Biology Questions for SSC MTS

Cell - The Basic Unit of Life

Every living thing is made of cells. The cell has a nucleus (brain of the cell), cytoplasm (fluid inside), and cell membrane (outer cover). Plant cells also have a cell wall and chloroplasts. The mitochondria is called the powerhouse of the cell because it produces energy (ATP). Robert Hooke first observed cells in 1665. The cell theory was given by Schleiden and Schwann.

• Mitochondria = powerhouse, produces ATP energy
• Nucleus = control center, contains DNA
• Chloroplast = found only in plant cells, does photosynthesis
• Cell wall = found in plants, fungi, bacteria - NOT in animal cells
• Ribosome = site of protein synthesis
• Robert Hooke discovered cells; Schleiden and Schwann gave cell theory

Human Digestive System

Digestion starts in the mouth with saliva (contains amylase enzyme that breaks starch). Food goes to stomach where HCl and pepsin break proteins. The small intestine is the main site of digestion and absorption. The liver produces bile which helps digest fats. The large intestine absorbs water. The pancreas is both an endocrine and exocrine gland - it produces insulin and digestive enzymes.

• Saliva has amylase - breaks down starch/carbohydrates
• Stomach has HCl - kills bacteria and helps pepsin work
• Small intestine - final digestion and absorption of nutrients
• Liver - produces bile (stored in gallbladder) for fat digestion
• Pancreas - produces insulin (blood sugar) and digestive juices
• Large intestine - absorbs water, forms solid waste

Vitamins and Deficiency Diseases

Vitamins are essential nutrients our body cannot make on its own (mostly). They are either fat-soluble (A, D, E, K - remember ADEK) or water-soluble (B complex and C). Each vitamin deficiency causes a specific disease. These are direct one-line questions in SSC MTS - memorize the pairs.

• Vitamin A deficiency = Night blindness (cannot see in dim light)
• Vitamin B1 (Thiamine) deficiency = Beriberi (nerve/muscle weakness)
• Vitamin B12 deficiency = Pernicious anaemia
• Vitamin C deficiency = Scurvy (bleeding gums, weak immunity)
• Vitamin D deficiency = Rickets in children, Osteomalacia in adults (weak bones)
• Vitamin K deficiency = Blood does not clot properly

Diseases - Causes and Carriers

SSC MTS loves asking what causes a disease - is it a virus, bacteria, protozoa, or fungus. Also remember which diseases are spread by mosquitoes. Viral diseases cannot be treated by antibiotics. Bacterial diseases can. Remember: Antibiotics kill bacteria, NOT viruses - this itself is a common question.

• Viral diseases: Common cold, Influenza, Dengue, AIDS, Polio, Rabies, Chickenpox
• Bacterial diseases: TB (Tuberculosis), Cholera, Typhoid, Plague, Leprosy
• Protozoan diseases: Malaria (Plasmodium parasite), Amoebic dysentery, Kala-azar
• Malaria is spread by female Anopheles mosquito; Dengue by Aedes mosquito
• Fungal diseases: Ringworm, Athlete's foot
• Antibiotics work ONLY on bacterial infections, not viral

Blood and Circulatory System

Human blood has four components: RBC (red blood cells carrying oxygen via hemoglobin), WBC (white blood cells that fight infection), platelets (help in clotting), and plasma (liquid part). The heart pumps blood - it has 4 chambers. Arteries carry blood away from heart; veins bring blood back. Blood groups follow ABO system. AB is universal recipient, O is universal donor.

• RBC carries oxygen using hemoglobin (iron-containing protein)
• WBC = soldiers of the body, fight infection
• Platelets help in blood clotting
• AB blood group = universal recipient (can receive from anyone)
• O blood group = universal donor (can give to anyone)
• Arteries carry oxygenated blood (except pulmonary artery); Veins carry deoxygenated blood

Plant Biology - Photosynthesis and Basics

Plants make their own food through photosynthesis using sunlight, water, and CO2. Chlorophyll (green pigment in leaves) captures sunlight. Oxygen is released as a byproduct. Plants take in CO2 and release O2 during day (photosynthesis), but take in O2 and release CO2 during respiration (like animals). The phloem carries food; xylem carries water in plants.

• Photosynthesis formula: CO2 + Water + Sunlight = Glucose + Oxygen
• Chlorophyll is the green pigment that absorbs sunlight
• Xylem = water transport in plants (roots to leaves)
• Phloem = food transport in plants (leaves to all parts)
• Plants release oxygen during photosynthesis and CO2 during respiration
• Stomata are tiny pores on leaves for gas exchange

Human Endocrine System - Glands and Hormones

Glands release hormones directly into the blood. These hormones control body functions. The pituitary gland is called the master gland because it controls other glands. Thyroid gland controls metabolism. Insulin from pancreas controls blood sugar. Adrenaline is the fight-or-flight hormone released in stress or danger.

• Pituitary gland = master gland (controls all other glands)
• Thyroid gland - controls metabolism; deficiency causes goitre (iodine deficiency)
• Pancreas - secretes insulin; lack of insulin causes Diabetes
• Adrenal gland - secretes Adrenaline (emergency/stress hormone)
• Gonads (testes/ovaries) - produce sex hormones
• Goitre is caused by iodine deficiency affecting thyroid

• Confusing Anopheles (Malaria) with Aedes (Dengue) mosquito - both are mosquitoes but different diseases. Remember: A for Anopheles = A for Malaria (Plasmodium Anopheles), Aedes = Dengue
• Mixing up Vitamin D and Vitamin K roles - D is for bones (Rickets/Osteomalacia), K is for Klooting (Clotting of blood)
• Thinking arteries always carry oxygenated blood - the Pulmonary Artery is the exception as it carries deoxygenated blood from heart to lungs
• Saying antibiotics cure viral fever or dengue - antibiotics only work on bacteria. A very common trick question in SSC papers
• Confusing Xylem and Phloem - many write xylem carries food. Remember: X for Xylem = X for water (water is xtra important for roots), Phloem = Food (both start with different letters, use Ph-Food trick)

• ADEK = Fat soluble vitamins (A, D, E, K). All others - B and C - are water soluble. Fat ADEK vitamins are stored in body fat.
• For vitamin deficiency diseases use: A=sightAll (Night blindness), B1=BeBeriberi, C=sCurvy, D=Deformed bones (Rickets), K=Kan't Klot (no clotting). Each letter reminds you of disease.
• DONOR = O blood group (universal Donor starts with D but O is the One for all). RECIPIENT = AB (AB = Accepts Both = universal recipient). This rhyme helps: O gives to All, AB takes from All.
• MAD = Mosquito-spread diseases: Malaria (Anopheles), Dengue (Aedes). Two diseases, two different mosquitoes - never mix them.

• SSC MTS typically has 3-5 biology questions per paper, mostly from diseases, vitamins, and human body systems. These are pure memory-based - no calculation needed, just recall.
• Vitamin deficiency and disease-cause (virus vs bacteria vs mosquito) questions appear almost every year. Spend 80 percent of your biology prep time on these two areas alone.
• Questions are usually at recognition level - they give you a disease and ask the cause or vice versa. Example: Which mosquito spreads Dengue? or Deficiency of which vitamin causes Scurvy? Straightforward.
• Recent SSC MTS papers also asked about glands and hormones (especially insulin-diabetes link and pituitary as master gland) - this is an emerging pattern worth noting.
• Do not go deep into topics like genetics or evolution for SSC MTS - these rarely appear. Focus on human body, diseases, vitamins, and basic plant biology for maximum return on time invested.