Question:

If '+' sign is assigned to beneficial interaction, '-' sign to detrimental and '0' sign to neutral interaction, then the population interaction represented by '+' '-' refers to

Updated On: May 17, 2024

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The Correct Option is D

Parasitism ⇒ Parasite is benefitted (+) but host is harmed (-) so it is a (+, -) type of population interaction.

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	List I		List II
A	Logistic growth	I	Unlimited resource availability condition
B	Exponential growth	II	Limited resource availability condition
C	Expanding age pyramid	III	The percent individuals of pre-reproductive age is largest followed by reproductive and post reproductive age groups
D	Stable age pyramid	IV	The percent individuals of pre-reproductives and reproductive age group are same

Match List I with List II.

	List I (Interacting species)		List II (Name of interaction)
A	Leopard and a Lion in a forest/grassland	I	Competition
B	A Cuckoo laying egg in a Crow’s nest	II	Brood parasitism
C	Fungi and root of a higher plant in Mycorrhizae	III	Mutualism
D	A cattle egret and a Cattle in a field	IV	Commensalism

Choose the correct answer from the options given below

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List I		List II
A	Two or more alternative forms of a gene	I	Back cross
B	Cross of F₁progeny with homozygous recessive parent	II	Ploidy
C	Cross of F progeny with any of the parents	III	Allele
D	Number of chromosome sets in plant	IV	Test cross

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