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Which of the following is not a characteristic of desert ecosystem ?
A) Annual rainfall less than 25 cm

B) Profuse root system with adventitious branches

C) Very low biodiversity

D) Organic matter content in the soil is very high

Unit membrane of cells is a membrane.
A) Single layered B) Double layered C) Triple layered D) Multilayered

Photolysis of water during photosynthesis needs the presence of

A) Mn2+ and Cl- 8) Mg?* and Cl-

C) Mn?* only D) Cr only

The year in which the Convention on Biodiversity came into force is

A) 1992 B) 1993 C) 1994 D) 1995
Inflorescence of Ocimum is

A) Verticillaster B) Thyrsus C) Coenanthium D) Cyathium
Enzyme responsible for the unwinding of DNA double helix is

A) DNA helicase B) DNA gyrase

C) Both A andB D) None of the above

Characteristic aestivation of the family Fabaceae is
A) Valvate B) Imbricate C) Quincuncial D) Vexillary

Which one among the following is an example for exotic plant species of India ?
A) Parthenium hysterophorus B) Lantana camera
C) Ejichhorina crassipes D) All of the above

Assimilatory power generated during the light reaction of photosynthesis is
A) NADPH, and ATP B) NADH, and ATP
C) ATP only D) None of the above

Pachytene of Prophase | is characterized by

A) Chromosome becomes more thicker and shorter

B) Number of observable chromosomes is half of the somatic number

C) Crossing over
)

D) All of the above