1- Cells

Question 1

name all life processes

Answer 1

MRS GREN!

Movement
Respiration
Sensitivity
Growth
Reproduction
Excretion
Nutrition

Question 2

what are the three parts of an animal cell?

Answer 2

nucleus, cell membrane, cytoplasm

Question 3

name the 6 parts of a plant cell

Answer 3

cell wall
cell membrane
cytoplasm
chloroplasts
vacuole
nucleus

Question 4

function of nucleus

Answer 4

carries genetic info and controls what happens inside the cell

Question 5

function of cytoplasm

Answer 5

substance where chemical reactions happens

Question 6

function of vacuole

Answer 6

contains a liquid called cell sap which keeps the cell firm - cell sap is a weal solution of sugar and salts

Question 7

function of cell membrane

Answer 7

controls what passes in an out of the cell

Question 8

function of cell wall

Answer 8

made of cellulose which gives the cell it’s shape and protects it

Question 9

why do yeast cells need to absorb sugar?

Answer 9

because they have no chloroplasts they are incapable of photosynthesising.

Question 10

what is a tissue?

Answer 10

a living structure of a group of cells with the same function and structure, which work together to complete a particular job

Question 11

what is an organ?

Answer 11

an organ is a group of similar tissues which work on similar jobs

Question 12

what is an organ system?

Answer 12

a group of organs working together on similar jobs

Question 13

how is a palisade cell designed for photosynthesis?

Answer 13

• large surface area

- packed with chloroplasts which contain the green pigment chlorophyll

Question 14

how is a root hair cell designed for absorbing?

Answer 14

• the long root hair cell increases the surface area of the root
• a very thin cell wall

Question 15

how is a nerve cell adapted to do its job?

Answer 15

• long
• connections at each end
• can carry electrical signals

Question 16

what is a unicellular organism?

Answer 16

a living thing that is just one cell, such as:

• bacteria
• protozoa
• unicellular fungi

Question 17

why do some bacteria have a flagellum?

Answer 17

it is a tail-like part of the cell that can spin, moving the cell along

Question 18

how is a protozoa adapted to do it’s job?

Answer 18

• it produces pseudopodia (false feet) that let it move about
• its pseudopodia can surround food and take it inside the cell
• contractile vacuoles appear inside the cell and merge with the surface to remove waste

Question 19

how does yeast reproduce?

Answer 19

by producing a bud. the bud grows until it is large enough to split from the parent cell as a new yeast cell

Question 20

what do cells need in order to photosynthesise?

Answer 20

• carbon dioxide
• water
• light

Question 21

what are some adaptations leaves have?

Answer 21

• thin (provides a short distance for carbon dioxide to move by diffusion into the leaf)
• contains chlorophyll: absorbs light
• stomata: allows carbon dioxide to move by diffusion into the leaf
• guard cells: to open and close the stomata depending on the conditions
• network of tubes (xylem and phloem): to transport water and food

Question 22

how is a sperm cell designed to fertilise eggs?

Answer 22

• a sperm cell is very small and jas a little tail which provides movement
• its head contains enzymes which allow it to digest it’s way through an egg membrane, so the two nuclei can join
• it contains chromosomes in the nucleus -these carry genetic information from the father, which will be passed on to the offspring

Question 23

how is an ovum designed to be fertilised?

Answer 23

an ovum is large and bulky because no active movement is needed

it contains yolk which provides a large food store needed for the developing young organism, once it’s fertilised

it contains chromosomes which carry genetic information from the mother - this will be passed on to the offspring