General Biology Questions and Answers (Part 4)
This page contains important biology questions and answers useful for NEET, exams, and quick revision
Quick Revision – Key Biology Concepts
- Ecology studies interactions between organisms and environment
- The brain is the first organ to develop in the fetus
- Ultrafiltration occurs in kidneys during urine formation
- Genes carry hereditary information in organisms
- Evolution explains the origin and development of species
- Photosynthesis converts light energy into chemical energy
- Cytoplasm is the site of many metabolic activities in the cell
- Meiosis produces haploid cells for reproduction
- Tropism is directional growth in response to stimuli
- Liver performs vital metabolic and detoxification functions
What is oncology?
Oncology is the branch of medicine that specializes in the study, diagnosis, treatment, and research of cancer. Cancer is a complex group of diseases characterized by the uncontrolled growth and spread of abnormal cells in the body. Oncologists are medical professionals who are trained to diagnose and treat various types of cancer, and they work in collaboration with other healthcare providers to provide comprehensive care to cancer patients.
Key aspects of oncology include:
- Diagnosis: Oncologists use tools like CT scans, MRI, biopsies, blood tests, and genetic testing.
- Treatment: Includes surgery, chemotherapy, radiation therapy, immunotherapy, and hormone therapy.
- Palliative Care: Focuses on improving quality of life and managing symptoms.
- Research: Helps develop new therapies and understand cancer causes.
- Multidisciplinary Approach: Involves collaboration with other medical professionals.
Why the brain organ will first develop in the fetus?
The development of the brain as one of the earliest organs in a developing fetus is a complex process influenced by various factors.
- Early functionality: Controls vital functions like heartbeat and breathing.
- Neural tube formation: Occurs early and forms brain and spinal cord.
- Complexity: Brain needs more time to develop due to its complexity.
- Sensory input: Processes early environmental signals.
- Coordination: Helps regulate development of other organs.
- Evolutionary advantage: Early brain development improves survival.
What is ultrafiltration?
Ultrafiltration is a separation process used to separate particles and solutes from a liquid based on their size and molecular weight using a semipermeable membrane.
- Membrane selection: Pore size determines separation.
- Pressure driven: Liquid is forced through membrane.
- Size-based separation: Small molecules pass, larger ones are retained.
Applications include:
- Water purification
- Food processing
- Pharmaceuticals
- Biotechnology
- Dialysis
Is light involved in germination and fertilization?
Light plays a role in both processes but in different ways.
- Germination: Some seeds require light (photoblastic), others require darkness.
- Fertilization: Light does not directly affect fertilization but can influence behavior in animals.
What is gene?
A gene is a unit of heredity and a segment of DNA that carries genetic instructions.
Key points:
- Carries genetic information
- Made of DNA (A, T, C, G bases)
- Controls protein synthesis
- Has different forms called alleles
- Passed from parents to offspring
- Can mutate
- Regulated based on conditions
What is continuous variation?
Continuous variation refers to traits that show a wide range of values without clear categories.
Examples:
- Height
- Weight
- Blood pressure
It is influenced by multiple genes and environmental factors.
What is evolution, and what are two theories of it?
Evolution is the process by which organisms change over time.
Two theories:
- Darwin’s theory: Natural selection favors survival traits
- Wallace’s theory: Similar concept of natural selection
What is the difference between migrant and dispersal?
- Migration: Temporary and seasonal movement
- Dispersal: Permanent movement to new areas
Compare photosynthesis and chlorophyll
- Photosynthesis: Process of making food using sunlight
- Chlorophyll: Pigment that absorbs light
Photosynthesis equation:
CO₂ + H₂O → Glucose + O₂
What are triploblastic organisms?
They have three germ layers:
- Ectoderm
- Mesoderm
- Endoderm
These form different tissues and organs.
What is cytoplasm?
Cytoplasm is a jelly-like substance inside the cell where metabolic activities occur.
Functions:
- Supports organelles
- Site of reactions
- Helps transport substances
What is mycology?
Mycology is the study of fungi including mushrooms, molds, and yeast.
How do plants respond to stimuli?
Plants respond through:
- Phototropism (light)
- Geotropism (gravity)
- Hydrotropism (water)
- Thigmotropism (touch)
What is tropism?
Tropism is directional growth of plants in response to stimuli.
What are the functions of liver?
- Metabolism
- Detoxification
- Bile production
- Protein synthesis
- Storage of nutrients
- Regulation of cholesterol
What are the four valves in the heart?
- Aortic valve
- Pulmonary valve
- Mitral valve
- Tricuspid valve
What is ovulation period?
Ovulation is the release of an egg from the ovary, usually mid-cycle.
What is meiosis?
Meiosis is cell division producing four haploid cells for reproduction.
What are the parts of the ear?
- Outer ear
- Middle ear
- Inner ear
What is the role of HCl in digestion?
HCl works in the stomach, not the mouth.
Functions:
- Activates enzymes
- Kills bacteria
- Helps protein digestion
What is discontinuous variation?
Traits fall into distinct categories.
Examples:
- Blood group
- Earlobes
Difference between communicable and infectious diseases
- Infectious: Caused by microorganisms
- Communicable: Spread from person to person
| Topic | Key Concept |
|---|---|
| Ecology | Interaction with environment |
| Gene | Unit of heredity |
| Cytoplasm | Site of metabolic reactions |
| Meiosis | Haploid cell formation |
| Photosynthesis | Food production using sunlight |
