E. Answer the following questions in brief.
1. What is reproduction?
2. What is artificial vegetative propagation?
3. Name some plants which bear unisexual flowers.
4. What is pollination? What happens when male and female cells fuse together?
5. Differentiate between self-pollination and cross-pollination.
6. How is the dandelion seed dispersed?
7. What is the importance of seed dispersal for plants?
Answers
Answer:
1. Reproduction is the production of offspring. There are two main forms: sexual and asexual reproduction. In sexual reproduction, an organism combines the genetic information from each of its parents and is genetically unique. In asexual reproduction, one parent copies itself to form a genetically identical offspring.
2. Artificial vegetative propagation is the deliberate production of new plants from parts of old plants by humans. This can be done by following. Layering: In this method, a young branch is bent and pressed into moist soil.
Answer:
1)
The process of producing babies or young.
2)
Artificial vegetative propagation is the deliberate production of new plants from parts of old plants by humans. This can be done by following. Layering: In this method, a young branch is bent and pressed into moist soil.
3)
Coconut flowers, Papaya, Watermelon, Cucumber, Maize, White mulberry, Musk melon,Castor bean, Marrow, Luffa, Snake gourd, Bitter gourd, Tapioca, Pumpkin, American holly, Birch, Pine, Gopher purge, Tungoil bean.
4)
Pollination is the process that brings these male and female gametes together. Pollen can't get from the anthers to the ovules on its own, so pollination relies on other things to move the pollen. ... Many flowers can be pollinated by their own pollen – a process called self-pollination.
5)
Self-pollination occurs when the pollen from the anther is deposited on the stigma of the same flower, or another flower on the same plant. Cross-pollination is the transfer of pollen from the anther of one flower to the stigma of another flower on a different individual of the same species.
6)
Dispersal Mechanisms: Seeds can be dispersed long distances by wind because they move in updrafts. Longevity: Dandelion seeds are not long lived in the soil. Dormancy: The seed of dandelion are not dormant and can germinate immediately in the same year that they mature of the plant.
7)
Dispersal of seeds is very important for the survival of plant species. If plants grow too closely together, they have to compete for light, water and nutrients from the soil. Seed dispersal allows plants to spread out from a wide area and avoid competing with one another for the same resources.