Science Review #4

Observations may be qualitative or quantitative. Which is an example of a quantitative observation?

• Spiders have eight legs.

• The leaves are full of dew.

• The rain is noisy as it falls.

• The fly has several pairs of wings.

Which of the following is an observation?

• The bread is green due to the moisture and molds in it.

• If there is milk in the recipe, then the yeast makes the dough rise.

• Milk has higher density than water, but water has greater density oil.

• The proportion of the milk and oil in the recipe is 4:1.

Inferences explain why those observations are present. Which of the statements below are examples of inferences?

i. The pickles has 5 cups of sugar and 1 cup of salt.

ii. A maximum of 2 kg of cucumber is needed for the pickles.

iii. The cucumber has a longer shelf life due to the sugar added to it.

iv. If salt and sugar are combined with the cucumber, its shelf life is extended.

v. Salt lengthens the shelf life of the cucumber because of its pre- servative properties.

• i, ii and iii

• iii, iv and v

• iv and v

• All of them are inferences

Which of the following is NOT correctly grouped?

• Celsius, Kelvin, Temperature, Fahrenheit, Rankine

• distance, meter stick, inches, miles, lightyears

• beam balance, weighing scale, kilograms, mass, pounds

• century, time, nanoseconds, lightyears, forthnight

Suppose you want to test how sunlight affects camote leaves. Below are the steps you must do in order to achieve this. What is the first thing to do?

• Take measurements of the size of the camote leaves; tabulate results and compare.

• Conclude that the leaves do not grow rapidly when placed un der the shade.

• Setup an experiment where some camote plants are exposed to sunlight and some are shaded.

• Guess which leaves grow faster after several days or months.

Suppose you want to test the effect of colored plastics, used as shade, on the growth of selected plants. Which of the following is NOT part of the procedure?

• conclude that black cloth materials can enhance the growth of

  the plants effectively

• set up an experiment using plants of the same variety and plastics of different colors

• guess that clear plastics is the best type of plastic on the growth of the selected plants

• measure the height of the plants before and after shading them with colored plastics

To test the effect of water on the weight of the rats in an experiment, two cages were used. One cage is given unlimited supply of water while the other cage is given the usual amount of water. After one week, the weights were taken and compared. Which is the independent variable?

• size of cages

• amount of food

• supply of water

• initial weight of rats

Gloria experimented on the effects of water on the growth of gumamela. She planted plants of the same gumamela variety, in the same-sized pots, with the same type of soil. She then placed these setups un. der the sun and in the same open space. She watered one pot daily, and the other less frequently.

Which are the controlled variables in the experiment?

• sun, air and water

• soil, sun and water

• pots, air and water

• plants, pots and sunlight

Gloria experimented on the effects of water on the growth of gumamela. She planted plants of the same gumamela variety, in the same-sized pots, with the same type of soil. She then placed these setups un. der the sun and in the same open space. She watered one pot daily, and the other less frequently.

Which is the independent variable?

• Watering of the plants

• Exposure under the Sun

• Growth of Gumamela Plant

• Exposure to the Air in open space

A science student concluded that "Sand makes the brick stronger," what then must be the question?

• ls sand good for the brick?

• How does sand affect the brick?

• How many pails of sand can make the brick stronger?

• Can brick be made alone without sand?