definitions unit 2

Question 1

cell

Answer 1

the smallest unit that can perform the functions of life

Question 2

multi cellular

Answer 2

many cells

Question 3

unicellular

Answer 3

one cell

Question 4

organelles

Answer 4

a structure within a cell

Question 5

selectively permeable

Answer 5

allowing only certain materials to pass through

Question 6

permeable

Answer 6

allowing materials to pass through

Question 7

impermeable

Answer 7

allowing no materials to pass through

Question 8

vascular tissues

Answer 8

in plants tissues that connect the root system and the shoot system

Question 9

phloem tissues

Answer 9

in plants tissues that sugars to the rest of the plant

Question 10

xylem tissues

Answer 10

in plants the tissue that conducts water and minerals absorbed by root cells to every cell in the plant

Question 11

root hairs

Answer 11

on a plant root the single epidermal cell

Question 12

transpiration

Answer 12

the loss of water from a plant from evaporation

Question 13

tissues

Answer 13

a group of cells having the same function or structure

Question 14

organs

Answer 14

a group of tissues that work together to perform a specific function

Question 15

digestive system

Answer 15

a group of organs that work together to break down food and eliminate wastes

Question 16

respiratory system

Answer 16

a system that moves air in and out of the body

Question 17

circulatory system

Answer 17

a system that transports food and oxygen throughout the body

Question 18

alveoli

Answer 18

in the lungs a tiny sacs that are on the end of a bronchiole

Question 19

capillaries

Answer 19

the smallest type of blood vessels that connects arteries and veins

Question 20

excretory system

Answer 20

the system that regulates blood composition and gets rid of waste fluids

Question 21

nervous system

Answer 21

body system that senses internal and external changes, it controls an co-ordinates body activities

Question 22

artery

Answer 22

a blood vessel that carries oxygen-rich blood from the heart

Question 23

guard cells

Answer 23

in leaf: cells that surround openings called stoma

Question 24

nuclear membrane

Answer 24

thin outer membrane that surrounds the cells nuclease

Question 25

osmosis

Answer 25

the diffusion of a solvent through a selective permeable membrane

Question 26

stomata

Answer 26

tiny openings on the underside of the plant leaf that let air in