If decomposers are removed what will happen to the ecosystem?

• Energy cycle is stopped

• Mineral cycle is stopped

• Consumers cannot absorb solar energy

• Rate of decompostion of mineral increases

Which of the following is used as green manure?

• Azolla

• Azadirachta

• Crotolaria juncea

• Hevea brassiliansis

Among plants "pheromones" are secreted by the cells of the following plants for given function

• all plants for growth and development

• Yeast for facilitating mating

• all fungi for sexual reproduction

• Rhizopus for formation of zygospore

The gases that produce green house gases are

• CH₄, CFCs, CO₂

• CO₂, N₂O, H₂

• CFCs, NO₂, O₂

• CO₂, N₂, water vapour

75.

What's the difference between RNA and DNA?

• Base

• Sugar

• Sugar and base

• Phosphate

Increase in toxic concentration from one trophic level to another trophic level is called

• ecological toxification

• bio- magnification

• bioconcentration

• cytological effect

Which of the following workers are related as ecologist, palaeobotanist and embryologist respectively?

• B. Salmi, R. Mishra, P. Maheshwari

• R Mishra, B. Sahni, P. Maheshwari

• B. Sahni, P. Maheshwari, R Mishra

• P. Maheshwari, R Mishra, B. Sahni

The Triticale is an intergeneric hybrid between

• wheat and maize

• maize and rye

• wheat and rye

• bajra and wheat

For the formation of tetrasporic embryosac, how many megaspore mother cells are required?

• 1

• 2

• 3

• 4

DNA replication generally proceeds in a 

• 5 $\to$3 direction

• 3 $\to$5 direction

• 3 $\to$3 direction

• 5 $\to$5 direction