Biology-B2-2a Flashcards
Name five parts of a cell that both plant and animal cells have.
- Cell Wall
- Nucleus
- Mitochondria
- Ribosomes
- Cell Membrane
Name three things that a plant cell has that an animal cell doesn’t.
- Cell Wall
- Vacuole
- Chloroplast
Where is the genetic material found in:
a) Bacterial cells
b) Animal cells
a)
b)
What is diffusion?
Diffusion is the spreading out of particles from an area of high concentration to an area of low concentration.
Name three substances that can diffuse through cell membranes and two that can’t.
Can: -Glucose -Amino Acids -Water Can't: -Starch -Proteins
Give three ways that a palisade leaf cell is adapted for photosynthesis.
- It is packed with chloroplasts for photosynthesis. More of them are crammed at the top of the cell, so they’re nearer the light.
- It is a tall shape which means there is a lot of surface area exposed down the side for absorbing CO2 from the air in the leaf.
- It is a thin shape which means that you can pack loads of them in at the top of a leaf.
Paliside leaf cells are grouped together at the top of the leaf where most of the photosynthesis happens.
Give thee ways that a sperm cell is adapted to swimming to an egg cell.
- The main functions of an egg cell are to carry the female DNA and to nourish the developing embryo in the early stages. The egg cell contains huge food reserves to feed the embryo.
- When a sperm fuses with the egg, the eggs membrane instantly changes its structure to stop any more sperm getting in. This makes sure the offspring end up with the right amount of DNA.
- The function of a sperm is basically to get the male DNA to the female DNA. It has a long tail and a streamlined head to help it swim to the egg. There are a lot of mitochondria in the cell to provide t he energy needed.
- Sperm also carry enzymes in their heads to digest through the egg cell membrane. Sperm and eggs are very important cells in reproduction.
What is a tissue?
A tissue is the group of similar cells that work together to carry out a particular function. It can include more than one cell like in mammals.
What is an organ?
It is a relatively independant part of the body that has one or more special functions.
Give three examples of organs.
- Eyes
- Ears
- Heart
- Lungs
- Liver
Give three examples of tissues in the human stomach and explain what job they do.
??
Name one organ system.
Digestive system
Give an example of one plant tissue and plant organ.
??
Write down the equation of photosynthesis.
Carbon dioxide + Water = Oxygen + Glucose
What is the green substance found in leaves that absorbs sunlight?
Chlorophyll
