SCIENCE QUIZ BEE GRADE 8 LEVEL

EASY ROUND

Multiple Choice

What are the main organs involved in the human digestive system?

• Brain, skin, muscles

  
  

• Spleen, bladder, gallbladder

  
  

• Mouth, esophagus, stomach, small intestine, large intestine, liver, pancreas, gallbladder

  
  

• Heart, lungs, kidneys

  
  

Multiple Select

Describe the process of digestion in the stomach.

• Digestion in the stomach involves the secretion of gastric juices, mixing food with these juices, and breaking it down into chyme.

  
  

• Digestion in the stomach is primarily a mechanical process without any juices.

  
  

• The stomach only stores food without any chemical breakdown.

  
  

• Food is absorbed directly into the bloodstream in the stomach.

  
  

Multiple Choice

What is the function of the large intestine in the digestive process?

• The large intestine absorbs nutrients.

  
  

• The large intestine absorbs water and forms feces.

  
  

• The large intestine produces bile.

  
  

• The large intestine digests proteins.

  
  

Multiple Choice

Explain the process of transpiration in plants.

• Transpiration is the process of photosynthesis in plants.

  
  

• Transpiration is the absorption of water by plant roots.

  
  

• Transpiration occurs only at night when plants are dormant.

  
  

• Transpiration is the process of water vapor loss from plants through stomata.

  
  

Multiple Choice

What are the main components of the plant transport system?

• Roots and leaves

  
  

• Stems and flowers

  
  

• Xylem and phloem

  
  

• Chloroplasts and mitochondria

  
  

Multiple Choice

How do xylem and phloem differ in their functions?

• Xylem is responsible for photosynthesis; phloem for respiration.

  
  

• Xylem and phloem both transport water and nutrients.

  
  

• Xylem transports sugars; phloem transports water and minerals.

  
  

• Xylem transports water and minerals; phloem transports sugars.

  
  

Multiple Choice

Describe how nutrients are transported in plants.

• Nutrients are transported in plants via the xylem and phloem.

  
  

• Nutrients are transported solely by the air.

  
  

• Nutrients are absorbed only through the roots.

  
  

• Nutrients move in plants through the leaves.

  
  

Multiple Choice

What role does the liver play in the digestive system?

• The liver detoxifies substances and produces bile.

  
  

• The liver produces insulin.

  
  

• The liver stores water and minerals.

  
  

• The liver is primarily responsible for nutrient absorption.

  
  

Multiple Choice

What is the primary function of the phloem in plants?

• Phloem is involved in the process of transpiration.

  
  

• Phloem transports sugars and nutrients produced by photosynthesis.

  
  

• Phloem stores energy for the plant.

  
  

• Phloem transports water and minerals from the roots.

  
  

Multiple Choice

The 8 levels of classification, broadest to most specific.

• Domain, Genus, Family, Order, Class, Phylum, Kingdom, Species

  
  

• Domain, Kingdom, Phylum, Class, Order, Family, Genus, Species

  
  

• Domain, Species, Kingdom, Genus, Phylum, Family, Class, Order

  
  

• Order, Kingdom, Species, Domain, Phylum, Family, Class, Genus

  
  

AVERAGE ROUND

Multiple Choice

What is the primary function of photosynthesis?

• The primary function of photosynthesis is to convert light energy into chemical energy in the form of glucose.

  
  

• To store energy in the form of fat.

  
  

• To release oxygen as a waste product.

  
  

• To absorb carbon dioxide from the atmosphere.

  
  

Multiple Choice

What is the role of chlorophyll in photosynthesis?

• Chlorophyll absorbs light energy for photosynthesis.

  
  

• Chlorophyll acts as a fertilizer for soil.

  
  

• Chlorophyll releases oxygen during photosynthesis.

  
  

• Chlorophyll provides nutrients to the plant.

  
  

Multiple Choice

Define taxonomy and its importance in biology.

• Taxonomy refers to the geographical distribution of species.

  
  

• Taxonomy is the study of animal behavior.

  
  

• Taxonomy is the classification of organisms; it is important for organizing biological diversity and understanding relationships among species.

  
  

• Taxonomy is the process of photosynthesis in plants.

  
  

Multiple Choice

What is the significance of Mendel's experiments in genetics?

