The process of sperm fusing with an egg to form a zygote is: MCQ with Answer and Explanation

Explanation:
When both parents are heterozygous (Tt × Tt), the offspring genotypes are TT (25%), Tt (50%), and tt (25%). Since tall (T) is dominant over dwarf (t), both TT and Tt are tall, resulting in 3 tall : 1 dwarf phenotypic ratio. The genotypic ratio is 1:2:1. 9:3:3:1 is the dihybrid phenotypic ratio. 1:1 ratio is seen in test cross (Tt × tt).

Explanation:
Tetanus (lockjaw) is caused by the neurotoxin of Clostridium tetani, a soil bacterium that enters through wounds. The toxin causes muscle spasms and rigidity. Diphtheria is by Corynebacterium diphtheriae, pertussis by Bordetella pertussis, botulism by Clostridium botulinum (also a neurotoxin, but from food poisoning). Vaccination with DPT/tetanus toxoid prevents tetanus.

Explanation:
Chloroplasts are present only in the green, photosynthetic parts of plants, not in root cells or non-green tissues. Plant cells typically have a single, large central vacuole occupying most of the volume, whereas animal cells have small, temporary vacuoles. Centrioles are absent in higher plants (angiosperms and gymnosperms) but present in animal cells and some lower plants. Only statement 2 is correct.