21.

Which one of the following statement is not true about vitamins?

• They were named by Funk

• They are vital for life

• Their deficiency causes disease

• They help in digestion

Which statement is true?

• In plant water and minerals are transported by phloem

• During photosynthesis, oxygen is released from CO₂

• Ultimate source of energy for all the organisms is Sun

• The leaves of Touch-Me-Not (Mimosa pudica) plant exhibit seismonastic movement

Energy equivalent to 1 amu is

• 0.693 MeV

• 1 eV

• 931 MeV

• 14.2 MeV

After vigorous exercise fatigue is caused due to accumulation of which substance?

• Carbon dioxide

• Alcohol

• Lactic acid

• Water

Insulin hormone converts

• glycogen into glucose

• glucose into glycogen

• fat into glucose

• protein into glucose

Which one of the following is not a characteristic of thermal radiation?

• It does not require medium for its propagation

• It travels with velocity of light

• It travels in straight line

• It affects the medium through which it propagates

Which one of the following elements is a donor impurity?

• Al

• B

• Ga

• P

Which alloy is not possible?

• Cu- Zn

• Pb- Zn

• Cu- Au

• Cu- Ag

While introducing Newton's law of motion a teacher writes all the formulas on the board before proceeding further. This reflects that she is following the

• experimental approach

• practical approach

• inductive approach

• deductive approach

Vitamin containing metal atom is

• Vitamin- C

• Vitamin-B₁₂

• Vitamin-B

• Vitamin -A