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.

The evolutionary story of moths in England during industrialization reveals, that "evolution is apparently reversible". Clarify this statement.

Long Answer Questions Five mark Each QUESTIONS FROM CBSE BOARD EXAMINATIONS : A flower of tomato plant following the process of sexual reproduction produces 240 viable seeds. Answer the following questions giving reasons: (a) What is the minimum number of pollen grains that must have been involved in the pollination of its pistil? (b) What would have been the minimum number of ovules present in the ovary? (c) How many megaspore mother cells were involved? (d) What is the minimum number of microspore mother cells involved in the above case? (e) How many male gametes were involved in this case?

What were the two major shortcomings of meneleev's periodic table? How have these been removed in the modern periodic table?

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.

In dealing with motion of projectile in air, we ignore effect of air resistance on motion.This gives trajectory as a parabola as you have studied. What would the trajectory look like if air resistance is included? Sketch such a trajectory and explain why you have drawn it that way.

Represent the following situations in the form of quadratic equations: A train travels a distance of 480 km at a uniform speed. If the speed had been 8km/h less, then it would have taken 3 hours more to cover the same distance. We need to 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.

You have been given two cans with capacities 9 and 5 liters respectively. There is no graduation marks on the cans nor is eye estimation possible. How can you collect 3 litres of water from a tap? ( you are allowed to pour out water from the can). If the cans had capacities 8 and 6 litres respectively, could you collect 5 liters?

A ball of charge q is plaed in a hollow conductive uncharged sphere. After this, the sphere is connected with earth for a short time and the ball is then removed from the sphere. The ball has not been brought into contact with the sphere. What charge will the sphere have after these operations? Where and how will this charge the distributed?

Long Answer Questions Five mark QUESTIONS FROM CBSE BOARD EXAMINATIONS : (a) Asa senior biology student, you have been asked to demonstrate to the students of secondary level in your school, the procedure(s) that shall ensure cross pollination in a hermaphrodite flower. List the different steps that you would suggest and provide reasons for each one of them.