Dr F went noted that if coleoptile tips were removed and placed on agar for one hour, the agar would produce a bending when placed on one side of freshly cut coleoptile stumps. Of what significance is this experiment?

• It made possible the isolation and exact identification of auxin

• It is the basis for quantitative determination of small amounts of growth - promoting substances

• It supports the hypothesis that IAA is auxin

• It supports the hypothesis that IAA is auxin

Which of the following are most suitable indicators of SO₂ pollution in the environment?

• Lichens

• Conifers

• Algae

• Algae

The most abundant prokaryotes helpful to humans in making curd from milk and in production of antibiotics are the ones categorised as

• Cyanobacteria

• Archaebactera

• Chemosynthetic autotrophs

• Chemosynthetic autotrophs

Viruses have

• DNA enclosed in a protein coat

• prokaryotic nucleus

• single chromosome

• single chromosome

The first human hormone produced by recombinant 

• insulin

• estrogen

• thyroxin

• thyroxin

The highest number of species in the world is represented by

• fungi

• mosses

• algae

• algae

77.

Which statement is wrong for viruses?

• All are parasites

• All of them have helical symmetry

• They have ability to synthesize nucleic acids and proteins

• They have ability to synthesize nucleic acids and proteins

Which one of the following is common to multicellular fungi, filamentous algae and protonema of mosses?

• Diplontic life style

• Members of kingdom-Plantae

• Mode of nutrition

• Mode of nutrition

Maximum nutritional diversity is found in the group 

• Fungi

• Animalia

• Monera

• Monera

How many organisms in the list given below are autotrophs?
Lactobacillus, Nostoc, Chara, Nitrosomonas, Nitrobacter, Streptomyces, Sacharomyces, Trypanosoma, Porphyra, Walfia.

• Four

• Five

• Six

• Six