KCSE KNEC LEAKAGE 2025

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Updated: May 15, 2026 at 1:17 AM

KCSE KNEC LEAKAGE 2025

2025 KCSE CANDIDATES JOIN AND CONTINUE SHARING OUR LINK. KCSE 2025 LEAKAGE WILL BE AVAILABLE https://t.me/KCSELEAKAGE_1

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KCSE KNEC LEAKAGE 2025

May 23, 2026, 06:54 PM

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History paper 2 answers. For more join👇
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KCSE KNEC LEAKAGE 2025

May 23, 2026, 06:54 PM

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KCSE KNEC LEAKAGE 2025

May 23, 2026, 06:54 PM

History paper 2 with answers KSH. 2000
History without answers KSH. 1500
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KCSE KNEC LEAKAGE 2025

May 23, 2026, 06:54 PM

Done with today's paper distribution. If you haven't received history paper inbox me with 1000kes

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KCSE KNEC LEAKAGE 2025

May 23, 2026, 06:54 PM

HISTORY PP2 ALREADY POSTED HERE👇

https://t.me/+8G7mWFl8wmY4N2I0

https://t.me/+8G7mWFl8wmY4N2I0

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KCSE KNEC LEAKAGE 2025

May 23, 2026, 06:54 PM

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Congratulations to everyone who purchased the papers and received them on time.
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KCSE KNEC LEAKAGE 2025

May 23, 2026, 06:54 PM

QUESTION 7

(a) Role of the stomach in digestion (5 marks)

The stomach secretes gastric juice containing hydrochloric acid (HCl), pepsin, and rennin.

HCl provides an acidic medium (pH ~2) suitable for enzyme activity and kills harmful microorganisms.

Pepsin converts proteins into peptides (proteoses and peptones).

Rennin (in infants) coagulates milk protein (caseinogen) into casein for easier digestion.

The stomach muscles churn and mix food with gastric juice to form chyme, which is released slowly into the duodenum through the pyloric sphincter.

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(b) Mechanisms that lead to the opening of stomata during the day (15 marks)

During the day, light stimulates the guard cells (especially blue light receptors).

Guard cells actively transport potassium ions (K⁺) from surrounding epidermal cells into their vacuoles using ATP.

The chloroplasts in guard cells photosynthesize, producing ATP used for active transport.

The increase in K⁺ ions lowers the water potential of guard cells.

Water moves by osmosis from neighboring epidermal cells into the guard cells.

Guard cells become turgid, while adjacent epidermal cells become flaccid.

The inner walls of guard cells are thicker and less flexible than the outer walls.

As turgor pressure increases, the outer walls bulge outward, and the inner walls curve, pulling the stomatal pore open.

The stomatal aperture enlarges, allowing gaseous exchange and transpiration.

At midday (high temperatures), excessive water loss can cause loss of turgor, closing the stomata to reduce transpiration.

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QUESTION 8

(a) Forces involved in the uptake of water in terrestrial plants (5 marks)

Root pressure – upward push due to osmotic uptake of water by root cells.

Capillarity – water rises through narrow xylem vessels due to adhesion and cohesion.

Cohesion – water molecules stick together, forming an unbroken water column.

Adhesion – water molecules adhere to xylem vessel walls.

Transpiration pull – main force; loss of water from leaves creates a suction force pulling water upward.

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(b) Withdrawal of hand from a thorn (reflex action) (15 marks)

The thorn pricks the skin, stimulating pain receptors (nociceptors).

Receptors generate nerve impulses.

Impulses are transmitted via sensory neurones to the spinal cord (dorsal root).

In the spinal cord, impulses are transmitted through an intermediate (relay) neurone.

The relay neurone connects to a motor neurone.

The motor neurone carries impulses through the ventral root to effector muscles in the arm.

The effector muscles (flexor muscles) contract.

The extensor muscles relax, causing the hand to withdraw quickly from the thorn.

This rapid, involuntary response is a reflex action, helping protect the body from injury.

Meanwhile, impulses are also sent to the brain for awareness of pain after the reflex occurs.

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Would you like me to format these in KNEC marking scheme style (point-by-point mark allocation) or in full paragraph essay style (for notes or revision use)?

KCSE KNEC LEAKAGE 2025

May 23, 2026, 06:54 PM

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BIOLOGY PAPER 2 ANSWERS
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KCSE KNEC LEAKAGE 2025

May 23, 2026, 06:54 PM

FOR MY SIMPLIFIED BIO ANSWERS JOIN HERE. DON'T USE AI GENERATED ANSWERS IN BIOLOGY YOU WILL FAIL⚠️
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KCSE KNEC LEAKAGE 2025

May 23, 2026, 06:54 PM

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These are the same papers which were sent to the VIP GROUP 📌
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