Biology- e-learning portal --Photosynthesis and plant organs

Hi Students,

Here is the fifth list of sites you can go to to learn science in a fun way.
The site is good for quick revisions and introductions to the topics.


Topic: Photosynthesis and plant organs

1 experiments to see if chlorophyll and light are needed to make starch

http://kerala.skoool.in/content/KS3%20LOs/biology/chlorophyll_light_exp/index.html

2 the role of the leaf in photosynthesis
http://kerala.skoool.in/content/KS3%20LOs/biology/leaf_role_photosynthesis/index.html

3 testing a leaf for starch
http://kerala.skoool.in/content/KS3%20LOs/biology/leaf_starch_test/index.html

4 photosynthesis
http://kerala.skoool.in/content/KS3%20LOs/biology/photosynthesis/index.html

5 the rate of photosynthesis
http://kerala.skoool.in/content/KS3%20LOs/biology/photosynthesis_rate/index.html

6 difference between photosynthesis and respiration
http://kerala.skoool.in/content/KS3%20LOs/biology/photosynthesis_respiration/index.html

7 plant mineral requirements
http://kerala.skoool.in/content/KS3%20LOs/biology/plant_mineral_req/index.html

8 plant organs
http://kerala.skoool.in/content/KS3%20LOs/biology/plant_organs/index.html

9 water and mineral salt uptake
http://kerala.skoool.in/content/KS3%20LOs/biology/temp_enzymes/index.html



Cheers

Lesson on digestion of food

Hi,







I hope the 3 videos have helped you to understand:

-peristalsis, the wave-like rhythmic movement in the stomach and intestines to churn food and move food along the gut.

-mechanical digestion or chewing in the mouth. teeth break food into smaller particles

-chemical digestion or breaking down of food into smaller molecules so that they can be absorbed into the blood stream.

-producctionof of enzymes in mouth, amylase digests starch into maltose.

-production of enzyme pepsin and hydrochloric acid in the stomach. these help in the breakdown of proteins and kill germs in the food respectively.

-production of lipase and digestion of fats in the small intestine.

-villi in the small intestine to increase surface area in contact with digested food so that absorption is more efficient.

-absorption of digested food, small diffusible molecules into the blood stream.

-the circulatory system carries the food in the blood to all parts of the body for use or assimilation.

Cheers

Hormones

Hi,

Some really cool videos for your viewing pleasure. Learn where hormones are produced, how they travel to the target organs and how they help to co-ordinate processes in our bodies.

The endocrine glands (places which secrete hormones) have a rich supply of blood capillaries in them to carry the chemical messengers(hormones)to all parts of the body where the blood stream flows. the target cells have complementary receptor on their surface membranes. these receptors will bind with the hormones and produces the specific response. After the hormones have done their functions will be destroyed in the liver.












Cheers

Lesson 11: Photosynthesis- nutrition in plants

Hi,

Here are some 31 colourful and cheerful powerpoint slides to zest up your revision of this topic. the concepts covered by these slides include:

• organisation of plant-cells, tissues, organs, systems and organism
• specialised cells, adaptation for their functions
  
• palisade cells-contain chloroplasts for photosynthesis
• root hair cells-have large surface area to volume ratio for quick absorption of water and dissolved mineral ions
• guard cells- bean shaped, have unevenly thickened wall for gaseous exchange with the environment
  
• pollen cells- sex cells for adaptation for pollination, used for sexual reproduction
• annotated plant cells
• mitochondria-site of cellular respiration
• chloroplast-site of photosynthesis
• plants are producers in the ecosystem- change sunlight energy into chemical energy aka glucose molecule
• glucose- a carbohydrate which the plant will use to change into proteins, fats and other forms of carbohydrates
• uses of glucose in plant-respiration, 80% efficiency in changing it to other froms and for storage
• cross section of leaf, annotated
• equation for photosynthesis, models to illustratae the synthesis from water and carbon dioxide
• short questions
  

Unit 9 Photosynthesis in Green Plants

View more OpenOffice presentations from Dr samuel Aylward.

Cheers

Lesson 9: The digestive systems and enzymes

Hi,

Here are more powerpoint slides to revise the topic on digestion. The 30 slides cover the following concepts:

• annotated diagram of the alimentary canal
• ingest, digest, absorb, assimilate, egest
• deficiency diseases-scurvy, osteoporosis, rickets, night blindness
• balanced diet
• sources, functions of protein
• sources, functions of lipids
• sources, functions of carbohydrates
• sources, functions of minerals, vitamins, roughage, water
• foot tests-Biuret test, grease spot test, iodine solution test, Benedict's test
• teeth for mechanical digestion
• stomach for protein digestion
• small intestine-where all classes of food are digested completely
  
• liver-storage, process food, production of urea by deamination
• pancreas-production of digestive enzymes
• large intestine-absorption of water
• rectum-storage of bacteria, undigested food and roughage
• enzymes are biological catalysts
• proteases-in stomach and pancreatic juice
• carbohydrase-in mouth and pancreatic juice
• lipase-in pancreatic juice
• final products of digestion-amino acids, fatty acids and glycerol, glucose
• enzymes have active site, lower activation energy and are protein in nature
• biological enzymes are involved in bread and alcohol making by yeast cells, removing stains in clothes by washing powders
• absorption, villi, microvilli
• assimilation- glucose for respiration and storage as glycogen, amino acids for making proteins for growth, making enzymes, making hormones, fatty acids and glycerol for making cell membrane, hormones, storage under the skin
• obesity, diabetes, heart disease due to over eating
• short questions
  

The Digestive System

View more OpenOffice presentations from Dr samuel Aylward.

Cheers