biology

Question 1

why do cells undergo cell division

Answer 1

Allows organisms to reproduce, to grow and to repair damage

Question 2

what are the major cellular organelles

Answer 2

Cytoplasm, Cell membrane, Nucleus, Mitochondria, Vacuoles, Cell wall, Vacuole, Chloroplasts

Question 3

what are the stages of mitosis

Answer 3

Interphase, Mitosis, Cytokinesis

Prophase, Metaphase, Anaphase, Telophase

Question 4

prophase (4)

Answer 4

nuclear membrane breaks down, centrioles move to opposite poles of the cell, spindle fibres form, chromatin shortens and thickens

Question 5

metaphase

Answer 5

spindle fibres from the centrioles attach to the centromeres and move the sister chromatids to the equator of the cell

Question 6

anaphase

Answer 6

chromosomes are separated because the spindle fibres retract and move to opposite poles of the cell

Question 7

telophase (4)

Answer 7

spindle fibres disappear, nuclear membrane reappears, cell membrane pinches, chromosomes become chromatin again

Question 8

digestive system

Answer 8

The organ system is made up of the mouth, esophagus, stomach, intestines, liver, pancreas, and gall bladder; the system that takes in breaks up digests food, and then excretes the waste.

Question 9

respiratory system

Answer 9

The organ system that is made up of the nose, mouth, trachea, bronchi, and lungs; the system that provides oxygen for the body and allows carbon dioxide to leave the body

Question 10

circulatory systems

Answer 10

The organ system is made up of the heart, the blood, and the blood vessels; the system that transports oxygen and nutrients throughout the body and carries away wastes.

Question 11

how are the systems connected

Answer 11

The circulatory system, which is made up of the heart and blood vessels, supports the respiratory system by bringing blood to and from the lungs.

Question 12

main organs of the digestive and tissue

Answer 12

The Stomach and intestines - epithelial tissue and muscle tissue

Question 13

main organ of the respiratory and tissue

Answer 13

lungs

Question 14

main organ of the circulatory and tissue

Answer 14

the heart- muscle tissue

Question 15

mitosis in a plant cell

Answer 15

The cell plate forms down the middle of the cell, splitting it into two daughter cells separated by a new wall. When division is complete, it produces two daughter cells.

Question 16

mitosis in an animal cell

Answer 16

each cell divides into 2 daughter cells

Question 17

gas exchange

Answer 17

Oxygen enters the bloodstream in the lungs by diffusion. The alveoli have very thin walls and oxygen and carbon dioxide diffuse through the walls of the capillaries and the walls of the alveoli. the alveoli are located at the end of each bronchi branch. as blood picks up the oxygen it is carried to the heart and away to other parts of the body and at the same time, excess carbon dioxide diffuses from the cells into the blood it is then carried by the blood to the lungs where it diffuses again out into the air.

Question 18

how is the circulatory system connected to the respiratory system in the human body

Answer 18

By transporting blood to and from the lungs so we can breath

Question 19

mitochondria

Answer 19

responsible for cellular respiration and makes energy available to the cell. glucose + oxygen -> carbon dioxide + water +usable energy

Question 20

nucleus

Answer 20

stores the cells DNA

Question 21

cell wall

Answer 21

only in plant cells and provides support for the cell and protection from physical injury

Question 22

cell membrane

Answer 22

supports the cell and allows some substances to enter while keeping others out

Question 23

cytoplasm

Answer 23

all organelles inside the cell are suspended in the cytoplasm

Question 24

vacuole

Answer 24

stores water and other waste, acts like a storage unit

Question 25

chloroplast

Answer 25

contains chlorophyll and gives off the colour green. chloroplasts absorb light energy which is used in photosynthesis