(a) | Seed ferns are common ancestors for Gnetales and cycads. |
(b) | Zosterophyllum are avascular land plants that evolved in the Silurian period. |
(c) | Lycopods are the oldest extant vascular land plants. |
(d) | Sphenopsids evolved from the group of plants to which Psilophyton belongs. |
Statement A: | Similarities in proteins and genes among diverse organisms indicates common ancestry. |
Statement B: | Humans and chimpanzees also show biochemical similarities. |
1. | Pre-existing advantageous mutations when selected will result in observation of new phenotypes |
2. | Exposure to antibiotics causes mutation that confer antibiotic resistance |
3. | Mutations are directional variations |
4. | All antibiotic resistant bacteria which exist today are result of artificial selection |
Assertion (A): | Big bang theory says that the universe is still expanding. |
Reason (R): | The expansion of the universe caused the decrease in temperature. |
1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are true, but (R) is not the correct explanation of (A). |
3. | (A) is true, but (R) is false. |
4. | (A) is false, but (R) is true. |
Assertion (A): | According to Darwin, fitness means reproductive fitness. |
Reason (R): | Those who are a better fit in the environment will leave more progenies. |
1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are true, but (R) is not the correct explanation of (A). |
3. | (A) is true, but (R) is false. |
4. | (A) is false, but (R) is true. |