Study the four statements (A – D) given below and select the two correct ones out of them:
A. Definition of biological species was given by Ernst Mayr.
B. Photoperiod does not affect reproduction in plants.
C. Binomial nomenclature system was given by R. H. Whittaker.
D. In unicellular organisms, reproduction is synonymous with growth.
The two correct statements are
1. A and B
2. B and C
3. C and D
4. A and D

Which among the following are the smallest living cells known without a definite cell wall that are pathogenic to plants as well as animals and can survive without oxygen?
1. Bacillus
2. Pseudomonas
3. Mycoplasma
4. Nostoc

Which of the following are found in extreme saline conditions?
1. Archaebacteria
2. Eubacteria
3. Cyanobacteria
4. Mycobacteria

Viroids differ from viruses in having
1. DNA molecules with protein coat
2. DNA molecules without protein coat
3. RNA molecules with protein coat
4. RNA molecules without protein coat

Which of the following features is common to prokaryotes and many eukaryotes?

1. Chromosomes present

2. Cell wall present

3. Nuclear membrane present

4. Sub cellular organelles present

All eukaryotic unicellular organisms belong to
1. Monera
2. Protista
3. Fungi
4. Bacteria

The five kingdom classification was proposed by

Organisms living in salty are called as
1. Methanogens
2. Halophiles
3. Heliophytes
4. Thermoacidophiles

Naked cytoplasm, multinucleated and saprophytic are the characteristics of

An association between roots of higher plants and fungi is called
1. Lichen
2. Fern
3. Mycorrhiza
4. BGA