The mean salinity of sea 35 gm per liter. The main cause of this observed salinity is

• Evaporation and rainfall

• Photosynthesis

• Crust erosionand surface run off

• Rivers drainage

2.

Which statment is not correct for all mammals?

• Absence of scales

• Absenceof laying egg

• Absence of segmentation

• Presence of asexual reproduction

Which of the following is the major environmental cue for migration of birds during winter?

• Duration of day length

• Instinct

• Falling temperature

• Learning

‘Imperfect fungi’ is a group represented by fungal species which have

• Simple mycelia

• No known mechanism of sexual reproduction

• Unknown phylogenetic relationship

• Lost its survival mechanism against harsh environments

Among the following which is typical tree of Indian desert ecosystem?

• Prospis cineraria     

• Avicennia officinalis   

• Mangifera india  

• Acer negundo     

Which of the following is not an invasive plant species in India?

• Parthenium hysterophorus  

• Salvinia molesta    

• Lantana camara 

• Myristica fica  

The casual organism for blast of rice is:

• Pyricularia grisea  

• Ustilago tritici 

• Erwinia chrysanthemi

• Cercospora janeseanna  

Nilgiri Tahr is restricted only to upper heights (1,200 to 2,600 meters) of Western Ghat. The major reason is

• Habitat preferences

• Habitat shrinkage  

• Urbanization in other parts of habitat 

• Pressure of tiger predation at lower height 

On exposure to desiccation which of the following bacteria are least likely to experience rapid water loss?

• Isolated rods  

• Rods in chain

• Cocci in chain

• Cocci in clusters

Horse shoe crabs belong to the group

• Onychophora

• Chelocerata   

• Uniramia

• Crustacea