The special adaptations of birds all contribute to two factors essential for flight namely, more power and less weight. Explain how each of the following contributes to one of the other or both:
(i) Endothermy
(ii) Respiratory system
(iii) Skeletal system
(iv) Excretory system.
See Answer →What is speciation? Explain the mode of speciation.
See Answer →Dosage compensation
See Answer →What are the three main reptile lines that evolved from the amniotes during the Mesozoic era and from which lineage did the present day reptiles evolve? How would you distinguish among the anapsid, diapsid and synapsid types of skull?
See Answer →Frame shift mutation
See Answer →Explain the mechanism of circulation in amphibians.
See Answer →Genetic drift
See Answer →Chromosome mapping
See Answer →List three groups of adaptations that explain how each contributed to the success of vertebrates.
See Answer →Heterozygous
See Answer →What do you understand by sexual selection? Illustrate your answer with a suitable example.
See Answer →hypoosmotic regulator
See Answer →Industrial melanism is an excellent model to demonstrate the natural selection in action. Analyze the above statement critically.
See Answer →euryhaline
See Answer →What are transposable genetic elements? How they can cause mutations?
See Answer →stenohaline
See Answer →Define mutation. Explain the following types of mutations briefly:
a) Induced mutations
b) Suppressor mutations
See Answer →Describe the common morphological features of hagfishes and lampreys. How do they differ from each other?
See Answer →Which among the following statements are correct?
i) Mitochondria contain 80 S ribosomes.
ii) The mRNA encoded by nuclear genes for the smaller subunit of RuBisCo is translated in the chloroplast.
iii) The inheritance of chloroplast genome is independent of nuclear genome.
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