Biology: Eame one

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Biology Exam: Part 1

Instruction: Select the correct answer from the given choice.

1. If your body cannot make enough red blood cells, which one of the following mineral rich foods can correct this problem?

A. Iodine-rich food
B. Sodium-rich food
C. Calcium-rich food
D. Iron-rich food

2. A biology teacher provided common names of three organisms; human being, dog and housefly. In which way should the scientific names be written?

A. Homo sapiens, Canis familiaris and musca domestica
B. Homo Sapiens, Canis Familiaris and Musca Domestica
C. Homo sapiens, Canis Familiaris and Musca Domestica
D. Homo Sapiens, Canis familiaris and Musca domestica

3. Identify the typical examples of the division Gymnospermae and Angiospermae, respectively?

A. Grasses and legumes
B. Grasses and palms
C. Legumes and palms
D. Mosses and ferns

4. A student collected plants with long thin leaves, parallel venation and scattered vascular bundles. What type of plants are these?

A. Dicotyledons
B. Monocotyledons
C. Ferns
D. Mosses

5.Consider the following diagram of pyramid of biomass.

Which one of the following statement is correct about a pyramid of biomass?

A. Much of the biomass from stage II is used by stage III to release energy for living.
B. At each stage... biomass... supports a large amount of organism in the stage above.
C. When organisms in stage II eat the producers, most of the producer's materials are turned into new secondary consumers.
D. The whole organisms at first trophic level is eaten by the organisms above.

6. Which statement is correct about the nervous system?

A. Produces secretions into bloodstream via ducts
B. Receives and processes sensory information
C. Transports blood through the heart
D. Supplies oxygen and removes carbon dioxide

7. What is the role of voltage-gated ion channels in nerve impulse transmission?

A. Allow potassium ions inside during depolarization
B. Produce energy
C. Block ion movement
D. Respond to membrane potential changes

8. Which ion facilitates the release of neurotransmitters into the synaptic cleft?

A. Potassium ions
B. Sodium ions
C. Magnesium ions
D. Calcium ions

9. Find the correct pathway of a reflex arc.

A. Sensory neuron → spinal cord → motor neuron → effector
B. Interneuron → spinal cord → motor neuron → effector
C. Sensory neuron → motor neuron → spinal cord → effector
D. Interneuron → receptor → motor neuron → effector

10. This items is based on the following diagram of anatomy of human eye.

Which part of the human eye controls the diameter of the pupil according to the light source?

A. Pupil
B. Iris
C. Cornea
D. Lens

11. Which of the following is correct about the movement of water in plants?

A. Moves across tissues by osmosis
B. Uses energy until reaching xylem
C. Moves through phloem by diffusion
D. Moves against water potential gradient

12. What happens when indole-acetic acid is removed from the main shoot part of the plant?

A. Main shoot elongates
B. Side shoots slow down
C. It stimulates dropping Leaves
D. Plant becomes bushy

13. Which list contains characteristics of animals?

A. Heterotrophic, excrete, motility and grow
B. Respire, multicellular, autotrophic and reproduce
C. Unicellular, heterotrophic and motility
D. Respire, excrete, autotrophic and reproduce

14. Which animal has a closed circulatory system and a centralized nervous system?

A. Squid
B. Snake
C. Earthworm
D. Snail

15. What does poikilothermic mean?

A. Constant body temperature
B. Produces heat internally
C. High metabolic rate always
D. Body temperature changes with environment

16. What happens if rodents decrease in the food chain?

Leaves → Grasshoppers → Rodents → Leopards

A. No change in leopards
B. Increase in grasshoppers
C. Fewer grasshoppers
D. Increase in leopards

17. Which is NOT involved in the carbon cycle?

A. Photosynthesis
B. Decomposition
C. Cellular respiration
D. Evaporation

18. Mitosis is a division of

A. Somatic cells producing identical cells
B. Sex cells producing different cells
C. Sex cells with doubled chromosomes
D. Somatic cells with half chromosomes

19. What is common to mitosis and meiosis?

A. Same chromosome number as parent
B. Gamete formation
C. Identical daughter cells
D. DNA replication

20. Which tissues are responsible for waterproofing, photosynthesis and gas exchange?

A. Waxy cuticle, spongy mesophyll, palisade mesophyll
B. Waxy cuticle, palisade mesophyll, spongy mesophyll
C. Guard cells, palisade mesophyll, spongy mesophyll
D. Guard cells, palisade mesophyll, epidermis

21. Which enzyme class and function is correctly matched?

A. Lyases – cleave bonds without hydrolysis
B. Ligases – hydrolysis
C. Transferases – electron transfer
D. Oxidoreductases – group transfer

22. Which condition best optimizes enzyme activity?

A. Temperature 20–45°C with minimal denaturation
B. pH below 4
C. pH above 9
D. Temperature below 20°C

23. Which does NOT define a chromosome?

A. Made of DNA and protein
B. Exists in pairs in diploid organisms
C. Contains many genes
D. Functional unit of inheritance

24. What is a correct difference between DNA and RNA?

A. RNA stores genetic material
B. DNA is more stable than RNA
C. RNA produces DNA
D. Same bases but different sugars

25. Which event does NOT occur during telophase I?

A. Chromosomes come together
B. Nuclear envelope reforms
C. Crossing over occurs
D. Spindle fibers disappear

Biology Exam: Part 1

Exam Results