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Under: NUMBER 2AI)
WHAT IS A LEAF ?
2AII)
STATE FIVE FUNCTIONS OF A LEAF ?
2BI)
STATE FIVE ADAPTIVE FEATURES OF COCKROACH TO ITS ENVIRONMENT ?
2020 ONDO STATE SS2 JOINT EXAM BIOLOGY QUESTIONS AND ANSWERS NOW AVAILABLE
[03/12, 06:55] CODEDBOSS: ONDO JOINT EXAM
BIOLOGY OBJ
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[03/12, 06:55] CODEDBOSS: Ondo Joint Exam
3ai) Cells are the basic unit of life. In the modern world, they are the smallest known world that performs all of life’s functions.
3aii)
Tabulate
Under Plant Cell
i. Cell shape is Square or rectangular in shape
ii. Cell Wall Present
iii. Mode of Nutrition is Primarily autotrophic
iv. Nucleus is Present and lies on one side of the cell
v. Vacuoles are Few large or a single, centrally positioned vacuole
vi. Cilia is Absent
Under Animal Cell
i. Cell shape is Irregular or round in shape
ii. Cell wall is Absent.
iii. Mode of Nutrition is Primarily autotrophicHeterotrophic
iv. Nucleus is Present and lies in the centre of the cell.
v. Vacuoles are Usually small and numerous.
vi. Cilia is Absent
3bi)
Advantages of Complex Organisms:
- They have the ability to perform complicated physiological functions. Eg. Faster movement enhances efficiency and therefore adaptability to their environment.
- Ability to capture smaller organisms for food.
- They have the ability to adapt to harsh conditions
- Ability to conserve energy due to complex organs that can save energy.
Disadvantages of Complex Organisms:
- All plants must be kept functioning together in co-ordinated manner.
- Complexity give rise to bigger size of higher organism which in turn lead to requirement of more space energy and environmental resources than single cell organisms.
- There is increase metabolic rate which consumes more food.
- It is costly to maintain a complex organism.
3bii)
Difference between Osmosis and diffusion.
Tabulate
Under Osmosis.
i. It is limited only to the liquid medium.
ii. Requires a semipermeable membrane.
iii Depends on the number of solute particles dissolved in the solvent.
iv. Requires water for the movement of particles.
Under Diffusion.
i. Occurs in liquid, gas and even solids.
ii.Do not require a semipermeable membrane.
iii.Depends on the presence of other particles.
iv. Do not require water for the movement of particles.
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4ai)
Photosynthesis is the process whereby greenplant manufacture their food (organic substances) making use of carbon di oxide and water in the presence of sunlight.
4aii)
i. Chlorophyll
ii. Sunlight
4aiii)
i. Repair and Maintain Cells
ii. Repair and maintenance of the body’s cells
iii. Growth and Development
4b)
i) Digestion can be defined as The process of breaking down of food into smaller particles that can be absorbed by the body.
ii) Dentition can be defined as the number, type, and arrangement of teeth of an animal
5ai)
- Plasma
The main job of the plasma is to transport blood cells throughout your body along with nutrients, waste products, antibodies, clotting proteins, chemical messengers such as hormones, and proteins that help maintain the body’s fluid balance. - Red Blood Cells
Red cells contain a special protein called hemoglobin, which helps carry oxygen from the lungs to the rest of the body and then returns carbon dioxide from the body to the lungs so it can be exhaled. - White Blood Cells
Tlymphocytes in white blood cells help regulate the function of other immune cells and directly attack various infected cells and tumors. B lymphocytes make antibodies, which are proteins that specifically target bacteria, viruses, and other foreign materials. - Platelets
Platelets help the blood clotting process (or coagulation) by gathering at the site of an injury, sticking to the lining of the injured blood vessel, and forming a platform on which blood coagulation can occur.
aii)
Blood clotting plays a pivotal role in the repair of blood vessels. The heart pumps blood throughout the body with the aid of the arteries, and in turn, blood goes back to the heart through the veins. When the blood vessels become injured, it will trigger the blood clotting process. This way, the body will repair the damage to stop hemorrhage or bleeding from happening.
5bi)
i. Thin walls.
ii. A moist inner surface.
iii. A huge combined surface area.
iv. A rich blood supply- each alveolus is sounded by capillaries.
v. Adaptation of the alveoli
5bii)
i. It Promotes tourism attraction
ii. Can enhance food security
iii. Important for the identification of new plant and animal species for research
iv. Protection of biodiversity and endangered species
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