Advertisements
Advertisements
प्रश्न
Make a list of any three outbreeding devices that flowering plants have developed and explain how they help to encourage cross-pollination.
List any three outbreeding devices that flowering plants have developed for cross-pollination and explain how they help to encourage cross-pollination.
Advertisements
उत्तर
- Dichogamy: Flowers are unisexual, so self-pollination is not possible. The plants may be monoecious, bearing both male and female flowers (e.g. maize), or dioecious, bearing male and female flowers on separate plants (e.g. mulberry, papaya).
- Prepotency: Pollen grains of another flower germinate more rapidly on the stigma than pollen grains of the same flower. Examples of this include apples and grapes.
- Self-sterility (Self-incompatibility): Pollen grains of a flower do not germinate on the stigma of the same flower because of the presence of similar self-sterile genes. Examples of this include tobacco, potatoes, and crucifers.
APPEARS IN
संबंधित प्रश्न
As a senior biology student you have been asked to demonstrate to the students of secondary level in your school, the procedure(s) that shall ensure cross-pollination in a hermaphrodite flower. List the different steps that you would suggest and provide reasons for each one of them.
Explain the post-pollination events leading to seed production in angiosperms.
Name the part of the flower which the tassels of the corn- cob represent.
Mention two strategies that evolved to prevent self-pollination in flowers.
Why does self-pollination not lead to seed formation in self-incompatible species?
Define the term Pollinating.
Mention any two contrivances in flowers which favour cross-pollination.
Describe the advantages and disadvantages of cross-pollination to the plant.
What is a flower? Draw a typical flower and label its different parts.
Differentiate Between Cross Pollination and Self Pollination:
Give an account of any two biotic agents for pollination along with their adaptations.
From among the situations given below, choose the one that prevents both autogamy and geitonogamy.
A particular species of plant produces light, non-sticky pollen in large numbers and its stigmas are long and feathery. These modifications facilitate pollination by ______.
Insect pollinated flowers are ______.
Which one of these statements is incorrect?
The following statements seem to describe the water-pollinated submerged plants.
Autogamy can occur in a chasmogamous flower if ______.
Choose the correct statement from the following:
From among the situations given below, choose the one that prevents both autogamy and geitonogamy.
Name the pollinating agent of a flowering plant with large and coloured flowers with sticky stigma. State one characteristic feature of the pollen grains produced in such flowers.
Which one of the following flower is hypohydrophilous?
