Experiment on the Growing Up in Different Environments

1618 Words7 Pages
Discussion Introduction: In my biology unit 1/2 class i had to conduct two experiments. This included planting two plants and growing them in different environments- in my experiment I had one growing in soil and the other one in cotton. The one that had soil looked after more than the one in cotton. The other experiment was watching my dog for 5 minutes a day. With my plant experiment I had to plant broad beans throughout the week the plant did and didn’t show gas exchange, photosynthesis, Growth and reproduction, digestion and absorption of nutrients, distribution of materials either as circulation or movement of liquid plants and removal of wastes. Gas Exchange: Plant: The exchange of oxygen and carbon dioxide in the leaves, stems and roots, occurs by diffusion through special opening in the epidermis called stomata. When the stomata are closed, the exchange of oxygen, carbon dioxide and water vapour between the plant and its environment virtually stops. For the stomata to close it is controlled by the guard cells. The guard cells opens the stomata back open when needed. The structure of the leaves allows gas exchange to occur at a sufficient rate for survival without the need for specialised respiratory structure. The gas exchange needs a balance with water conservation. While stomata are open, water vapour can be lost to the environment. This is particularly important for plants that live in dry environments. Dog: the gas exchange for my dog happens internal. Gas exchange relies on diffusion- therefore concentration gradients need to be maintained. For oxygen to continually diffuse into capillaries around alveoli, oxygen needs to be transported away from the site. Respiratory pigments such as haemoglobin carry oxygen in the blood from lungs and release oxygen into cells. Rhythmic pumping of the heart ensures continuous flow of blood

More about Experiment on the Growing Up in Different Environments

Open Document