Which one of the following is most appropriately defined?

• Host is an organism, which provides food to another organism

• Amensalism is a relationship in which one species is benefited whereas the other is unaffected

• Predator is an organism that catches and kills other organism for food

• Predator is an organism that catches and kills other organism for food

The figure given below is a diagrammatic representation of the response of organisms to abiotic factors. What do A, B, and C represent respectively?

• A	B	C
  Conformer	Regulator	Partial regulator

• A	B	C
  Regulator	Partial regulator	Conformer

• A	B	C
  Partial regulator	regulator	conformer

• A	B	C
  Partial regulator	regulator	conformer

Which one of the following statemtents about morula in human is correct?

• It has almost equal quantity of cytoplasm as an uncleaved zygote but much more DNA

• It has far less cytoplasm as well as less DNA than in an uncleaved zygote

• It has more or less equal quantity of cytoplasm and DNA as in uncleaved zygote

• It has more or less equal quantity of cytoplasm and DNA as in uncleaved zygote

A country with a high rate of population growth took measures to reduce it. The figure below shows age-sex pyramids of populations. A and B twenty years apart. Select the correct interpretation about them

Interpretations

• 'A' is more recent and shows slight reduction in the growth rate

• 'B' is earlier pyramid and shows stabilised

• 'B' is more recent showing that population is very young

• 'B' is more recent showing that population is very young

Some hyperthermophilic organisms that grow in highly acidic (pH2) habitats belongs to the two groups called

• eubacteria and archaea

• cyanobacteria and diatoms

• protists and mosses

• protists and mosses