Science Archives - Page 20 of 59 - CBSE Class Notes Online

Photorespiration occurs in

June 10, 2023June 10, 2023 - by Jaishree Gorane - Leave a Comment

Photorespiration occurs in C3 plants and involves several organelles. In chloroplasts, RuBP oxygenase reacts with RuBP, leading to the formation of PGA and PGly. Glycolic acid is produced in chloroplasts and then undergoes oxidation in peroxisomes, forming glyoxylic acid. Within mitochondria, glycine combines with CO2 and NH3, releasing CO2 and forming serine.

Biology / Chapter 13 - Photosynthesis in Higher Plants / Class 11 / NEET Biology / Question Answers / Science / Uncategorized

Photorespiration is a Wasteful process Justify

June 10, 2023June 10, 2023 - by Jaishree Gorane - Leave a Comment

Photorespiration is a wasteful process that inhibits photosynthesis by diverting RuBisCO activity from carbon fixation. It reduces the production of glucose and oxygen, important products of photosynthesis. In addition, photorespiration consumes ATP instead of producing it, resulting in a loss of energy for the plant. It also leads to a loss of fixed carbon through the release of carbon dioxide, which further reduces carbon gain.

Crassulacean Acid Metabolism (CAM) -Pathway, Significance, Examples

June 10, 2023June 10, 2023 - by Jaishree Gorane - Leave a Comment

Crassulacean Acid Metabolism (CAM) is a specialised form of photosynthesis in xerophytic succulents. CAM Plants absorb CO2 at night, store it as malic acid and release it during the day for carbohydrate production. They conserve water by closing the stomata during the day. Examples are orchids, cacti, aloe and pineapple. CAM enables efficient CO2 use, water conservation and reduced photorespiration in arid environments.

Biology / Chapter 6 Life Processes - Class 10 / Class 10 / Class 7 / Intext question Answers / nutrition / Question And Answer / Science / Uncategorized

Name the factors affecting Photosynthesis

June 7, 2023June 7, 2023 - by Jaishree Gorane - 1 Comment

Photosynthesis is influenced by various factors. Light intensity, temperature, carbon dioxide content and the availability of water are decisive factors. Sufficient light energy is crucial for the process, while an optimal temperature ensures enzyme activity. Sufficient carbon dioxide is necessary and water availability affects stomatal opening. Together, these factors affect the speed and efficiency of photosynthesis in plants.

Chloroplast – Definition, Structure, Distribution, function and Diagram

June 1, 2023June 22, 2023 - by Jaishree Gorane - 1 Comment

Chloroplasts, found in plant cells, are defined as organelles that contain chlorophyll. They have a complex structure with outer and inner membranes, stroma, thylakoid membranes and grana. Functionally, chloroplasts play a key role in photosynthesis. They convert light energy into chemical energy, produce ATP and oxygen and fixing carbon dioxide. The diagrams illustrate the structure and functions of chloroplasts in plant metabolism.

Biology / Biology Concepts / Chapter 6 Life Processes - Class 10 / Class 10 / NEET Biology / Notes / nutrition / Science / Science Facts

Salivary Glands – Definition, Types, Location, Size, Ducts, Diagram, Characteristics, Secretion, Structure and Function

May 30, 2023June 2, 2023 - by Jaishree Gorane - Leave a Comment

Salivary glands are exocrine glands responsible for saliva secretion. They have acinar cells for saliva synthesis and ductal cells for transport. Myoepithelial cells aid saliva movement. Major glands include parotid (largest), submandibular, and sublingual (smallest). Ducts are Stensen’s (parotid), Wharton’s (submandibular), and multiple (sublingual). Saliva lubricates, digests, and protects. Understanding their structure and function is vital.

Guard Cell Diagram

May 23, 2023May 25, 2023 - by Jaishree Gorane - 1 Comment

The diagram of the guard cells illustrates the specialised cells surrounding the stomata. These kidney-shaped cells with thicker outer walls swell when filled with water, causing the stomata to open. Conversely, they become flaccid when they lose water, causing the stomata to close. This process, controlled by vacuoles and cell walls, regulates gas exchange and water loss in plants.

Biology / Biology Concepts / Class 10 / Class 7 / NEET Biology / Notes / nutrition / Science Facts

Peristalsis- The Rhythmic Journey Through Your Body

May 18, 2023July 1, 2023 - by Jaishree Gorane - 2 Comments.

Peristalsis is a vital biological process that facilitates the movement of food through the digestive system. It involves rhythmic contractions of smooth muscles, creating a wave-like motion known as peristaltic waves. These waves propel food through the digestive tract and ensure efficient digestion and absorption of nutrients. Peristaltic movements are coordinated by the enteric nervous system and provide the motility necessary for proper gastrointestinal function.

Biology / Class 11 / Class 9 / Notes / Science / The Fundamental Unit Of Life -Chapter 5

Short Note on Mitochondria

May 16, 2023May 16, 2023 - by Jaishree Gorane - Leave a Comment

Mitochondria, the ‘Powerhouse of the cell’, are double-membrane organelles found in eukaryotic organisms. They function as the cell’s digestive system and play an important role in energy production through oxidative phosphorylation. With their unique structure and multiple functions, mitochondria regulate metabolism, promote cell growth, detoxify ammonia, induce apoptosis and maintain calcium ion balance, making them essential for cellular activities.

Biology / Biology Concepts / Chapter 6 Life Processes - Class 10 / Class 10 / NEET Biology / Notes / nutrition / Science / Science Facts

Emulsification of Fats

May 15, 2023June 29, 2023 - by Jaishree Gorane - 4 Comments.

Emulsification of fats is an important process in digestion in which large globules of fat are broken down into smaller droplets. This process is carried out by bile, a substance produced by the liver and stored in the gallbladder. Bile emulsifies fats by acting as a detergent, breaking down the fat into smaller droplets that can be easily digested and absorbed by the body. Without this process, the digestion and absorption of fats would be much less efficient.