Organisms and Populations

Which one of the following statements cannot be connected to Predation?

1. It helps in maintaining species diversity in a community
2. It might lead to extinction of a species
3. Both the interacting species are negatively impacted
4. It is necessitated by nature to maintain the ecological balance

While explaining interspecific interaction of population, (+) sign is assigned for beneficial interaction, (−) sign is assigned for detrimental interaction and (0) for neutral interaction. Which of the following interactions can be assigned (+) for one species and (−) for another species involved in the interaction?

1. Predation
2. Amensalism
3. Commensalism
4. Competition

If '8' Drosophila in a laboratory population of '80' died during a week, the death rate in the population is individuals per Drosophila per week.

1. 0.1
2. 10
3. 1.0
4. zero

Two butterfly species are competing for the same nectar of a flower in a garden. To survive and coexist together, they may avoid competition in the same garden by :

1. Predating on each other
2. Feeding at the same time
3. Choosing different foraging patterns
4. Increasing time spent on attacking each other

In spite of interspecific competition in nature, which mechanism the competing species might have evolved for their survival?

1. Predation
2. Resource partitioning
3. Competitive release
4. Mutualism

Amensalism can be represented as :

1. Species A (+); Species B (0)
2. Species A (-); Species B (0)
3. Species A (+); Species B (+)
4. Species A (-); Species B (-)

In the exponential growth equation Nt = N0ert, e represents

1. The base of geometric logarithms
2. The base of number logarithms
3. The base of exponential logarithms
4. The base of natural logarithms

Match List-I with List-II Choose the correct answer from the options given below.

1. (a)-(iv), (b)-(iii), (c)-(ii), (d)-(i)
2. (a)-(iv), (b)-(ii), (c)-(iii), (d)-(i)
3. (a)-(iv), (b)-(i), (c)-(iii), (d)-(ii)
4. (a)-(iv), (b)-(i), (c)-(ii), (d)-(iii)

In the light of the above statements, choose the correct answer from the options given below

1. (A) is false but (R) is true
2. Both (A) and (R) are true and (R) is the correct explanation of (A)
3. Both (A) and (R) are true but (R) is not the correct explanation of (A)
4. (A) is true but (R) is false

Secondary metabolites such as nicotine, strychnine and caffeine are produced by plants for their

1. Nutritive value
2. Growth response
3. Effect on reproduction
4. Defence action