and others.
*       In spite of conflicts with the Luo, Maasai and Kipsigis, Abagusii exhibited and practised good interaction, due to which they intermarried, traded and had other forms of exchange with these communities.

THE ABAKURIA
*       Abakuria live in south Nyanza. Their traditions indicate that they are related to the Abalogoli of Abaluhyia and Abagusii too.
*       They also trace their origin to the Mount Elgon region and maintain that they came from a place called Misiri.
*       They moved through chepalungu, Lolgorien and settled in kurialand  between 1580 and 1660 A.C.E.
*       Abakuria may have migrated alongside Abagusii up to 1500AD when they took their separate direction.
*       Abakuria settled briefly around the shores of Lake Victoria, where they interacted with the Luo and the Southern Cushites. Abakuria may have picked up the practice of circumcision and Age-set organization from the Southern Cushites.
*       Some of the Kuria clans may have come from northern Tanzania. e.g. abairegi from musoma.
*       By 1800AD, Abakuria had all settled in south Nyanza, where they again met and continued interacting with Abagusii. Indeed, some clans of Abagusii originally settled in Kuria territory in the second half of the 18th century.

Kuria clans included

  • ·       Abairegi
  • ·       Abagumbe
  • ·       Abahirichacha
  • ·       Wasimbete
  • ·       Abanyabasi
  • ·       Watobori
  • ·       Abakira
  •            
  • THE ABASUBA
*       Abasuba occupy Mfangano and Rusinga islands on lake Victoria, where they settled from 1750AD, after arriving as refugees fleeing from Buganda. Other Suba people were displaced by the incoming Luo.
*       Suba migration was mainly triggered by fighting in Buganda and Busoga, following the assassination of Kyabbagu by some of his children. Kyabbagu was King of Buganda. As a result of the assassination, there was a struggle for succession to the throne, which made some of the groups around Lake Victoria to flee.
*       In their migration from Busoga and Buganda, most of the Suba spoke either Luganda or lusoga.
*       The Suba later interacted with the Luo as they entered Kenya, although they at first saw the Luo as a threat to them. They traded and intermarried with the Luo among other practices.
*       Some Abasuba settled at Gwasi and Kaksingiri in later years. They adopted the social customs of the Luo. Today, most Abasuba have adopted Luo culture and language.
*       Because of Luo influence, Abasuba have almost lost their original language and way of life.


QUIZ: Name the main social aspect that the Abasuba aquired from the Luo as a result of assimilation by the Luo. (1 mark)

          -The Luo language

EASTER BANTU

They are divided into two ie

  •  Coastal Bantu 
  • Highland Bantu.

Coastal Bantu

They include the following:
·       Mijikenda, ·       Pokomo, ·       Taita

From the west Victoria dispersal point their first movement was upto Taita hills, where the Taita remained. The Mijikenda and Pokomo proceeded northwards to the coast upto Shungwaya (another dispersal point). The main reason for the Shungwaya dispersal was the Oromo attack In AD 1600.


QUIZ: Name two dispersal points of the Coastal Bantu. (2 marks)


  • West Victoria
  • Shungwaya
Mijikenda
Mijikenda is a Kiswahili word that means nine clans. The Mijikenda comprise the nine communities that originally inhabited the nine settlements called Kaya in the immediate coastal hinterland.


By the 19th, the Mijikenda were established as middlemen during the long distance trade between the Akamba and the coastal Waswahili.


The 9 Communities the constitute the Mijikenda
*       The Giriama,
*       Kauma,
*       Chonyi,
*       Kambe,
*       Ribe,
*       Jibana,
*       Rabai,
*       Duruma,
*       Digo.


QUIZ: Give reason why the Mijikenda lived in KAYAs/ Fortified villages (1 mark)

  • For security purposes

Migration and settlement of the Mijikenda
*       The Mijikenda by the 15th century had settled around Mt. Kilimanjaro and Taita Hills due to conflicts they migrated northwards to Shungwaya, which in Bantu means “To be driven away”. Somewhere between rivers Juba and Tana.
*       From Shungwaya, the Bantu were forced to move southwards by the  Oromo, who also stopped their northward migration around the 16th century AD. The Somali also joined the Oromo in forcing the Mijikenda out of Shungwaya, from where the Mijikenda moved in small groups, which explains why they  settled in different places and why today the Mijikenda exist and are identified by their small groups or clans.
*       The Mijikenda settled  in fortified villages, just inland from the coast. Each of the nine groups settled in their own separate ridges, which are commonly referred to as Kaya, a word that means  ‘towns’. The term Mijikenda itself expresses that the community consists of nine related groups.
*       Each Kaya was fortified with tree trunks. Even after settling in their present homeland, their main enemies were the Oromo and the Somali.
*       By the 19th century, the Mijikenda had interacted and established themselves as middlemen in the Long Distance trade between the Akamba and the Waswahili at the coast.

2013 18 (b) Explain five social effects of the migration and settlement of the Mijikenda in their present homeland. (10 marks)

  •        i.          They intermarried with other groups thereby strengthening relationships.
  •      ii.          There was cultural exchange due to their interaction with other people/ assimilation/absorption.
  •    iii.          There was an increase in population in the areas where they settled.
  •    iv.          There were inter-community conflicts/wars in the areas they settled.
  •      v.          It caused redistribution of people in the areas they settled leading to further migration/displacement.
  •    vi.          Some were converted to Islam due to their interaction with Arabs.
  •  vii.          It led to the establishment of Kaya/villages which were fortified in order to protect themselves against external attacks.
Any 5 x 2 = 10 marks
Pokomo
Ancestors of the Pokomo lived with those of the Mijikenda at Shungwaya, but the Pokomo moved southwards and settled along river Tana, where they interacted with Cushitic communities. Population pressure and Oromo attacks were the main reasons for Pokomo movement from Shungwaya.


QUIZ: Give the main reason why the Pokomo moved from Shungwaya. (1mark)

SPECIAL FEATURE-PHOTOSYNTHESIS

  PHOTOSYNTHESIS AND WHY IT IS IMPORTANT Photosynthesis and Why it is Necessary Photosynthesis is a critical process that sustains plants ...