• Mendel's experiments focused solely on animal behavior.

  
  

• Mendel's experiments laid the groundwork for modern genetics by revealing the basic laws of inheritance.

  
  

• Mendel discovered the structure of DNA through his experiments.

  
  

• Mendel's work was primarily about plant nutrition and growth.

  
  

Multiple Choice

What is a genotype and how does it differ from a phenotype?

• A genotype refers to the environment of an organism, while a phenotype is the genetic structure.

  
  

• A genotype is the physical appearance of an organism, while a phenotype is the genetic code.

  
  

• A genotype is the sum of all traits an organism can express, while a phenotype is the genetic potential.

  
  

• A genotype is the genetic makeup of an organism, while a phenotype is the observable traits resulting from that genotype.

  
  

Multiple Choice

How do dominant and recessive alleles affect inheritance?

• Dominant alleles are always expressed, while recessive alleles are only expressed in the absence of a dominant allele.

  
  

• Both dominant and recessive alleles are expressed equally in the phenotype.

  
  

• Recessive alleles are always expressed, while dominant alleles are only expressed in the absence of a recessive allele.

  
  

• Dominant alleles have no effect on the phenotype.

  
  

Multiple Choice

Who is known as the father of genetics?

• Gregor Mendel

  
  

• Charles Darwin

  
  

• Isaac Newton

  
  

• Louis Pasteur

  
  

Multiple Choice

In a Punnett square, what do the letters represent?

• The letters represent the colors of the flowers.

  
  

• The letters represent the alleles of the genes from each parent.

  
  

• The letters show the physical traits of the parents.

  
  

• The letters indicate the number of offspring.

  
  

Multiple Choice

What is the purpose of a Punnett square?

• To determine the physical appearance of an organism

  
  

• To analyze the behavior of different species

  
  

• The purpose of a Punnett square is to predict the genetic outcomes of a cross between two organisms.

  
  

• To calculate the age of an organism

  
  

Multiple Choice

What is a recessive trait?

• A recessive trait can be seen in every generation regardless of allele combinations.

  
  

• A recessive trait is expressed with only one allele present.

  
  

• A recessive trait is always dominant over other traits.

  
  

• A recessive trait is a genetic trait that is only expressed when two recessive alleles are present.

  
  

DIFFICULT ROUND

Multiple Choice

Draw a Punnett square for a cross between two heterozygous pea plants (Tt).

• TT, TT, tt, tt

  
  

• TT, Tt, tt, tt

  
  

• Tt, Tt, Tt, Tt

  
  

• TT, Tt, Tt, tt

  
  

Multiple Choice

In a dihybrid cross, how many traits are being studied?

• 3

• 1

• 4

• 2

Multiple Choice

In a monohybrid cross between two heterozygous parents (Aa x Aa), what is the expected phenotypic ratio?

• 1:2

• 2:1

• 4:0

• 
  
  3:1

Multiple Choice

What percentage of offspring will be homozygous recessive in a cross of Aa x Aa?

• 75%

• 50%

• 10%

• 
  25%

Fill in the Blank

A male rabbit with the genotype GGbb is crossed with a female rabbit with the genotype ggBb . How many out of 16 have gray fur and black eyes?

Fill in the Blank

A tall green pea plant (TTGG) is crossed with a short white pea plant (ttgg).

TT or Tt= tall tt=short GG or Gg=green gg=white

Tall/Green : ______

Fill in the Blank

A tall green pea plant (TTGg) is crossed with a tall green pea plant (TTGg).

TT or Tt= Tall tt=short GG or Gg=Green gg=white

Tall/Green=?

Fill in the Blank

A tall green pea plant (TTGg) is crossed with a tall green pea plant (TTGg).

TT or Tt= Tall tt=short GG or Gg=Green gg=white

Tall/White=?

Fill in the Blank

A tall green pea plant (TTGg) is crossed with a tall green pea plant (TTGg).

TT or Tt= Tall tt=short GG or Gg=Green gg=white

short/green=?

Fill in the Blank

In a dihybrid cross between RrYy × RrYy, how many of the 16 offspring are expected to have both dominant traits (round and yellow seeds)?

(Use the example: R = round, r = wrinkled, Y = yellow, y = green seeds in pea plants)