Experiment 18 — Run a Dairy

Topic: Biology · Class 9 · Improvement in food resources: animal husbandry

Aim: Raise milk yield to at least 3,000 litres per cow a year, while keeping the animals healthy.

Daily: Operation Flood made India the world’s largest milk producer, built on exactly these choices: better breeds, balanced feed, clean sheds and regular veterinary care.

Question: Why are Indian cattle breeds crossed with exotic ones?

Exp: Cross-breeding aims to capture the best traits of both.

Question: A balanced cattle ration contains…

Exp: Fibre for bulk, concentrates for protein and energy.

Question: Sahiwal and Red Sindhi are…

Exp: Known for heat tolerance and disease resistance.

Question: Broilers are poultry raised for…

Exp: Layers are raised for eggs.

Question: Regular deworming matters because parasites…

Exp: Prevention is cheaper than treatment.

Question: The slope of a velocity–time graph gives…

Exp: The area under it gives distance.

Question: A car doubles its speed. Braking distance becomes…

Question: A net force of 10 N on a 4 kg body gives an acceleration of…

Question: A 3 kg ball fired at 20 m/s from a 60 kg cannon gives a recoil of…

Exp: 60 kg m/s ÷ 60 kg = 1 m/s.

Question: In a vacuum, a coin and a feather dropped together…

Exp: All bodies fall with the same g.

Question: Apparent loss of weight in water equals…

Question: A cart released from 5 m on a frictionless track can climb at most…

Exp: Energy is conserved, so it cannot rise higher than it started.

Question: An echo in sea water returns in 2 s. With v = 1500 m/s, the depth is…

Question: While ice melts, the temperature…

Exp: The heat supplied is latent heat of fusion.

Question: A light beam is visible passing through…

Question: In paper chromatography, the spot must be placed…

Exp: Otherwise the dyes wash off.