Identify the features of homologous organs-
(a) Different by structure but identical by origin and function
(b) Different by origin and function but identical by structure
(c) Different by origin but identical by structure and function
(d) Identical by origin and structure but different by function
(d) Identical by origin and structure but different by function
Explanation
Homologous organs are similar in basic structure and embryonic origin but perform different functions in different species. For example, the forelimbs of a human, wing of a bat, and flipper of a whale have the same underlying bone structure and origin, yet they serve different purposes like grasping, flying, and swimming respectively.
More WBBSE Moderate level questions
Which theory can be reached from the comparative study of the embryos of different vertebrate animals?
Which reactants were used in the experiment of Miller and Urey regarding the chemical origin of life? (a) Oxygen, Methane, Nitrogen dioxide (b) Water, Methane, Ammonia, Hydrogen (c) Methane, Hydrogen sulphide, Carbon monoxide (d) Nitrous oxide, Methane, Carbon dioxide
Explain the theory of Darwin with regard to the lengthening of the neck of a giraffe. What do you mean by 'Hot Dilute Soup'? [3+2=5] OR Construct the sequence of major events of organic evolution with the help of a schematic diagram. Give two examples of the problem-solving ability of chimpanzees. [3+2=5]
What do you mean by natural selection?
Match the words in column-A with the most appropriate words in column B and re-write the correct pair mentioning the serial no. of both columns COLUMN - A COLUMN - B 1. Meninges (a) Decrease in the number of digits in the legs 2. Sexual reproduction (b) Submergence of islands 3. Roller tongue (c) Centromere 4. Evolution of the horse (d) Telomere 5. Environmental problem of Sundarban (e) Protects brain and spinal cord from mechanical injury 6. Attaches chromosome with spindle fibre (f) Controlled by autosome (g) Occurs through the production of gametes and their union
Which of the following is an inference of Darwin's theory of evolution? (a) Natural Selection (b) Variation (c) Prodigality of reproduction (d) Food and Space is constant
Which of the following is not a tenet of Darwinism? (a) Struggle for existence (b) Variation (c) Natural selection (d) Inheritance of acquired character
Equus possessed 4 digits in the forelimb and three digits in the hindlimb
What information related to evolution can be obtained from the discussion on comparative structure of hearts of different vertebrate groups ? Explain the following two terms in the light of Darwinism - (a) Survival of the fittest (b) Natural selection OR Explain the evolutionary significance of homologous and analogous organs with the help of example. What are the adaptive significances of air sacs of Pigeon ? [3+2=5]
Prepare a list of reactants used and products in the experiment of Miller and Urey regarding biochemical origin of life.
Match the words in Column A with the most appropriate words in Column B and rewrite the correct pair mentioning the serial no. of both columns (any five): [1×5=5] Column A Column B 2.13 Adrenaline (a) Air Pollutant 2.14 Self pollination (b)According to Haldane the hot marine water containing different organic compounds 2.15 The position of flower is axial (c)The adoloscent phase of human development 2.16 Hot Dilute Soup (d)No need of agent 2.17 SPM (e)The senescence phase of human development. 2.18 Britleness of bone and pain at bone joints (f) Increases heart beat, cardiac output and blood pressure. (g) Dominant trait
Which one of the following is the best example of convergent evolution and similarity due to it? (a) Wing structure of bat and bird (b) Trunk of elephant and body of whale (c) Chameleon and shark (d) Light organs and changes in arrangement of eyes—Anglerfish
