Question

Male and female plants of spinach are identified on the basis of

• A. High leaf sugars, chlorophyll and carotenoids in female plants
• B. High leaf sugars, chlorophyll and carotenoids in male plants
• C. Red venal pigmentation in male plants
• D. Downward cupping in female leaves

Hint:

In dioecious spinach, female plants produce more leaf biomass and accumulate higher levels of sugars, chlorophyll, and carotenoids compared to male plants.

Answer 1

The Correct Option is A

Step 1: Understanding the Concept:
Spinach (Spinacia oleracea) is a dioecious leafy vegetable crop with separate male and female plants.
The two sexes show differences in growth rate, vegetative yield, leaf quality, and chemical composition.

Step 2: Detailed Explanation:
In spinach crops, female plants are generally preferred for leafy green production because they are vegetatively superior to male plants.
Female plants grow larger, produce more leaves, and bolt later in the season, which extends the harvesting window.
Male plants are smaller, bolt early, and senesce quickly after releasing pollen.
Biochemically, the leaves of female plants contain significantly higher levels of leaf sugars, chlorophyll pigments, and carotenoids than male plants.
These differences provide female plants with higher photosynthetic capacity and superior nutritional value.
Consequently, the sexes can be identified and evaluated based on these biochemical markers.

Step 3: Final Answer:
Male and female plants of spinach can be distinguished based on the higher levels of leaf sugars, chlorophyll, and carotenoids found in female plants, which corresponds to Option (A).