1.1

Question 1

Atoms

Answer 1

The smallest unit of an element that has the chemical properties of the element. All matter is composed of atoms

Question 2

Molecules and macromolecules

Answer 2

Atoms that bond with each other to form molecules. A polymer such as polypeptide is formed of many molecules bonded together and is called macromolecule. Carbohydrates, proteins, nucleic acids (dna and rna) are important macromolecules.

Question 3

Cells

Answer 3

Simplest unit of life. It is surrounded by a membrane and contains a variety of molecules And macromolecules. Unicellular organisms are composed of one cell. But the multicellular organisms, such as plants and animals contain many cells.

Question 4

Tissues

Answer 4

In multicellular organisms many cells of the same type associate with each other to form tissues. Like muscle tissue

Question 5

Organs

Answer 5

Composed of two or more types of tissue. The heart has various tissues like muscle, nervous, and connective tissue

Question 6

Organism

Answer 6

Belonging to a particular species, which is a related group of organisms that share a distinctive form and set of attributes in nature. The members of the sane species are closely related genetically

Question 7

Population

Answer 7

Group of organisms of the same species that occupy the same environment

Question 8

Community

Answer 8

An assemblage of populations of different species. The types of species found in a community are determined by the environmentof populations of various species. These are determined by the environment and by the interactions of species with each other

Question 9

Ecosystem

Answer 9

These are formed by interactions of a community of organisms with their physical environment

Question 10

Biosphere

Answer 10

Includes all the places on earth where living organisms exist. Air, water,land, and soil.