Question

Day-neutral plants
A. Lose activity during day time
B. Flower in all possible photoperiods
C. Become overactive during day time
D. Do not flower in any photoperiod

Answer 1

Day-neutral plants flower regardless of the length of the period of light it is exposed to. Example- Rice, corn, tomato, pea, and dandelion, and cucumber. Their flowering process is not regulated by day length at all and they bloom when they are simply old enough too.

Complete answer:
Photoperiodism refers to the physiological reaction of organisms to the length of the night or a dark period. It is seen in plants and animals. It can also be defined as the developmental responses of plants to the relative lengths of light and dark periods.

The plants are classified under three groups according to the photoperiods:

Short-day plants
Long-day plants
Day-neutral plants.

The plants that begin flowering when the days are shorter than their critical day length are known as Short-day plants.
They need a long period of darkness and a short period of light to flower.
The plants that begin flowering when the days are longer than their critical day length are known as long-day plants. They flower when they are exposed to a short period of darkness and a long period of light.
The plants that don't depend upon the amount of darkness or daylight hours for flowering are known as Day-neutral plants. Their flowering process is independent of day length. Common examples of day-neutral plants are sunflower and tomato.

Option A- Lose activity during day time
Day-neutral plants never lose activity during day time.

Option B- Flower in all possible photoperiods
Day-neutral plants flower independently of day length.

Option C- Become overactive during day time
The activity of day-neutral plants is not affected by the duration of the day.

Option D- Do not flower in any photoperiod
Day-neutral plants show flowering processes that are not regulated by day length.

Thus, the correct answer is option B.

Note: Day-neutral plants are adapted to thrive in either condition. The self-pollinators in the grass or wheat family are usually day-neutral plants. These also include some of the vine plants or climbing plants like cucumbers.