Len Academy biology mock questions for waec

len Alfred Ajibola - 28th February, 2024 @ 11:28 AM

Topics in Biology

Cellular respiration in biology Len Academy biology mock questions for waec Len Academy biology midterm questions for SS1, 2nd Term Characteristics of saltwater habitat Aquatic habitat explained with its types Types of habitat: Terrestrial habitat explained with examples What is habitat? Difference between plant cell and animal cell Nucleus explained with its structures Nucleus explained with its types and functions Organelles of the cell explained with their characteristics Eukaryotic cell explained with its characteristics Prokaryotic cell explained with its structure Characteristics of prokaryotic cell Concept of cell Cell theory in biology Importance and limitations of ecological pyramid Protists explained with their characteristics Contents of the scrotum: Epididymis, vas deferens, spermatic cord and cremaster muscle Tropical savanna explained with its characteristics

Academic Questions in Biology

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Male Reproductive System - Len Academy

From the above diagram, which of the organ below isn't a requirement for the male reproductive system?

  • A. Bladder

  • B. Ureter

  • C. Glans Penis

  • D. Testis

  • E. Bulbourethral Gland

  • F. Epididymis

A walnut shaped male accessory sex organ located between the bladder and penis is the _____.

  • A. Ductus Ejaculatorii

  • B. Bulbourethral Gland

  • C. Prostate Gland

  • D. Ductus Deferens

  • E. Seminal Vesicles

  • F. Epididymis

In a food chain, the primary consumers are classified under trophic level  _____.

  • A. Zero

  • B. One

  • C. Two

  • D. Three

  • E. Four

  • F. Five

Cold blooded animals are referred to as _____.

  • A. Homeotherms

  • B. Endotherms

  • C. Poilokitherms

  • D. Ectotherms

  • E. Thermotherms

  • F. None of the above

All reptiles are vertebrates.

  • A. True

  • B. False

_____ cells are responsible for the formation of osteoblasts.

  • A. Osteocytes
  • B. Chondrocytes
  • C. Chondroblasts
  • D. Osteoclasts
  • E. Osteoprogenitor cells
  • F. Osteoblastic

_____ is a bone that constitute the axial skeleton.

  • A. Clavicle
  • B. Scapula
  • C. Patella
  • D. Radius
  • E. Sternum
  • F. Femur

Which of the following is false concerning cartilages and bones?

  • A. Cartilage does not have a direct blood supply while bones have direct blood supply
  • B. The process of ossification replaces a cartilage to bone
  • C. The protein that makes up cartilage is called chondrin while that that makes up bone is called ossein
  • D. Cartilage grows from both ends while bones grow from one of its epiphysis
  • E. They both have living cells within them
  • F. Haversian system is absent in cartilage but present in bones

1. Which of the following organisms possess both plant and animal characteristics?

  • A. Amoeba

  • B. Paramecium

  • C. Euglena

  • D. Mucor


2. Which of the following group embraces the rest?

  • A. Class

  • B. Kingdom

  • C. Phylum

  • D. Specie


3. Hydra is considered to be at the tissue level of organization of life because it _____.

  • A. Has numerous cells that perform different functions

  • B. Has developed organs and systems

  • C. Has a poorly developed nervous system

  • D. Reproduces by budding


4. An example of an organism that exists as a colony is _____.

  • A. Spirogyra

  • B. Paramecium

  • C. Euglena

  • D. Volvox


5. Which of the following can destroy other cell organelles?

  • A. Centriole

  • B. Ribosome

  • C. Lysosome

  • D. Mitochondrion


6. In which of the plant tissues are guard cells located?

  • A. Epidermis

  • B. Mesophyll

  • C. Vascular bundles

  • D. Meristems


7. Turgidity in the cell of plant does not easily lead to bursting of the cell because the _____.

  • A. Cell membrane can resist the turgidity

  • B. Large vacuole contained in the cell can continuously take in water

  • C. Cellulose cell wall can resist the turgidity

  • D. Cytoplasm is jelly-like


8. Which of the following can be used to detect the loss of water vapour from the leaves of plants?

  • A. Hydrated copper sulphate

  • B. Blue litmus paper

  • C. Red litmus paper

  • D. Blue cobalt chloride paper


9. Even though some flowering plants contain accessory pigments which give them colours, they still contain the pigment _____.

