This biology question covers important biological concepts and processes. The step-by-step explanation below helps you understand the underlying mechanisms and reasoning.

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Step 1: Jibu la Swali la 25 *a) Sifa mbili za pili za kike zinazoendelea wakati wa kubalehe ni: • Kukua kwa matiti. • Kupanuka kwa nyonga. *b) Sifa mbili za pili za kiume zinazoendelea wakati wa kubalehe ni: • Sauti kuwa nzito. • Kukua kwa ndevu na nywele nyingine za usoni.
Step 2: Jibu la Swali la 26 *a) Kazi kuu ya mfumo wa upumuaji wa binadamu ni kubadilishana gesi, yaani, kuchukua oksijeni na kutoa kaboni dioksidi. *b) Kiungo kikuu cha mfumo wa upumuaji wa binadamu ni mapafu. *c) Njia mbili za kudumisha mfumo wa upumuaji wenye afya ni: • Kuepuka kuvuta sigara na moshi wa aina yoyote. • Kufanya mazoezi mara kwa mara.
Step 3: Jibu la Swali la 27 *a) Ili kukokotoa shinikizo (pressure) anayotoa Karen kwenye hewa ndani ya pampu, tunatumia formula . * Nguvu () = * Eneo () = Shinikizo analotoa Karen ni .
*b) Ili kukokotoa nguvu (force) inayotolewa na tairi barabarani, tunatumia formula . * Shinikizo () = * Eneo () = Nguvu inayotolewa na tairi barabarani ni .
Step 4: Jibu la Swali la 28 *a) Alama za kemikali kwa: • Kaboni: C • Sodiamu: Na *b) Tofauti kati ya elementi na kampaundi: • Elementi ni dutu safi inayoundwa na aina moja tu ya atomi na haiwezi kuvunjwa kuwa dutu rahisi zaidi kwa njia za kemikali. Mfano: Oksijeni (O). • Kampaundi ni dutu inayoundwa wakati elementi mbili au zaidi tofauti zimeunganishwa kemikali pamoja kwa uwiano maalum. Mfano: Maji (H₂O), ambayo huundwa na hidrojeni na oksijeni.
Step 5: Jibu la Swali la 29 Majina ya seli zifuatazo ni: *a) Seli ya neva (Neuron) *b) Seli ya shahawa (Sperm cell) *c) Seli nyekundu za damu (Red blood cells) *d) Seli za ulinzi (Guard cells) (zinazopatikana kwenye stomata ya mimea)
Step 6: Jibu la Swali la 30 *a) Sehemu mbili kuu za darubini zinazosaidia kukuza sampuli ni: • Lenzi ya macho (Eyepiece/Ocular lens) • Lenzi lengwa (Objective lens)
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This biology question covers important biological concepts and processes. The step-by-step explanation below helps you understand the underlying mechanisms and reasoning.