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In Hatch and Slack type plants CO₂ acceptor is

• malate

• pyruvate

• phosphoenol pyruvate

• aspartate

In CAM plants

• stomata open in day and close at night

• stomata remain open in day and night both

• stomata remain closed in day and night both

• stomata open at night and close in day

Incomplete division of egg during cleavage is known as

• meroblastic

•  holoblastic

• meridional

• spiral

Organ of Corti is found in

• heart

• kidneys

• inner ear

• nasal chamber

Peyer's patches produce

• mucus

• trypsin

• lymphocytes

• enterokinase

A person who is trisomic for twenty first pair of chromosome suffers from

• Klinefelter's syndrome

• Down's syndrome

• Turner's syndrome

• None of the above

In which blood group antigen are absent

• O

• A

• B

• AB

The immediate cause of induction of ovulation in female is the large plasma surge of

• progesterone

• estradiol

• LH

• FSH

The effect of intraspecific competition on niches is to make them

• smaller

• larger

• change location

• more triangular

The larvicidial fish used in biocontrol of mosquitoes

• Gambusia

• Hilsa

• Scatophagus

• Gold fish