  • A. Melanin

  • B. Chlorophyll

  • C. Xanthrophyll

  • D. Carotene


10. Which of the following organisms is a chemoautotroph?

  • A. Virus

  • B. Bacteria

  • C. Paramecium

  • D. Euglena


11. Which of the following features of the tadpole indicates that the animal is herbivore? Possessions of _____.

  • A. Operculum

  • B. Muscular tail

  • C. Long coiled intestine

  • D. Internal gills


12. In a biuret test, some protein was mixed with sodium hydroxide solution. Which of the following chemicals should be added to the mixture for a positive result?

  • A. Mercurios nitrate

  • B. Copper sulphate

  • C. Sodium carbonate

  • D. Silver nitrate


13. Excessive carbohydrates can be stored in muscles in the form of _____.

  • A. Cellulose

  • B. Glycogen

  • C. Chitin

  • D. Lipids


14. Pepsin is secreted as an inactive precursor called pepsinogen because?

  • A. Pepsin as an enzyme is quickly destroyed by the alkaline food from the mouth

  • B. All digestive enzymes pass through a precursor stage

  • C. Pepsin is a proteolytic enzyme and might attack the stomach tissue

  • D. Pepsin is not required in large quantities


15. The enzyme that acts on milk in the stomach is _____.

  • A. Invertase

  • B. Trypsin

  • C. Diastase

  • D. Renin


16. In cellular respiration, energy is made available to organisms by _____.

  • A. Removal of phosphate group from ADP

  • B. Breaking off a phosphate group from ATP

  • C. Adding a phosphate group to glucose

  • D. Breaking off a hydrogen ion from NADPH


17. When a mammal respires anaerobically for long time, _____.

  • A. Pyruvic acid is converted into acetyl COA

  • B. More energy is released from fats in the body

  • C. Lactic acid accumulates in the muscles

  • D. The Kreb's cycle is fully completed


18. A substance present in the glomerular filtrate in the mammalian kidney is _____.

  • A. Glucose

  • B. Fibrinogen

  • C. Albumen

  • D. Blood platelets


19. The cup-shaped part of the Bowman's capsule contains the _____.

  • A. Nephridium

  • B. Glomerulus

  • C. Loop of Henle

  • D. Nephron


20. Growth includes the following processes except _____.

  • A. Differentiation

  • B. Enlargement

  • C. Mitosis

  • D. Meiosis


21. Two organelles directly involved in mitotic division are _____.

  • A. Nucleus and Mitochondrion

  • B. Ribosome and Nucleus

  • C. Centriole and Golgi apparatus

  • D. Nucleus and Centriole


22. The first stable product of photosynthesis is _____.

  • A. Starch

  • B. Fructose

  • C. Glucose

  • D. Sucrose


23. The stem of young herbaceous plants are kept upright mainly by _____.

  • A. Osmotic pressure

  • B. Turgor pressure

  • C. Transpiration pull

  • D. Suction pressure


24.  The axial skeleton is made up of the _____.

  • A. Skull, vertebral column, ribcage and sternum

  • B. Limbs and limb girdles

  • C. Lumbar and thoracic vertebrae

  • D. Vertebral column and lumbar vertebrae


25. Plants and animals of an ecosystem make up a _____.

  • A. Habitat

  • B. Succession

  • C. Community

  • D. Population


26. A pyramid of numbers is constructed by _____.

  • A. Comparing living and nonliving things

  • B. Measuring productivity

  • C. Conducting census

  • D. Labelling the living organisms


27. Breathing roots are characteristic structures of plants growing in _____.

  • A. Mangrove swamp

  • B. Desert

  • C. Shrub biome

  • D. Savanna


28. The capillarity of a soil refers to _____.

  • A. The particle size of soil

  • B. How water easily passes through the soil

  • C. How well water rises up the soil

  • D. Proportion of water a soil holds


29. Which of the following can cause desert encroachment?

  • A. Afforestation

  • B. Irrigation

  • C. Planting of trees

  • D. Overgrazing


30. Viruses are causes of the following diseases except _____.

