QQuestion
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]
✓Answer
Theory of Darwin on Giraffe’s Neck Lengthening:
Darwin proposed that giraffes with longer necks had an advantage because they could reach higher leaves for food. These giraffes were more likely to survive and reproduce, passing the long-neck trait to the next generation. Over many generations, giraffes evolved longer necks due to natural selection favoring this trait.
Meaning of ‘Hot Dilute Soup’:
‘Hot Dilute Soup’ refers to the early Earth’s conditions where organic molecules, the building blocks of life, formed in a warm, watery environment. This metaphor highlights the primordial chemical environment rich in organic compounds where life could originate and evolve.
Major events of organic evolution
Problem Solving in Chimpanzees:
- This animal is quite clever and can prepare a tool with a small branch of a tree. After defoliating the tip of the twig, it is crushed to prepare it like a brush. Then the brush is inserted into the termite mound. This stick like brush is then pulled out when quite a good number of termites may be collected for eating.
- The chimpanzee can also break and open nuts with stones which resemble the “hammer and anvil” technique to get the edible seed.
Related Questions
More WBBSE Moderate level questions
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
What do you mean by natural selection?
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
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
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]
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Write three inferences deduced from the observations as mentioned in Darwin’s theory of origin of new species by natural selection with the help of a table. Explain the problem-solving ability of Chimpanzee regarding procurement of food. [3 + 2]
Show the major events of evolution with the help of a chart. What are the roles of air sacs in the flight of pigeon? [3 + 2]
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Prepare a list of reactants used and products in the experiment of Miller and Urey regarding biochemical origin of life.
What types of struggle for existence can be found among the animals of a forest over eating meat of a freshly killed prey?