Biology Blogs For Class 11th, 12th & NEET

  Plastids in Plant Cells: Types, Structure & Functions Introduction Plastids are essential organelles found in plant cells and some algae. Coined by A.F.W. Schimper, the term "plastid" refers to various cell structures responsible for photosynthesis, pigment storage, and food storage. Understanding plastids—such as chloroplasts, chromoplasts, and leucoplasts—is fundamental in biology, especially for students preparing for exams in the UK and USA. 📚 Need Help with Biology Notes or Assignments? Still confused about Plastids, Chloroplasts, or Cell Organelles? Looking for detailed notes or affordable assignments on biology topics? 👉 Mail us at bionotesandassignments@gmail.com to get ready-to-use biology notes at a student-friendly price! What Are Plastids? | Definition & Importance Plastids are large organelles found in all plant cells. They are easily visible under a microscope. Plastids contain pigments and contribute to essential plant proce...

   What is Pollination? Types, Mechanisms &                             Importance in Plants Pollination is one of the most essential processes in the life cycle of flowering plants. It refers to the transfer of pollen grains from the anther (male part) to the stigma (female part) of a flower, enabling fertilization and seed formation. This process ensures the continuation of plant species and promotes genetic diversity when it occurs between different plants. 🌼 Types of Pollination in Plants Pollination in plants mainly happens in two ways: • Self-Pollination • Cross-Pollination 1. Self-Pollination In self-pollination, pollen grains are transferred from the anther to the stigma of the same flower or another flower on the same plant. This type of pollination maintains genetic purity but reduces diversity. Self-pollination occurs in two main forms: A) Autogamy Autogamy happens when the pollen grai...

                     Human Circulatory System  Human Circulatory system consist of heart , blood vessles & blood. Heart is mesodermal in nature. It is situated in the thoracic cavity , in between the two lungs.  The double membrane that surround the heart is known as Pericardium.  Pericardium circles the pericardial luid. Heart is 4 chamber with 2 upper small atria & 2 lower long ventricles. A thin wall seperates the left & right atria called Intra-atrial septum . The left & the right ventricles are seperated by thick Intra-ventricular septum .  The opening between the right atrium & right ventricles is guarded by a valve know as Tricuspid Valve . The Bicuspid Valve guards the opening between left atrium & left ventricles . The opening of right & left ventricles inton the pulmoery artry & the aorta. respectivelyare provided with the semilunalr valve. This valve in the heart allows...

      Anatomy Of Dicot Stems In Plants  Good Morning Students !  Do you know what is anatomy ?  What is Anatomy? Anatomy is the study of the internal structure of living organisms. When we talk about anatomy in plants, we're referring to how the different parts of the plant's body are arranged and structured. Today, we're going to focus on the anatomy of a dicot stem in plants. 1. Epidermis The epidermis is the outermost protective layer of the stem. It's the first line of defense against external factors. The epidermis is covered by a thin layer of cuticle , which helps in reducing water loss. It may also have a few stomata , which are tiny pores responsible for gas exchange. 2. Hypodermis Just beneath the epidermis lies the hypodermis . This layer consists of collenchymatous cells , which provide mechanical strength to the young stem. These cells are thickened at the corners, making the stem rigid and helping it to stand upright. 3. Cortex Next, we mov...

                           Mitochondria Structure                                             Mitochondria are filamentous or granular cytoplasmic organelles called "the powerhouse of the cell" . Under light microscope mitochondria are seen in the form of thread like structure , therefore they are named as Mitochondria .  Mitochondria was first observed by Kolliker  in 1880 & later Fleming in 1882. The term Mitochondria was given by Benda (1897).  Distribution - Mitochondria are uniformly distributed in the cytoplasm of all eukaryotic cells. They are absent in the prokaryotic cells.  Shape & Size - Saucer & Oval are two common shapes of mitochondria are found in cells. The size of mitochondria is 1-10 0.5 micrometers (µm).  Structure -  Mitochondria is double mem...

                               Cockroach  Classification -  Phylum - Arthropoda Class - Insecta  Subclass - Pterygota  Order - Orthoptera   Genus & Species - periplaneta americana ( Common Cockroach ) Blatta orientalis  Blatta Germanica (smallest Cockroach )  Features  -  Parental Care is not found in Cockroaches .  The word Cockroach is originated from the spanish word - Cucaracha . They are brown or black bodies animals .  They are belongs to tropical climate of africa .  They are nocturnal omnivores. They have long antenna , legs & flat extension of the upper  body wall that conceal head. Anatomy Of Cockroach -  Digestive  System - The alimentary canal is divided into three parts - forgut , midgut & hindgut. The mouth leads into a pharynx which leads into a narrow pasage called the Oesophagus . The Oesophagus opens i...

                          Sycon में Canal System Sycon, जिसे Scypha भी कहा जाता है, एक समुद्री जीव है जो आमतौर पर चट्टानों या अन्य सतहों से चिपका हुआ पाया जाता है। इस जीव का शरीर ट्यूब के आकार का होता है, जो एक बड़े छेद के माध्यम से बाहर की ओर खुलता है, जिसे Osculum कहा जाता है। इसके शरीर पर छोटे-छोटे छिद्र होते हैं, जिन्हें Spiracles और Ostia कहा जाता है, जिनके माध्यम से पानी अंदर प्रवेश करता है। यह पानी शरीर के अंदर Canal System से होकर बाहर निकलता है, और यह प्रक्रिया श्वसन के लिए आवश्यक होती है। हम Sycon के Canal System के आकार, इसके महत्व, प्रकार और कार्य के बारे में विस्तार से जानेंगे। Sycon प्रकार का Canal System Porifera (स्पॉन्जेस) जाति का एक अनूठा विशेषता है, जिसे Aquiferous Canal System भी कहा जाता है। यह शरीर के कई महत्वपूर्ण कार्यों जैसे पोषण, श्वसन, उत्सर्जन आदि में सहायक होता है। इतिहास की संक्षिप्त जानकारी स्कॉटलैंड के वैज्ञानिक ग्रांट ने स्पॉन्जेस (Sycon) पर गहरे अध्ययन किए और सबसे पहले Sycon के Canal...