  • A. Measles

  • B. Small pox

  • C. Poliomyelitis

  • D. Tuberculosis


31. Which of the following infection is unlikely to respond to antibiotic treatment.

  • A. Typhoid fever

  • B. Measles

  • C. Tetanus

  • D. Ringworm


32. Which of the following statements is not correct about food chains?

  • A. Animals in the chain are consumers

  • B. Living things are dependent on one another

  • C. Shorter food chain indicate more effective utilization of energy than longer ones

  • D. There is no energy loss in a food chain


33. Which of the following factors does not affect the distribution of organisms in an aquatic habitat?

  • A. Turbidity

  • B. Depth of water

  • C. Humidity

  • D. Temperature


34. During sexual reproduction in paramecium, how many times does the zygote divide to produce eight nuclei?

  • A. 1

  • B. 2

  • C. 3

  • D. 4


35. In mammals, fertilization usually occurs in the _____.

  • A. Cervix

  • B. Ovary

  • C. Oviduct

  • D. Uterus


36. Which of the following organisms exhibit extracellular digestion?

  • A. Moulds

  • B. Green plants

  • C. Algae

  • D. Bryophytes


37. During prolonged exercise, glucose in the muscle is converted to _____.

  • A. Pyruvic acid

  • B. Lactic acid

  • C. CoEnzyme

  • D. Ethanol


38. The reason why the flow of blood through the capillaries is very slow is _____.

  • A. Because the walls of the capillaries are very thin

  • B. To avoid high blood pressure

  • C. To ensure that the individual does not get dizzy

  • D. To allow adequate time for exchange of materials


39. Which of the following blood components has the greatest affinity for oxygen and carbon dioxide?

  • A. Blood plasma

  • B. Leucocytes

  • C. Thrombocytes

  • D. Erythrocytes


40. The exchange of gases between the environment and the respiratory organs of vertebrates is referred to as _____.

  • A. Inhalation

  • B. Respiration

  • C. Expiration

  • D. Breathing


41. The respiratory organs found in cockroach is the _____.

  • A. Air sac

  • B. Tracheae

  • C. Lung book

  • D. Lung


42. Which of the following processes removes carbon dioxide from the atmosphere?

  • A. Respiration

  • B. Photosynthesis

  • C. Transpiration

  • D. Excretion


43. Which of the following insects is not a social insect?

  • A. Termite

  • B. Housefly

  • C. Honeybee

  • D. Ant


44. A xerophytes conserves water via the possession of _____.

  • A. Thick cuticle

  • B. Broad leaf surface

  • C. Sunken stomata

  • D. Waxy cuticle


45. The legs of an accident victim with a fractured vertebral column and injured spinal cord could not be raised because _____.

  • A. Impulse from receptors in the legs cannot travel to the brain

  • B. Impulses from the brain cannot travel to the legs

  • C. Chemical substances will be released at synapses in the central nervous system

  • D. Reflex actions cannot take place in the legs


46. Each neurone consists of the following structures except _____.

  • A. Cell body

  • B. Axon

  • C. Dendrite

  • D. White matter


47. To focus on a distant object, the ciliary muscle of the eye _____.

  • A. Contracts and the eye lens gets thicker

  • B. Relaxes and the eye lens gets thinner

  • C. Contracts and the eye lens gets thinner

  • D. Relaxes and the eye lens gets thicker


48. Which of the following conditions will cause a decrease in body temperature?

  • A. Increased metabolism

  • B. Shivering

  • C. Vasoconstriction of capillaries of the skin

  • D. Relaxation of the erector muscles


49. In both dicotyledonous ad monocotyledonous plants, the root hair originate from the _____.

  • A. Piliferous layer

  • B. Epidermal layer

  • C. Endodermal layer

  • D. Cortical layer


50. What would be the phenotypic ratio of the offspring of a cross between a heterozygous dominant parent and a double recessive parent?

