Questions
Which of the following biomes is incorrectly paired with the description of its climate?
- Savannah - Cool temperature and uniform precipitation during the year
- Tundra - extreme cold, permafrost and brief summer
- Chapparal - mild and wet winters, hot and dry summer
- Tropical - nearly constant temperature and rich varieties present here
- Steppe - temperate biome
Gracilicutes and firmicutes are two types of divisions of
- rotifers
- phoronids
- bacteria
- ciliata
- none of the above
The fuzzy layer lining the coated pits and coated vesicle is composed of
- glycoproteins
- ferritin
- transferrin
- clathrin
- glycolipids
Genophore refers to
- prokaryotic nucleus
- chromosome of the prokaryotes
- genome of the eukaryote
- nucleosome of the eukaryotes
- none of the above
A mutation carried on human mitochondrial DNA is inherited through only the mother. This states that
- egg cells do not contain mitochondrial DNA
- sperm cell mitochondria lacks DNA
- maternal mitochodrial DNA is degraded in zygote
- paternal mitochondrial DNA does not enter the egg
- all the above
Which of the following is not involved in cycling of nitrogen?
- Legumes
- Artemesia
- Rhizobium
- Azolla
- Anabena
Which of the following is a form of selection that operates in most natural populations?
- Disruptive selection
- Stabilising selection
- Kin selection
- Artificial selection
- Sexual selection
Anti-infection vitamin is
- cyanocobalamin
- pantothenic acid
- thiamine
- riboflavin
- retinol
Which of the following phenomenon occurs in a situation where individuals of two previously isolated demes come back into sympatry?
- Truncation selection
- Isolation
- Heterosis
- Character displacement
- Frequency depended selection
Genetic variation cannot occur with an individual through the process of
- genetic drift
- recombination of genes
- gene mobility
- crossing over
- none of the above
Which one of the following organisms is correctly paired with its trophic level?
- Cyanobacteria - producer
- Grasshopper - secondary consumer
- Zooplanktons - producers
- Eagle - detritivore
- Azolla - Primary consumers
A second messenger derived from membrane lipid is
- cyclic AMP
- calmodulin
- inostiol phosphate
- protein kinase
- cyclic GMP
Which of the following is a mismatched pair?
- Neritic zone - shallow area over continental shelf
- Abyssal zone - deepest benthic zone
- Intertidal zone - characterised by presence of plants
- Pelagic zone - area of open water
- Littoral zonre - close to the shore
The main target organs for tropic hormones are
- exocrine glands
- endocrine glands
- blood vessels
- muscles
- mixed glands
The synthetic version of _______________ is used as an effective measure to control insect population.
- ecdysone hormone
- moulting hormone
- juvenile hormone
- prothoracotropic hormone
- none of the above