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Which of the following is the energy currency of the cell?

• DNA

• RNA

• ATP

• ADP

The opening and closing of stomata are controlled by:

• Chloroplasts

• Guard cells

• Phloem

• Xylem

In humans, the digestion of protein starts in the:

• Mouth

• Stomach

• Small intestine

• Large intestine

The functional unit of the kidney is:

• Neuron

• Nephron

• Alveoli

• Villus

Which enzyme breaks down starch into sugars?

• Lipase

• Amylase

• Pepsin

• Trypsin

Blood is purified in which organ?

• Lungs

• Heart

• Liver

• Kidneys

The site of photosynthesis in plants is:

• Mitochondria

• Chloroplast

• Vacuole

• Nucleus

Which gas is released during photosynthesis?

• Carbon dioxide

• Oxygen

• Nitrogen

• Hydrogen

In humans, bile is produced by which organ?

• Pancreas

• Liver

• Stomach

• Small intestine

The blood vessel that carries oxygenated blood is:

• Vein

• Artery

• Capillary

• Lymph