Question

Plzz give me Class 9th Ncert Science chapter 5 page no.78,Question no.11 and 15 solution​

Answer 1

Genetic variation is essential for natural selection because natural selection can only increase or decrease frequency of alleles that already exist in the population. Genetic variation is caused by: mutation. random mating between organisms

Answer 2

11. Skin : epithelial tissue ( squamous epithelial)

Bark of tree : protective tissue

Bone : skeletal tissue ( connective tissue)

Lining of kidney tubules : cuboidal epithelial tissue

Vascular bundle : complex permanent tissue - xylem nd pholem.