General Science Class 9 MCQS

As temperature increases, initially the rate of reaction will :

1. Decrease
2. Remain constant
3. Fluctuate
4. Increase

Enzyme changes in pH can cause enzymes to :

1. Denature
2. Activate
3. Inhibit
4. Stabilize

In the human body there are more than _____ known enzymes.

1. 800
2. 1000
3. 1200
4. 1500

The only source of energy on earth is :

1. Moon
2. Star
3. Water
4. Sun

Conversion of free energy into different forms by living organisms is called?

1. Biophysics
2. Biomechanics
3. Bioenergetics
4. Biochemistry

In living organisms energy is stored in a special molecule called?

1. ATP
2. NADH
3. RNA
4. DNA

Plant utilizes simple inorganic molecules (CO2 and H2O) to prepare :

1. Glucose and water
2. Glucose and oxygen
3. Oxygen and water
4. Oxygen and Glucose

Feeding sequences and relationships are called?

1. Food webs
2. Ecosystem
3. Food chains
4. Habitats

Photosynthesis is the only process which produces free O2 by splitting :

1. Glucose
2. Carbon Dioxide
3. Chlorophyll
4. Water

In chloroplast different pigments absorb light of different :

1. Intensity
2. Wavelength
3. Frequency
4. Amplitude