Given below are two statements: Statement I: Cleistogamous flowers are invariably autogamous. Statement II: Cleistogamy is disadvantageous as there is no chance for cross pollination.
In the light of the above statements, choose the correct answer from the options given below :
The term used for transfer of pollen grains from
anthers of one plant to stigma of a different plant
which, during pollination, brings genetically different types of pollen grains to stigma, is :
In some members of which of the following pairs of
families, pollen grains retain their viability for months after release?
AI-generated explanation. Check against your textbook.
Explanation:
Months-long pollen viability is seen in some members of Rosaceae and Leguminosae (Fabaceae). Thus, the pair Rosaceae; Leguminosae (option 4) is correct. In NCERT, Poaceae (grasses) pollen is typically short-lived and loses viability quickly, while Solanaceae pollen also has limited longevity. Some Rosaceae and Fabaceae pollen grains are highly durable under dry conditions, enabling them to remain viable for extended periods.
🧠 Did You Know?
Dry, well-protected pollen grains can stay viable for months in certain plant families, aiding plants with delayed fertilization strategies.
💡 NCERT Memory Line:
Pollen grains in some plants can remain viable for months under dry storage, notably in Rosaceae and Leguminosae.
Which of the following is incorrect for wind-pollinated plants?
AI-generated explanation. Check against your textbook.
Explanation:
The incorrect statement is option 2. NCERT explains that wind-pollinated flowers are not showy, with small flowers, exposed stamens, and a feathery stigma to catch pollen. They produce large amounts of light, smooth pollen (non-sticky) and pollen is wind-dispersed. The number of ovules is not emphasized as a characteristic feature in wind pollination; typically, these plants do not rely on visual attraction for pollination, so having many ovules per ovary is not a defining trait highlighted in NCERT for wind-pollinated plants.
🧠 Did You Know?
Wind-pollinated flowers are usually inconspicuous and lack nectar, unlike many insect-pollinated flowers.
💡 NCERT Memory Line:
Wind-pollinated flowers: exposed stamens, feathery stigma, small and dull flowers, pollen light and non-sticky.
