Prepare for NEET Biology Photosynthesis in Higher Plants with MCQs & PYQs on NEET.GUIDE. Get free practice, previous year questions, and expert guidance to grasp light and dark reactions.
Which type of light converts the inactive form of phytochrome to its active form?
red light
far-red light
blue light
green light
Phytochrome plays a crucial role in:
photoperiodism
photosynthesis
respiration
transpiration
The Emerson enhancement effect and the Red drop phenomenon were crucial in uncovering the existence of:
Chemiosmosis
Two photosystems
Photophosphorylation
Cyclic photophosphorylation
Which experimental observations provided strong evidence for the presence of two distinct photosystems in photosynthesis?
Hill reaction
Blackman's law of limiting factors
Emerson effect and Red drop
Warburg effect
The sharp decline in photosynthetic quantum yield observed at wavelengths above 680 nm, known as the Red drop, suggests:
Chlorophyll a is not the only pigment involved in light absorption.
Photosynthesis ceases completely at wavelengths above 680 nm.
Chlorophyll a becomes inactive at wavelengths above 680 nm.
Far-red light is not utilized in photosynthesis.
If only chlorophyll a were present in plants, which phenomenon would be most prominently observed?
A pronounced Emerson enhancement effect
A pronounced Red drop effect
Increased photolysis of water
Increased photorespiration
In photosynthetic organisms, the Emerson enhancement effect is observed when:
Green light is used
Blue light is used
Red light is used alone
Red and far-red light are used simultaneously
The oxygen released during photosynthesis originates from which molecule, and which two elements are directly involved in this process?
Carbon and Oxygen
Hydrogen and Carbon
Hydrogen and Oxygen
Manganese and Chlorine
During the light-dependent reactions of photosynthesis, water molecules are split. Which two elements are liberated from water in this process?
Carbon and Oxygen
Hydrogen and Oxygen
Magnesium and Oxygen
Phosphorus and Oxygen
In photosynthesis, oxygen is produced from the splitting of:
Carbon dioxide molecules
Water molecules
Glucose molecules
ATP molecules
