The respiratory pigment in earthworm is: MCQ with Answer and Explanation

Explanation:
The axon is a long process that transmits action potentials from the soma to the target cell (neuron, muscle, or gland). Dendrites receive signals, soma is the cell body, synaptic terminals release neurotransmitters.

Explanation:
In angiosperms, the pollen tube must enter the ovule to deliver the male gametes to the embryo sac. The most common and typical pathway is through the micropyle (the small opening at the tip of the integuments), which is called porogamy. In some plants (like Casuarina, Juglans), the pollen tube enters through the chalaza (the base of the nucellus), which is called chalazogamy. Entry through the integuments is called mesogamy. Apogamy is the formation of a sporophyte without fertilization.

Explanation:
Hydroponics is a method of growing plants in a water-based, nutrient-rich solution without soil. Aeroponics uses mist, geoponics is soil-based, tissue culture is in vitro on agar media. Hydroponics enables controlled nutrient delivery.