CTET CTET Science 2 — Questions and Answers
Question 1: Which organ in the human body produces bile to aid in digestion?
- Pancreas
- Liver (Correct answer)
- Gallbladder
- Stomach
Correct answer: Liver
The liver produces bile, which is stored in the gallbladder and released into the small intestine to help digest fats.
Question 2: What type of reproduction involves only one parent and produces genetically identical offspring?
- Sexual reproduction
- Cross-pollination
- Asexual reproduction (Correct answer)
- Fertilization
Correct answer: Asexual reproduction
Asexual reproduction involves a single parent and produces offspring that are genetically identical (clones) to the parent.
Question 3: Which gas is released by plants during photosynthesis?
- Carbon dioxide
- Nitrogen
- Oxygen (Correct answer)
- Hydrogen
Correct answer: Oxygen
Plants release oxygen as a byproduct of photosynthesis when they convert carbon dioxide and water into glucose using sunlight.
Question 4: What is the function of the stomata in plant leaves?
- Absorption of water from soil
- Exchange of gases and transpiration (Correct answer)
- Production of chlorophyll
- Storage of food
Correct answer: Exchange of gases and transpiration
Stomata are tiny pores on plant leaves that allow gas exchange (CO₂ in, O₂ out) and regulate water loss through transpiration.
Question 5: A student observes that iron rusts faster near the seashore than inland. Which factor is most responsible?
- Higher temperature
- Presence of salt in moist air (Correct answer)
- Stronger sunlight
- More oxygen in coastal air
Correct answer: Presence of salt in moist air
Salt (sodium chloride) in the moist coastal air acts as an electrolyte that accelerates the electrochemical process of rusting.
Question 6: Which part of the human eye is responsible for controlling the amount of light entering it?
- Cornea
- Retina
- Iris (Correct answer)
- Lens
Correct answer: Iris
The iris is the colored part of the eye that controls the size of the pupil, thereby regulating how much light enters the eye.
Question 7: What is the process by which water vapor in the atmosphere cools and changes into liquid water droplets?
- Evaporation
- Condensation (Correct answer)
- Sublimation
- Transpiration
Correct answer: Condensation
Condensation is the process in which water vapor cools and converts to liquid water, forming clouds, dew, or rain.
CTET CTET Science 2
Which organ in the human body produces bile to aid in digestion?