Fossil evidence bridges the evolutionary lineage of primates.
The most ape-like ancestral primate was Dryopithecus.
(A) Dryopithecus - Correct: This Miocene-era fossil (15-20 mya) shows fully arboreal, ape-like features.
(B) Ramapithecus - Incorrect: Now considered a synonym of Sivapithecus, more closely related to orangutans.
(C) Australopithecus - Incorrect: These were early hominins with bipedal adaptations.
(D) Neanderthal man - Incorrect: A late Homo species with advanced tool use and culture.
The correct answer is (A) Dryopithecus, representing the ancestral ape morphology before hominin divergence.
Dryopithecus is considered to be one of the most ape-like ancestors of modern humans. It lived about 12-8 million years ago and showed characteristics that were intermediate between modern apes and early hominids. Ramapithecus and Australopithecus were also important in human evolution, but Dryopithecus is considered closer to the common ancestor of humans and apes.
Option (A) is correct because Dryopithecus is the most ape-like ancestral primate.
A block of certain mass is placed on a rough floor. The coefficients of static and kinetic friction between the block and the floor are 0.4 and 0.25 respectively. A constant horizontal force \( F = 20 \, \text{N} \) acts on it so that the velocity of the block varies with time according to the following graph. The mass of the block is nearly (Take \( g = 10 \, \text{m/s}^2 \)):
A wooden block of mass M lies on a rough floor. Another wooden block of the same mass is hanging from the point O through strings as shown in the figure. To achieve equilibrium, the coefficient of static friction between the block on the floor and the floor itself is
The circuit shown in the figure contains two ideal diodes \( D_1 \) and \( D_2 \). If a cell of emf 3V and negligible internal resistance is connected as shown, then the current through \( 70 \, \Omega \) resistance (in amperes) is: