Short Day Plants

Q.

An example of shortday plant is

1. Potato

2. Tomato

3. Cotton

4. Sunflower

Q.

Plants that require exposure to light for less than critical period in order to flower are called _______.

1. Day neutral plants

2. Short day plants

3. Long day plants

4. Long, short day plants

Q.

One set of a plant was grown at 12 hours a day and 12 hours night period cycles and it flowered while in the other set night phase was interrupted by a flash of light and it did not produce a flower. Under which one of the following categories will you place this plant?

1. Darkness neutral

2. Day neutral

3. Short day

4. Long day

Q.

Winter varieties are usually planted in:

1. Summer

2. Spring

3. Winter

4. Autumn

Q.

The phase of growth which is the first phase and represents lag phase of growth curve is

1. Formative phase

2. Cell enlargement phase

3. Maturation phase

4. Stationary phase

Q.

Which of the following can stop flowering in short day plants?

1. Longer but discontinuous dark period

2. Photoperiod longer than critical duration

3. Very short photoperiod

4. All of the above

Q. Match the following:

1. Unaffected by light
2. 8-10 hours of light
3. 14-16 hours of light

Q. The critical photoperiod for two flowering plants X and Y are 10 hours. At 14 hours of light per day, plant X flowers but there are no flowers on Y. Can you categorize the two plants according to their photoperiodic response?

1. X-Short day plant, Y-Day neutral plant
2. X-Long day plant, Y-Short day plant
3. X- Short day plant, Y- Long day plant
4. X- Long day plant, Y-Day neutral plant

Q. A plant is kept in darkness for 24 hours and a flash of light is provided in dark period. The plant shows flowering. This plant should be a:

1. Long day plant
2. Short day plant
3. Day neutral plant
4. $C_4$ plant

Q.

Question 26:

Nicotiana tobacum, a short day plant, when exposed to more than critical period of light fails to flower. Explain.