science for grade 9

1. SCIENCE 9
NAME:_______________________________________ Grade and Section:____________________
Summative Test FOR WEEK 4 TOTAL POINTS 26
Part A: IDENTIFICATION (5 points)
Direction: Identify the word/phrase being described. Write your answers on the space provided
before each number.
_____________1. This results in the inability to have normal blood clotting.
_____________2. This refers to a person’s inability to distinguish a certain a color from the other.
_____________3. These are traits controlled by sex-linked genes.
_____________4. This refers to a person who has one recessive allele for a trait and one dominant
allele.
_____________5. These are the genes linked to the X and Y chromosomes.
Part B: FACT or BLUFF (5 points)
Direction Write the word FACT on the blank if the sentence is correct and BLUFF if it is incorrect.
Write your answers on the space provided before each number.
______6. The ability to discriminate between the colors red and green is controlled by the gene
located in the Y chromosome.
______7.Most of the sex-linked disorders are associated with Y chromosome.
______8. Colorblindness is more common in males than in females.
______9. Baldness is a sex-linked trait.
______10. Males have only one X chromosome. Thus, if they inherit the affected X, they will have
the disorder.
Part C. (10 points)
Direction: Put a check mark ((√) if the statement is correct and a cross mark (X) if the statement is
incorrect. Write your answers on the space provided before each number.
_____1. Sex-limited traits are manifested only in one sex.
_____2. Sex-limited traits are generally autosomal.
_____3. Sex-limited traits are found on the X and Y chromosomes.
_____4. Sex-limited genes are expressed in the phenotype of an individual.
_____5. Baldness is a sex-limited trait.
_____6. Autosomal genes are found in both sexes.
_____7. Roosters develop a large comb, while hens of the same breed do not.
_____8. In cows, milk production is found in bulls and cows, but it is not manifested by bulls.
_____9. . In humans, a son may inherit the growth of facial hair from his mother although the trait
may not be expressed on her appearance.
_____10. Bright plumage of certain male birds does not appear in females of the same species
Part D. (6 POINTS)
Direction: Complete the table below. (Refer to the given statement about baldness.) Write your
answers on the space provided.

2. One classic example of a sex-influenced traits is baldness B. It is dominant in males but recessive in
females. Both males and females with the genotype BB are likely to be bald. Men having a genotype
Bb usually go bald but females with this condition do not.
The allele for normal hair, b, is recessive in males but dominant in females. Neither males nor
females with bb genotypes are bald.
Expression of Pattern Baldness in Humans
Genotype in Symbols Phenotype (Males) Phenotype (Females)
1. BB 1.
_____________________
2.
_____________________
2. Bb 3.
_____________________
4.
_____________________
3. bb 5.
_____________________
6.
_____________________
CLUE:
PHENOTYPE: - BALD -NON BALD

3. NAME:_______________________________________ Grade and Section:____________________
Summative Test FOR WEEK 5 TOTAL POINTS 25
Part A. FILL IN THE BLANKS (10 points)
Direction: Read each statement carefully and fill in the blanks with the correct answer. Choose your
answers from the pool of words inside the box:
Our 1____________ is very important to the well-being of our planet. Most cultures have recognized
the importance of conserving 2___________ . It increases 3_____________ productivity where each
species has a specific role to play in an 4______________ and supports a larger number of plant
5______________ therefore producing a greater variety of crops. It protects 6______________
resources supplying clean and potable water supply for us. It promotes soil formation and protection
needed for bountiful 7_____________ .It aids in breaking down 8_____________ for us to breathe
fresh air. It contributes to climate stability and lessen impact of 9______________ . It provides more
medicinal resources and pharmaceutical drugs from plants and animals used for 10______________
promotion. Lastly, it offers top sights for tourist attractions because of its preserved natural
resources.
Part B. MULTIPLE CHOICE (15 points)
Direction: Choose the letter of the correct answer. Write the letter on the space provided before
each number.
_____1. Which of the following is more prone to extinction if its population continue to decrease?
A. any species of animal
B. any species of plant
C. any species of animal, plant
D. None of the above
_____2. Which of the following is/are the greatest threat/s among endangered species?
A. habitat destruction
B. illegal hunting
C. environmental protection
D. Both A and B
_____3. How can you help protect endangered animals from extinction?
A. reduce, recycle, and reuse
B. protect natural habitats
C. landscape with native plants
D. all of the above
_____4. What do you call the place where a species lives and reproduces its own kind?
A. Habitat
B. Ecosystem
C. Wildlife
D. Extinction
_____5. What is/are the most important factor/s that leads to extinction?
S freshwater environment
pollutants species biodiversity
global warming
natural resources ecosystem health food production

4. A. Hunting
B. Overharvesting
C. Pollution
D. all of the above
_____6. Pollutants dumped into the rivers and streams eventually find their way to
A. the ocean
B. the atmosphere
C. groundwater supplies
_____7. The average temperature of the earth’s atmosphere may rise as a result of
A. the greenhouse effect
B. water pollution
C. garbage dumping
_____8. Can occur due to run off pollutants such as pesticides and fertilizers.
A. Increased gas emissions
B. Increased crop production
C. Increased water pollution
_____9. Acid rain forms
A. when ozone layer is depleted
B. when sulfuric acid mix with moisture and oxygen
C. when there is temperature inversion
_____10. Humans are using ___________ natural resources than they did 100 years ago.
A. fewer
B. better
C. more
_____11. Which activities most directly control erosion?
A. reforestation and cover cropping
B. established fish ponds
C. use of phosphates and hydrocarbons
D. established national parks
_____12. Why does human impact on the environment is often more dramatic than the impact of
most other living things? Because humans have a greater...
A. need for water
B. need for food
C. ability to adapt to change
D. ability to alter the environment
_____13. Which situation has the most negative effect on the ecosystems of Earth?
A. use of air pollution controls
B. recycle glass, plastic and metals
C. use of natural predators
D. increasing human population.
_____14. What is the irreversible effect of both deforestation and water pollution to the
environment?
A. extinction of species
B. depletion of atmospheric CO2 levels
C. increase in renewable resources
D. thinning of the ozone shield
_____15. What will happen to the natural resources if the population increases?
A. stays the same
B. B . It decreases
C. C. also increases
D. D. Population does not impact the environment

5. Prepared By: Checked By: Noted By:
ANGELITA A. MENESES ORLANDO Y. YUMUL JR. ARNEL PABLO L. AGUSTIN
SSTI-III SST-III/TIC-in Science Principal I