The technique used to measure the rate of photosynthesis by counting oxygen bubbles is: MCQ with Answer and Explanation

Explanation:
Parkinson's disease is a neurodegenerative disorder characterized by the loss of dopamine-producing neurons in the substantia nigra region of the brain. This leads to motor symptoms like tremors, rigidity, and bradykinesia. L-DOPA (levodopa), a precursor of dopamine, is used in treatment. Acetylcholine is related to Alzheimer's, serotonin to depression.

Explanation:
All chordates, at some point during their larval or adult stages, possess three key features: a dorsal hollow nerve cord, a notochord (a flexible rod supporting the body), and pharyngeal slits. The notochord may be replaced by a vertebral column in vertebrates. Arthropods have a ventral nerve cord and open circulatory system.

Explanation:
Zinc is an essential micronutrient for plants, involved in the synthesis of the auxin indole-3-acetic acid (IAA) via the activation of tryptophan synthetase. Zinc deficiency causes 'little leaf' and 'rosette' diseases, stunted growth, and reduced internodes. Iron is needed for chlorophyll synthesis, manganese for photosynthesis, and boron for pollen germination.