Dioecious plants are those in which the male and female reproductive organs are present on separate plants.
In the case of papaya, individual plants can be either male or female, and both male and female flowers are produced on separate plants.
Therefore, the correct answer for an example of a dioecious plant is (A) Papaya.
The correct answer is:
Option 1: Papaya
A dioecious plant is a plant species where individual plants have either male or female reproductive organs, but not both. In other words, male and female flowers are found on separate plants.
Papaya is a dioecious plant, meaning it has separate male and female plants. Only female plants produce fruit, while male plants produce pollen.
The other options are incorrect because:
Cucurbita (Option 2) is typically monoecious, meaning it has both male and female flowers on the same plant (e.g., pumpkins, squashes).
Coconut (Option 3) is also monoecious, with both male and female flowers on the same plant.
Mango (Option 4) is generally monoecious as well.
Thus, papaya is an example of a dioecious plant.

Identify the labelled parts P, Q, R, and S in the stages of a dicot embryo shown in the diagram.

Choose the option that indicates correct labelling of 'P', 'Q', 'R', and 'S' of embryo in different stages of its development.
Which of these options is true in the context of the below diagram of pollen grain?

Match the following:
In the following, \( [x] \) denotes the greatest integer less than or equal to \( x \). 
Choose the correct answer from the options given below:
For x < 0:
f(x) = ex + ax
For x ≥ 0:
f(x) = b(x - 1)2