Consider statements about environment: 1. Acid rain damages buildings and monuments. 2. Ozone depletion increases UV radiation. 3. Global warming is caused by a decrease in greenhouse gases. Which are correct? MCQ with Answer and Explanation

Explanation:
Phosphorus is a primary macronutrient (along with nitrogen and potassium) required in relatively large amounts for nucleic acids, ATP, and phospholipids. Iron, zinc, and copper are micronutrients needed in trace amounts. Macronutrients include C, H, O, N, P, K, Ca, Mg, S. Micronutrients function as enzyme cofactors.

Explanation:
The cell membrane (plasma membrane) is primarily composed of a phospholipid bilayer with embedded proteins, following the fluid mosaic model. The cytoskeleton is a network of protein filaments (microtubules, microfilaments, intermediate filaments) that provides structural support, shape, and facilitates intracellular transport. Ribosomes are the site of protein synthesis, not lipid synthesis (which occurs in the smooth ER). Thus, statements 1 and 3 are correct.

Explanation:
Cholera, caused by Vibrio cholerae, is transmitted through contaminated water and food. Malaria is vector-borne, TB airborne, rabies through animal bite.