What is meant by the "species problem"?

(1) The exact definition of species is still controversial.

(2) The exact mechanisms of speciation is not known.

(3) The number of species present is much more than identified species.

(4) The extinction of species is taking place at an alarming rate.

Which of the following taxonomic categories are correctly matched to their standard termination of names with respect to biological classification of plants?

1. I, II, IV

2. I, II, III

3. II, III, IV

4. I, II, III, IV

Consider the following statements:

I. Higher the taxa, more are the characteristics that members whithin the taxon share.

II. Lower the category, greater is the difficulty of determining the relationship to other taxa at the same level.

Of the two statements:

(1) I is true but II is false

(2) I is false but II is true

(3) Both I and II are true

(4) Both I and II are false

The Indian Botanical Garden and the National Botanical Research Institute are located respectively at:

(1) Pune and Howrah

(2) Howrah and Lucknow

(3) Darjeeling and Lucknow

(4) Shimla and Dehradun

Match each item in Column I with one in Column II and choose your answer from the codes given below:

Codes:

As we go lower from kingdom to species, the number of common characters at each taxon:

1. Goes on decreasing

2. Goes on increasing

3. Remains same

4. There is no pattern to this

Which of the following taxonomic categories contains organisms least similar to one another?

1. Class

2. Genus

3. Family

4. Species

The label of a herbarium sheet does not carry information on

(1) date of collection

(2) name of collector

(3) local names

(4) height of the plant

Match column I with column II for housefly classification and select the correct option using the codes given below:

Codes:

         A     B     C     D

(1)     3     1      4     2

(2)     3     2      4     1

(3)     4     3      2     1

(4)     4     2      1     3

Study the four statements (I-IV) given below and select the two correct ones out of them:

I. Definition of biological species was given by Ernst Mayr.

II. Photoperiod does not affect reproduction in plants.

III. Binomial nomenclature system was given by RH Whittaker.

IV. In unicellular organisms, reproduction is synonymous with growth.

The two correct statements are

(1) II and III

(2) III and IV

(3) I and IV

(4) I and II