SSC CGL Previous Year Questions: Biology (2023-20) - 5 with solutions -

- The correct match is option C: i-b, ii-a, iii-d, iv-c.
- This means:
- i corresponds to b
- ii corresponds to a
- iii corresponds to d
- iv corresponds to c
- Each element in column A matches with its respective element in column B based on the context or theme provided in the question, ensuring logical consistency and correct association.
- Understanding these associations correctly will lead to option C as the accurate answer.

Statement I: Amoeba ingests its food with the help of pseudopodia.
Correct. Amoeba uses pseudopodia to surround and engulf food particles, a process called phagocytosis.

Statement II: Amoeba constantly changes its shape and position. 
Correct. Amoeba has a flexible cell membrane and cytoplasm, allowing it to change shape and move via amoeboid movement.

Hence, the correct answer is Option C.

To measure the population density of fish in lakes effectively, the best method is to assess: The number of fish caught per trap
This approach allows researchers to estimate how many fish are present in a specific area. By using traps, they can calculate the density based on the number of fish captured over a set time period.
Other options, such as counting tadpoles, measuring oxygen density, or evaluating zooplankton growth, do not directly relate to fish population density.

Hence, the correct answer is Option A.

The correct answer is C: i-d, ii-c, iii-b, iv-a.
- i-d: Match the first item in the left column to the fourth item in the right column.
- ii-c: Match the second item in the left column to the third item in the right column.
- iii-b: Match the third item in the left column to the second item in the right column.
- iv-a: Match the fourth item in the left column to the first item in the right column.

This alignment ensures each item is paired correctly based on the logical connection or category between the columns.