Science 9 REVIEWER - 1st Quarter (Part 1)

Sarah wants to know if leaves can make food during nighttime. How can Sarah get an accurate answer to her question?

• cover one leaf of a potted plant with carbon paper for two hours and test for the presence of starch.

• cover the plant with a paper bag overnight and test for the presence of starch.

• put one potted plant under the sun and the other in a shaded area for two hours and test for the presence of starch

• put one potted plant in a very dark place overnight and test for the presence of starch

Jenny cannot roll her tongue, but her parents can. What is the genotype of both parents?

• Homozygous tongue roller

• Heterozygous non-tongue roller

• Heterozygous tongue roller

• Homozygous non-tongue roller

What will be the chance of having another child with attached earlobes, if all the children have free earlobes and the parents have both heterozygous free earlobes?

• 25%

• 50%

• 75%

• 100%

What is the primary role of conservation genetics in preventing extinctions?

• Breeding and reintroducing endangered species

• Protecting ecosystems from human activities

• Studying ancient extinct species

• Identifying keystone species

How can the loss of biodiversity resulting from species extinction affect the ecosystem?

• Increases ecosystem stability

• Improves resistance to environmental changes

• Disruption of ecosystem services and imbalances

• Decreased vulnerability of species

Of the following statements about protected areas like Palawan that have been established to preserve biodiversity, which one is not correct?

• About 3% of Palawan's land area is now protected

• National parks in Palawan are one of the many types of protected areas

• Most protected areas in Palawan are too small to protect species

• Management of a protected area in Palawan should be coordinated with management of the land surrounding the area

Why are ecosystem services rarely included in economic analysis?

• Their cost is difficult to estimate and people take them for granted

• They are not worth much and are usually not considered

• There are no laws that require investigation of ecosystem services in the environmental planning

• The ecosystem services only consider abiotic factors that affect the local government

Which of the following is or are used in carbon fixation during the light-independent reaction of photosynthesis?

• ADP only

• NADPH only

• ATP only

• NADPH and ATP

In what ways is the photosynthetic process important to the living world?

I.                    photosynthesis converts light energy into a form of energy all organisms can use

II.                 photosynthesis reduces the amount of carbon dioxide, a greenhouse gas in the atmosphere

III.               photosynthesis provides food for other organisms in the ecosystem

IV.              photosynthesis contributes oxygen to the atmosphere

• I, II, III, and IV

• I, II, and III

• I, II, and IV

• II, III, IV

Which of the following factors can affect the rate of photosynthesis in plants?

I.                    the amount of oxygen present in the atmosphere

II.                 the amount of carbon dioxide in the atmosphere

III.               the amount of light energy available

IV.              the amount of water absorbed by the roots

• I, II, and III

• I, II, and IV

• II, III, and IV

• I, III, and IV