Biology M5 Exams

Question 1

What is the independent variable on the Microscopy practical

Answer 1

The concentration

Question 2

What is the dependant variable of the Microscopy practical

Answer 2

The change in mass

Question 3

What is the control variable of the Microscopy experiment

Answer 3

• Temperature
• Volume of liquid
• Time
• Surface are of Potato

Question 4

Explain the Step by Step method of the Osmosis and Potato Practical

Answer 4

1. Cut 6 2x2x2 cubes of potato
2. In 6 different test tubes, place a sugar+water solution which all have different concentration
3. Place one cube in each test tube and time for 5 mins
4. After 5 mins, take each potato cube out and remeasure it
5. The largest potato will be the cube which was placed in the lowest concentration on solution

Question 5

Describe the Microscopy experiment

Answer 5

1. Make your slide, make sure there are as little air bubbles inside and you do not touch the bottom or top of the slide
2. Place the slide on the stage, and secure slide with stage clips
3. Turn on the light
4. Look though the eye piece and use the coarse adjustment and focus adjustment know to better your view of the slide
5. Record any findings and dispose of the slide correctly

Question 6

Explain the Culturing Microorganism in a Lab experiment

Answer 6

1. Cut even cubes of agar jelly
2. Place the agar jelly in a Petri dish
3. Add the microorganism onto the agar jelly
4. Place the lid of the Petri dish on top
5. Tape the lid on and flip upside down
6. Keep at a 25 degree temperate for safe results

Question 7

What is the function and adaptation of sperm

Answer 7

Function - to get the male DNA to the female DNA

Adaptation - streamlined - lots of mitochondria to produce energy - long tail

Question 8

What is the function and adaptation of a nerve

Answer 8

Function - to send electrical impulses around the body

Adaptation - to cover more distance - created a branched connections to form a connection with other nerves

Question 9

What is a specialised cell and give 5 examples

Answer 9

A specialised cell is a cell that has changed to perform a specific role

1. Nerve cell
2. Sperm cell
3. Muscle
4. Root hair cell
   5.

Question 10

What is the function and adaptation of a root hair cell

Answer 10

Function - to absorb water from soil

Adaptation - large surface area

Question 11

What are the equations for real size, magnification and image size

Answer 11

Real size = image size/magnification

Image size = magnification x real size

Magnification = image size/ real size

Question 12

Rate of reaction equation

Answer 12

Rate of reaction - amount of reaction used/time

Rate of reaction - amount of product formed/time

Question 13

What is the difference between Eukaryotic and and Prokaryotic cells

Answer 13

Eukaryotic cells have membrane-bound organelles e.g. mitochondria or nucleus

Question 14

Give an example of a eukaryotic and prokaryotic cell

Answer 14

Eukaryotic - plant or animal cell

Prokaryotic - bacterium cell