Had Darwin been aware of Mendel's work would he been able to explain the origin of variations. Discuss.

You have studied the story of Pepper moths in England. Had the industries been removed, what impact would it have on the moth population? Discuss.

Manish sold a mobile phone at a profit 10%. Had it been sold for Rs. 100 more than profit would have been 20%. Find the C.P. of the mobile phone.

Form the pair of linear equations In the following problems and find their solutions (if they exist) by any algebraic method. :- Yash scored 40 marks in a test, getting 3 marks for each right answer and losing 1 mark for each wrong answer. Had 4 marks been awarded for each correct answer and 2 marks been deducted for each incorrect answer, then Yash would have scored 50 marks. How many questions were there in the test ?

Do you think Mendel's laws of inheritance would have been different if the characters that he choose were located on the same chromosome?

Do you think Mendal's laws of inheritance would have been different if the characters that he close were located on the same chrosome.

From the pair of linear equations in the following problems and find their solutions (if they exist) by elimination method : In an examination the ratio of passes to failures was 4:1. Had 30 less appeared and 20 less passed, the ratio of passes to failures would have been 5:1. How many students appeared for the examination ?

A train travels 360 km at a uniform speed. If the speed had been 5 km/h more, it would have taken 1 hour less for the same journey. Find the speed of the train.

In a class test, the sum of Shefali's marksin Mathematics and English is 30. Had she got 2 marks more in Mathematics and 3 marks less in English, the product of their marks would have been'210. Find her marks in the two subjects.

Check what the result would have been if Sundarm had chosen the numbers shown below. 21