Waec GCE 2025 First Series Biology Practical Question And Answer Now Available

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CBT WAEC GCE BIOLOGY PRACTICAL SOLUTIONS*

(1ai)

I – Spinous Process
II – Transverse Process
III – Rib
IV – Sternum
V – Costal Cartilage
VI – Vertebral Body

(1aii)
The bones are found in the thoracic region of the human body.

(1aiii)
State one function of each of the parts labelled I to VI:

(I): Provides attachment for muscles and ligaments of the spine.
(II): Serves as an attachment site for ribs and muscles.
(III): Protects internal organs such as the lungs and heart.
(IV): Provides support and attachment for ribs and helps protect the heart.
(V): Connects ribs to the sternum and provides flexibility to the ribcage.
(VI): Supports body weight and helps maintain posture.

First Series WAEC 2025: Subscribe For First Series 2025 Waec SSCE Examination Question And Answer

First Series WAEC 2025: Subscribe For First Series 2025 Waec SSCE Examination Question And Answer

First Series WAEC 2025: Subscribe For First Series 2025 Waec SSCE Examination Question And Answer

(3a)
(i)Spirogyra; (producer) (ii)Mosquito larvae; (primary consumer, herbivore)
(iii)Tadpoles; (secondary consumer, omnivore) (iv)Tilapia;(tertiary consumer, carnivore)

(3b)
https://i.imgur.com/yhNtQnE.jpeg

(3c)
(i)Mosquito larvae;
(i)Adaptation: They possess specialized mouthparts that function as a siphon to extract nutrients from the water surface.
(ii)Adaptation: Mosquito larvae are equipped with a streamlined body that aids in swimming and maneuvering within the water, enabling them to efficiently locate food sources.

(ii)Spirogyra:
(i)Adaptation: Spirogyra contains chloroplasts that facilitate photosynthesis, allowing them to convert sunlight into chemical energy, which is essential for their growth.
(ii)Adaptation: The filamentous structure of Spirogyra increases the surface area for light absorption, enhancing its ability to photosynthesize efficiently in aquatic environments.

(3di)
Mosquito Larvae;
(i)Suffocation: Oil forms a thick layer on the water’s surface, preventing mosquito larvae from breathing.
(ii)Reduced mobility: Oil can coat the larvae’s bodies, reducing their ability to move and feed.
(iii)Increased mortality: Prolonged exposure to oil can lead to the death of mosquito larvae.

(3dii)
Spirogyra;
(i)Reduced photosynthesis: Oil on the water’s surface can block sunlight, reducing photosynthesis in Spirogyra.
(ii)Inhibited growth: Oil can coat Spirogyra’s filaments, preventing nutrient uptake and inhibiting growth.
(iii)Increased risk of death: Prolonged exposure to oil can lead to the death of Spirogyra.

(3e)
(i)Reduced photosynthesis: Darkness prevents photosynthesis in autotrophic organisms like Spirogyra.
(ii)Changes in metabolic rates: Darkness can affect the metabolic rates of organisms, leading to changes in energy production and consumption.
(iii)Disruption of circadian rhythms: Prolonged darkness can disrupt the internal biological clocks of organisms, affecting their behavior and physiology.

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First Series WAEC 2025: Subscribe For First Series 2025 Waec SSCE Examination Question And Answer