Life Processes

Which type of respiration occurs in human muscles during vigorous exercise?

1. Aerobic respiration
2. Anaerobic respiration
3. Photosynthesis
4. Transpiration

Which chamber of the heart pumps oxygenated blood to the entire body?

1. Right atrium
2. Right ventricle
3. Left atrium
4. Left ventricle

Which process removes nitrogenous wastes from the human body?

1. Respiration
2. Digestion
3. Excretion
4. Circulation

Which of the following is an autotrophic mode of nutrition?

1. Humans eating food
2. Fungi absorbing nutrients
3. Green plants making their own food
4. Animals feeding on plants

Which enzyme is present in saliva and helps digest starch?

1. Pepsin
2. Trypsin
3. Amylase
4. Lipase

Which part of the nephron performs filtration of blood?

1. Tubule
2. Glomerulus
3. Collecting duct
4. Ureter

Which vessel carries oxygen-rich blood from the lungs to the heart?

1. Pulmonary artery
2. Pulmonary vein
3. Aorta
4. Vena cava

What is the main function of the human respiratory system?

1. Transporting nutrients
2. Exchange of gases
3. Removing solid waste
4. Producing hormones

Which component of blood helps in clotting?

1. Red blood cells
2. White blood cells
3. Platelets
4. Plasma

Which part of the human digestive system produces hydrochloric acid?

1. Mouth
2. Stomach
3. Small intestine
4. Large intestine

Which pigment helps plants absorb sunlight for photosynthesis?

1. Haemoglobin
2. Chlorophyll
3. Melanin
4. Carotene

Which organ is responsible for the absorption of digested food in humans?

1. Stomach
2. Small intestine
3. Large intestine
4. Liver

Which of the following processes is responsible for obtaining energy from food in living organisms?

1. Respiration
2. Transportation
3. Excretion
4. Reproduction

Why is transportation of substances necessary in multicellular organisms?

1. Cells can obtain everything directly from the environment
2. Large organisms require specialized systems to distribute materials efficiently
3. It is needed only for plants
4. It prevents respiration

Why is the double circulation system in humans considered efficient?

1. Blood passes through the heart once in each cycle
2. It prevents mixing of oxygenated and deoxygenated blood
3. It reduces oxygen supply to tissues
4. It eliminates the need for lungs

What is the role of stomata in plants?

1. Absorb minerals
2. Transport food
3. Exchange gases and regulate water loss
4. Produce seeds

Which blood vessel carries oxygenated blood from the lungs to the heart?

1. Pulmonary artery
2. Aorta
3. Vena cava
4. Pulmonary vein

Which organ filters waste products from the blood?

1. Heart
2. Liver
3. Kidney
4. Lung

Which process releases energy from food in living cells?

1. Photosynthesis
2. Respiration
3. Digestion
4. Excretion

What is the primary function of red blood cells?

1. Fight infections
2. Carry oxygen
3. Digest food
4. Produce hormones

Which part of the human digestive system absorbs digested food?

1. Stomach
2. Mouth
3. Small intestine
4. Esophagus

Which pigment is necessary for photosynthesis?

1. Hemoglobin
2. Chlorophyll
3. Melanin
4. Keratin

Which process is responsible for preparing food in green plants?

1. Respiration
2. Photosynthesis
3. Excretion
4. Transpiration