  • A. 1:2:1

  • B. 2:1:1

  • C. 3:1

  • D. 1:1:2

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Amazing facts in Biology

Russia is home to the largest area of forest in our world with a land mass of 815 million hectares

Giant Squid - Len Academy

Giant squid lives deep in the ocean and they have the largest eyes in the world

The movements of the fingers are controlled by muscles of the palms and forehands

Platypus - Len Academy

Platypus (sometimes referred to as the duck-billed platypus) is an egg-laying, semiaquatic mammal found in eastern Australia. It has no stomach and as such, its food goes from the mouth through the esophagus and directly to their intestines.

Pufferfish - Len Academy

Pufferfish contain a toxin called tetrodotoxin. This makes them foul tasting and poisonous to predators. Tetrodotoxin is about 1,200 times more poisonous than cyanide, and there is enough toxin in one pufferfish to kill 30 adult humans. Unfortunately, there isn't any known antidote to this poison.

Interestingly, a delicacy in Japan (called fugu) is made from pufferfish. This meal is very expensive, and must be prepared by trained and licensed chefs. An improper preparation of fugu may lead to the customer's death. Sadly, such deaths are recorded annually

Wombat - Len Academy ​​​​​​

Wombats are the only animal with a cube-shaped poo. They can stack up these cube-shaped poo, marking their territory with it

Robert Waldow - Len Academy

Robert Wadlow (1918–1940) remains the tallest man ever recorded in the Guinness World Records. He was an American who stood at 8 feet, 11 inches.

An abnormally enlarged pituitary gland had resulted into Robert Wadlow's giant size.

Cockroach is the fastest land animal on six legs

Laughing ape - Len Academy

Like humans, all apes laugh when tickled

Ostrich eye and brain - Len Academy

An ostrich's eye is bigger than its brain

Notable points in Biology

Layers of an Artery - Len Academy

An artery is composed of three layers:

  • The outermost layer is termed tunica adventitia (or tunica external). It consist mainly of collagen fibres and connective tissues that anchors the arteries to other nearby tissues.

  • The middle layer is named tunica media. It is made up of smooth muscles and elastic fibres that supports the artery in conveying blood at high pressures.

  • The inner layer is called tunica intima (or tunica internal). It is lined by a smooth tissue called endothelium, and is made up of a fine network of connective tissues.

Please read on the layers of an artery here

All living organisms possess various features in order to survive in their environment. This is the concept of adaptation. As an instance, a fish is able to live in water because it has gills and fins.

Also, a camel is able to survive in the desert because it has large feet to aid walking on sand without sinking. It also has long eyelashes to help protect it from the blowing sand and wind.

Plants are also able to live in different habitats because they have the required adaptive features towards that habitat. For instance:

  • Plants that live in/on water are termed hydrophytes.

  • Plants that live on land with moderate amount of water are termed mesophytes.

  • Plants that live on deserts or arid lands are termed xerophytes.

The point is:

All organisms have various features on them that enables them adapt in their habitat

For a thing to be considered living, it must possess all the basic characteristics of life. These include:

  1. Movement

  2. Respiration

  3. Nutrition

  4. Irritability or Sensitivity

  5. Growth

  6. Excretion

  7. Reproduction

  8. Death

  9. Adaptation

  10. Competition

Please read the explanations on all the basic characteristics of life here

During strenuous exercises like sprinting or running, your body may actually work in the shortage of oxygen. During this time, your body owes oxygen (called oxygen debt) and it must be replenished or repayed after the exercise is stopped. This is why you breathe excess of oxygen after you stopped the exercise.

This is the concept of anaerobic respiration

Food Chain - Len Academy

A food chain is a diagram that shows the relationship between plants and animals within a habitat on the basis of how they rely on each other for food.

Note: Habitat is a place where an organism live. It is of three types:

  • Terrestrial (Land)
  • Aquatic (Water)
  • Arboreal (Treetops)

You can read on food chain here