NEET Biology Notes PDF 2027 | Class 11 & 12

NEET HARD - Ch2 Human Reproduction 🧬 Chapter 2: Human Reproduction - HARD LEVEL NEET 2027 Q1. Assertion: Spermatogenesis is temperature dependent. Reason: Scrotum provides 2-3°C lower temperature than body. a) Both true, Reason correct explanation b) Both true, Reason not correct explanation c) Assertion true, Reason false d) Both false Q2. Match List-I with List-II: A. Leydig cells - 1. Nourishment of sperm, B. Sertoli cells - 2. Testosterone, C. Acrosome - 3. Hyaluronidase, D. Middle piece - 4. Mitochondria a) A-2, B-1, C-3, D-4 b) A-1, B-2, C-4, D-3 c) A-2, B-3, C-1, D-4 d) A-4, B-1, C-2, D-3 Q3. Which of the following statements is INCORRECT regarding menstrual cycle? a) LH surge induces rupture of Graafian follicle b) Progesterone is secreted by corpus luteum in luteal phase c) FSH levels are highest during ovulation d) Endometrium is shed during menstrual phase Q4. If a secondary oocyte is fertilized, the resulting zygote will have a) 23 chromosomes b) 46 chrom...

*NEET 2027: Chapter 13 Biodiversity and Conservation - Detailed Short Notes* 🌍   _Class 12 Biology | NCERT Line-by-Line + PYQ  4Q Tak Aa Sakte Hain_   ### *1. Biodiversity - Concept & Levels*   - *Term*: Edward Wilson = Father of Biodiversity. Coined 'biodiversity'.   - *Definition*: Combined diversity at all levels of biological organization.   - *3 Levels with NEET Examples*: **Level** **Meaning** **NEET Example** **Genetic Diversity** Diversity within species due to genes 1. 50,000 rice varieties in India  2. 1,000 mango varieties  3. Rauwolfia vomitoria = Reserpine variation **Species Diversity** Diversity at species level Western Ghats amphibians > Eastern Ghats **Ecological Diversity** Diversity at ecosystem level India: Deserts, Rainforests, Mangroves, Coral reefs, Alpine meadows ### *2. Magnitude of Biodiversity*   - *Described Species*: 1.7-1.8 million. Robert May estimate: Global = 7 million spe...

NEET Dropper here! Dropping complete Chapter 11 Notes for all NEET 2027 Aspirants 🔥  ### *NEET 2027: Chapter 11 Organisms and Populations - Expanded Notes*   _Class 12 Biology | NCERT Line-by-Line + PYQ + Diagrams_   ### *1. Organism & Its Environment*   - *Ecology*: Term by Ernst Haeckel. Study of interactions among organisms & with abiotic environment.   - *Hierarchy*: Organism → Population → Community → Ecosystem → Biome → Biosphere.   - *Major Abiotic Factors*:       1. *Temperature*: Most ecologically relevant. Affects enzyme kinetics. Avg temp on land: 0-50°C.       2. *Water*: Life originated in water. Desert = <10cm rainfall. Productivity of ocean limited by light.       3. *Light*: Photosynthesis, foraging, migration, reproduction. UV = harmful.       4. *Soil*: Weathering of rocks. pH, minerals, topography decide vegetation. ...

Hello friend. I am NEET dropper today I'm sharing complete notes*CHAPTER 7 - HUMAN HEALTH AND DISEASE SHORT NOTES* 🩺 *NCERT Class 12 ### *8.1 HEALTH* *Definition*: State of complete physical, mental, social well-being. *Not merely absence of disease*. ### *8.2 COMMON DISEASES IN HUMANS* **Disease** **Pathogen** **Vector/Mode** **Symptom** **Test** **Typhoid** *Salmonella typhi* Food/Water Sustained fever 39-40°C **Widal test** **Pneumonia** *Streptococcus pneumoniae*, *Haemophilus influenzae* Droplets Alveoli filled with fluid - **Malaria** *Plasmodium* **Female *Anopheles*** Chills + Fever every 3-4 days Blood smear **Amoebiasis** *Entamoeba histolytica* Food/Water Constipation, cramps Stool test **Ascariasis** *Ascaris* Food/Water Internal bleeding, anemia Stool test **Elephantiasis** *Wuchereria* **Female *Culex*** Lymph nodes me swelling Blood test **Ringworm** *Microsporum, Trichophyton* Soil, Towel Dry scaly lesions on skin - *Malaria Life Cycle Imp Points*:   1. *Spor...