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