Explanation

The magnetic materials include cobalt, iron, and nickel.

Plastic cannot be magnetized nor can it be attracted to a magnet.

Explanation

In Mendel's pea plant experiments,

When he crossed purebred pea plants with contrasting traits (like purple and white flowers),

The F1 generation offspring all exhibited the dominant trait (purple flowers in this case).

The recessive trait (white flowers) disappeared in the F1 generation but reappeared in the F2 generation when the F1 plants self-fertilized. T

his reappearance of the recessive trait in the F2 generation confirmed that the recessive allele was still present in the F1 generation, just masked by the dominant allele. 

Explanation

Explanation

Papaya plants are mostly dioecious, meaning male and female flowers are on separate plants, requiring cross-pollination.

Wind and insects help transfer pollen from male to female flowers for fruit production.

Explanation

Electric current is the flow of electrons in a conductor.

The force required to make current flow through a conductor is called voltage and potential is the other term of voltage.

Explanation

A rain gauge is a meteorological instrument to measure the precipitating rain in a given amount of time per unit area.

The instrument consists of a collection container that is placed in an open area.

Explanation

To calculate the population density, you will divide the population by the size of the area.

formula:

Population Density = Number of People/Land Area.

The unit of land area should be square miles or square kilometers.

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ND1-2-2023

Explanation

Amylase is an enzyme that catalyzes the hydrolysis of starch into sugars.

All amylases are glycoside hydrolases.

It is used in breadmaking.

Additional information:

Protease: 

is an enzyme that catalyzes proteolysis.

Lipase:

Is an enzyme that catalyzes the hydrolysis of fats.

Peptidase:

is an enzyme that breaks down peptides into amino acids.

Explanation

Washing soda is also known as sodium carbonate (Na2CO3).

It is used to remove permanent hardness of water.

Permanent hardness is caused by the presence of magnesium and calcium sulfates or chlorides in water, which cannot be removed by boiling.

Washing soda helps to precipitate these minerals, making the water softer.

Explanation

The biosphere is made up of the parts of Earth where life exists—all ecosystems. 

The biosphere is defined as the region on, above, and below the Earth's surface

The biosphere is a zone on the surface of the earth where soil, water, and air combine to sustain life.

Life can only occur in this zone

ND-21-5-2023