Air is to be moved up through a grain bed at the rate of against... | Agrigyan

In farmstead planning and poultry housing design:

• Statement (I) is false: Open-sided cage houses (battery cages) are predominantly built in warm, tropical, and sub-tropical regions (like India) to maximize natural cross-ventilation and prevent heat stress. In very cold regions, poultry require well-insulated, climate-controlled, closed deep-litter housing rather than drafty open cage systems.
• Statement (II) is true: Poultry cages are fabricated from durable galvanized welded wire mesh with a sloped floor (typically a 1:6 to 1:8 slope) extending forward into an egg collection cradle, allowing newly laid eggs to roll safely out of the bird's reach.

Freeze Drying (Lyophilization) preserves food through a two-step mechanism:

• The product is rapidly frozen to convert free water into ice crystals.
• In a high-vacuum drying chamber operating below the triple point of water (611.7 Pa), gentle heat is applied so that ice transforms directly into water vapor without passing through the intermediate liquid phase. This physical phase change is called Sublimation.

In dairy cattle housing and farmstead engineering:
Pen Barns consist of individual or small-group enclosed pens designed for specialized animal care and isolation:

• Calf pens (B) for newborn calf feeding and rearing.
• Maternity / Calving pens (C) to provide clean, quiet, sanitary conditions during parturition.
• Isolation / Quarantine pens (D) for housing sick or injured animals to prevent disease transmission.

In contrast, lactating cows are milked in a dedicated Milking Parlour (A) or stanchion milking barn, not in general pen barns.