Question

Select the correct statements:
i. A seed may fail to germinate due to impermeable and hard seed coat.
ii. Carrot is an annual plant.
iii. The site of perception of light in plants is shoot apices.

• A. Only i is correct
• B. Both i and iii are correct
• C. Only ii is correct
• D. Both ii and iii are correct

Answer 1

The correct option is A Only i is correct

Some seeds fail to germinate even when the external conditions are favourable. Such seeds are called dormant seeds. It is believed that seed dormancy is not controlled by external environmental conditions but by conditions present within the seeds like impermeable and hard seed coat and the presence of chemical inhibitors.

Biennial plants are flowering plants that have a lifespan of 2 years. They normally produce flowers and die in the second season. Carrot, cabbage, and sugarbeet are some of the common examples of biennial plants. On the other hand, an annual plant completes its life cycle within one growing season and then dies. Examples of annual plants are rice, wheat, and maize.

Photoperiodic stimulation or photoperiodism is defined as the response by an organism to the lengths of day and night. It has been observed that a lot of plants need periodic exposure to light for the induction of flowering. Leaves are considered to be the site of perception for photoperiodic stimulation.