Fresh tomatoes are a better souree of vitamin C than those present in tomatoes which have been stored for some time.

Consider the following four statements (A-D) and select the option which includes all the correct ones only: Single cell Spirullina can produce large quantities of food rich in proteins, minerlas, vitamins, etc. Body weightwise, the micro-organism Methylophilus methylotrophus may be able to produce several time more proteins than the cows per day Common button mushrooms are a very rich source of vitamin-C A rice variety has been developed which is very rich in calcium.

Samples of four metals A,B,C and D were taken and added to the following solution one by one. The results obtained have been tabulated as follows. Use the table above to answer the question about metals A, B, C and D: Which is the most reactive metal ?

A few normal seedlings of tomato were kept in a dark room. After a few days they were found to have become show coloured like albions. Which of the following terms will you use to describe them?

Write True or False: By this time ,more than 100 different gibberellins have been identified.

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?

A fully charged capacitor C with intial charge q_0 the connected to a coil of self-indcutance L at t = 0. The time at which, the energy is stored equally between the electric and magnetic field is

Given below are a few statements related to external fertilization. Choose the correct statements. The male and female gametes are formed and released simultaneously Only a few gametes are released into the medium. Water is the medium in a majority of organisms exhibiting external fertilization. Offspring formed as a result of external fertilization have better chance of survived than those formed inside an organism.

A lamp having a resistance of 25 ohm is not allowed to pass current more than 5 A. Find the value of the inductance, which must be used in series with the lamp, which is supplid by an a.c. of maximum r.m.s. 325 V at 50 Hz.