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Histogram

What is a histogram, and how is it different from a bar graph? Construct a histogram for the following frequency distribution:

Age (years): 0-10, 11-20, 21-30

Frequency: 5, 8, 12

Probability

If a die is rolled, what is the probability of getting an even number? Explain your reasoning.

Measures of dispersion

Explain the concept of variance and standard deviation. Calculate the standard deviation for the data set: 5, 8, 12, 15, 18.

Measure of central tendency

Calculate the mean, median, and mode for the following data set: 12, 15, 12, 18, 20, 22, 15.

Data Representation

How do you construct a frequency distribution table for a given set of data? Provide an example.

Plant Kingdom

Explain briefly the following terms with suitable examples:-
(i) protonema
(ii) antheridium
(iii) archegonium
(iv) diplontic
(v) sporophyll
(vi) isogamy

Plant Kingdom

What is heterospory? Briefly comment on its significance. Give two
examples.

Plant Kingdom

Both gymnosperms and angiosperms bear seeds, then why are they
classified separately?

Plant Kingdom

Write a note on economic importance of algae and gymnosperms.

Plant Kingdom

Mention the ploidy of the following: protonemal cell of a moss; primary
endosperm nucleus in dicot, leaf cell of a moss; prothallus cell of a ferm;
gemma cell in Marchantia; meristem cell of monocot, ovum of a liverwort,
and zygote of a fern.