General Agriculture & Social Sciences

The sky appears blue due to Rayleigh scattering of sunlight by gas molecules ($N_2, O_2$) in the Earth's atmosphere. According to Rayleigh's law of scattering, the intensity of scattered light is inversely proportional to the fourth power of its wavelength ($I \propto 1/\lambda^4$). Shorter blue wavelengths (approx. 400-450 nm) are scattered nearly 10 times more effectively than longer red wavelengths, filling the clear sky with diffuse blue light.

Banana is a fast-growing, heavy feeder herbaceous fruit crop that displays extraordinary demand and responsiveness to micronutrients (especially Zinc, Boron, Iron, and Manganese). Deficiencies in Zn or B cause severe bunch deformation and yield depression, which is why banana is widely designated as a 'micronutrient loving crop' requiring regular foliar micronutrient sprays.

In nematode anatomy, the 'nerve ring' (circumesophageal/circumenteric ring) encircles the isthmus of the pharynx and functions as the central coordinating nervous system or 'brain' of the nematode. It gives off anterior cephalic nerves and posterior nerve cords (dorsal, ventral, and lateral cords).

Why other options are incorrect:
Option 1 (Z-organ): A muscular structure in the female reproductive tract of certain dorylaimid nematodes.
Option 2 (Guide ring): A cuticular ring guiding the speart/stylet.
Option 3 (Basal ring): Part of the cephalic framework.

'Tweed Wonder' is a well-established commercial variety of French bean (Phaseolus vulgaris) recognized for its genetic resistance to bean anthracnose caused by the fungal pathogen Colletotrichum lindemuthianum.
Contender and Kentucky Wonder are popular high-yielding varieties, but Tweed Wonder is specifically known for anthracnose resistance.