I. Population evolve to maximise their reproductive fitness, also called Darwinian fitness
(higher 'r' value) in the habitat in which they live
II. The population growth rate r is inversely related to generation time
III. The housefly , which has a short life span and produces a large number of eggs, could be considered as a K selected species
IV. under a particular set of selection pressures, organisms evolve towards the most efficient reproductive strategies
V. life history traits of organisms have evolved in relation to the constrains imposed by biotic and abitioc factors in their habitat.
Select the combination of correction statements

Options

A. I,II and III
B. I,III and IV
C. III ,IV and V
D. all except III

Answer

To determine the correct combination of statements regarding population evolution and reproductive strategies, let's analyze each statement one by one.

### Step 1: Analyze Statement I
**Statement I:** "Population evolve to maximise their reproductive fitness, also called Darwinian fitness (higher 'r' value) in the habitat in which they live."
- This statement is **partially correct**. While populations do evolve to maximize reproductive fitness, the term "Darwinian fitness" typically refers to the ability to survive and reproduce, which can be indicated by both 'r' (intrinsic growth rate) and 'K' (carrying capacity). However, higher 'r' value is more associated with r-selected species, which focus on rapid reproduction.

### Step 2: Analyze Statement II
**Statement II:** "The population growth rate r is inversely related to generation time."
- This statement is **correct**. A shorter generation time typically allows for faster population growth, leading to a higher 'r' value.

### Step 3: Analyze Statement III
**Statement III:** "The housefly, which has a short lifespan and produces a large number of eggs, could be considered as a K selected species."
- This statement is **incorrect**. Houseflies are actually considered r-selected species because they have short lifespans and produce many offspring quickly.

### Step 4: Analyze Statement IV
**Statement IV:** "Under a particular set of selection pressures, organisms evolve towards the most efficient reproductive strategies."
- This statement is **correct**. Organisms adapt their reproductive strategies based on environmental pressures to maximize their reproductive success.

### Step 5: Analyze Statement V
**Statement V:** "Life history traits of organisms have evolved in relation to the constraints imposed by biotic and abiotic factors in their habitat."
- This statement is **correct**. Life history traits are influenced by environmental factors, including both biotic (living) and abiotic (non-living) components.

### Conclusion
Based on the analysis:
- **Correct Statements:** II, IV, V
- **Incorrect Statements:** I (partially), III

### Final Answer
The combination of correct statements is: **II, IV, V**.

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