A
Reproduction is considered a life process necessary for individual survival
False
Reproduction is important for species survival, not the survival of an individual
Photosynthesis occurs in all parts of a plant.
False
Reason: Photosynthesis occurs mainly in the green parts of a plant, especially in leaves that contain chlorophyll.
Veins and arteries perform the same function.
False
Reason: Arteries carry blood away from the heart; veins carry blood toward the heart.
Pepsin is a protein-digesting enzyme in the stomach
True
Reason: Pepsin breaks down proteins into peptides and functions in the acidic environment of the stomach.
Only autotrophs undergo photosynthesis
True
Reason: Autotrophs, like green plants, make their own food using sunlight, CO₂, and water through photosynthesis.
Respiration and breathing are the same.
False
Reason: Breathing is a physical process of inhaling and exhaling air; respiration is a biochemical process releasing energy from food.
Plants do not respire during the day.
False
Reason: Plants respire all the time; during the day, photosynthesis also occurs, which may mask respiration.
Oxygenated blood is carried by pulmonary arteries.
False
Reason: Pulmonary arteries carry deoxygenated blood from the heart to the lungs.
The kidneys help in digestion of food.
False
Reason: Kidneys are part of the excretory system; they filter waste from the blood, not involved in digestion.
The trachea carries food to the stomach.
False
Reason: The trachea carries air; the esophagus carries food.
Humans have a single circulatory system.
False
Reason: Humans have a double circulatory system—pulmonary and systemic circulation
Peristalsis occurs in the esophagus only.
False
Reason: Peristalsis occurs throughout the alimentary canal.
Excretion in humans is carried out by lungs, skin, and kidneys.
True
Reason: Lungs excrete CO₂, skin excretes sweat, and kidneys filter nitrogenous waste.
Digestion of food begins in the stomach.
False
Reason: Digestion begins in the mouth with salivary enzymes like amylase.
All green plants are autotrophs.
True
Reason: They prepare their own food using sunlight, CO₂, and water through photosynthesis.
Veins have valves to prevent backflow of blood.
True
Reason: Veins carry blood under low pressure and use valves to ensure one-way flow.
Blood is a connective tissue.
True
Reason: Blood connects different body systems by transporting nutrients, gases, etc.
Capillaries have thick muscular walls.
False
Reason: Capillaries have thin walls (one cell thick) to allow exchange of substances.
Hemoglobin binds with carbon dioxide to transport it in blood.
False
Reason: Most CO₂ is transported as bicarbonate ions, though a small amount binds with hemoglobin.
Companion cells assist the function of sieve tube elements in phloem.
True
Reason: Companion cells control the metabolic activity of sieve tubes and help in food transport.
Photosynthesis can occur in red or yellow leaves.
True
Reason: If chlorophyll is present beneath pigments, photosynthesis can still occur.
Plants do not require oxygen.
False
Reason: Plants need oxygen for cellular respiration, especially at night.
Phloem tissue is made up of vessels and tracheids.
False
Reason: Vessels and tracheids are components of xylem. Phloem has sieve tubes, companion cells, etc.
The human stomach secretes bile for digestion.
False
Reason: Bile is produced by the liver and stored in the gallbladder, not secreted by the stomach. The stomach secretes gastric juices like HCl and pepsin.
Saprotrophic nutrition involves preparing food from sunlight.
False
Reason: Saprotrophs feed on dead and decaying matter, not by photosynthesis.