Class 9 Science : Practice Questions and Answers

Condensation is the process in which gas changes into liquid on cooling.

Plasma is an ionized state of matter containing charged particles.

Terrace farming reduces water runoff and prevents soil erosion on slopes.

Vermicomposting uses earthworms to convert organic waste into nutrient-rich compost.

Rohu is a commonly cultivated fish species in pisciculture.

Alfalfa is a nutritious fodder crop rich in protein and commonly fed to livestock.

Drip irrigation is highly effective for grape cultivation because it provides water directly to roots.

Manure improves soil texture, increases microbial activity, and is environmentally friendly.

Compost is an organic manure produced by decomposition of plant and animal waste.

Vitamin D deficiency causes rickets, leading to weak bones and skeletal deformities.

Crossbreeding combines desirable traits from different breeds to improve livestock quality.

Jersey cows are known for high milk production and rich butterfat content.

Rhizobium fixes atmospheric nitrogen and improves soil fertility naturally.

Green manure improves soil fertility by adding organic matter and nutrients.

Drip irrigation supplies water directly to plant roots with minimal wastage.

Mulching helps retain soil moisture and reduce evaporation.

Kharif crops are grown during the rainy season.

Cuboidal epithelium is found in kidney tubules and helps in absorption and secretion.

The epidermis with a waxy cuticle reduces water loss from plants.

Xylem transports water and minerals, while phloem transports food.