Study the figure given below and answer the questions that follow.
Highly conserved proteins such as Haemoglobin and Cytochrome-C provide the best biochemical evidence to trace evolutionary relationships between different groups. Cytochrome-C is formed of 104 amino acids. Cytochrome-C is the respiratory pigment present in all eukaryotic cells. It has evolved at a constant rate during evolution. In chimpanzees and humans, Cytochrome-C genes are identical. The given data shows the evolution of the Cytochrome-C gene in different mammals from kangaroos, cows, rodents to humans:
Groups | Nucleotide substitution in the gene of Cytochrome-C | Millions of years ago |
---|---|---|
Human/Kangaroo | 100 | 125 mya |
Human/Cow | 75 | 120 mya |
Human/Rodent | 60 | 75 mya |
(a) Select the correct option for the time of separation of two groups and the number of nucleotide substitutions in the gene of Cytochrome-C:
Options | Time of separation of two groups during evolution | Number of nucleotide substitutions |
---|---|---|
(i) | Lesser | Greater |
(ii) | Greater | Lesser |
(iii) | Greater | Greater |
(b) What do you infer about the type of evolution (convergent or divergent) for the given pair of groups and why?
(i) Human and Kangaroo
(ii) Human and Rodent
(c)
(i) Define convergent evolution.
OR
(ii) Define divergent evolution.
A carpenter needs to make a wooden cuboidal box, closed from all sides, which has a square base and fixed volume. Since he is short of the paint required to paint the box on completion, he wants the surface area to be minimum.
On the basis of the above information, answer the following questions :
Find \( \frac{dS}{dx} \).
मालवा में ऋतु परिवर्तन के प्रभाव स्वरूप पहले कौन-से बदलाव होते थे ? वर्तमान में उसमें क्या अंतर आया है ? इस अंतर के कारणों की पड़ताल कीजिए ।
ग्रामीण परिवेश में जन्मे, पले-बढ़े व्यक्ति का आगे का जीवन भले ही शहर में बीते पर उसकी स्मृतियों का गाँव सदैव मोहक और आकर्षक बना रहता है । – ‘बिस्कोहर की माटी’ पाठ के आधार पर सोदाहरण लिखिए ।