What is meant by monosporic development of female gametophyte?
(a) Hypocotyls and epicotyls
(b)Coleoptile and coleorhiza
(c)Integument and testa
(d)Perisperm and pericarp
Why is apple called a false fruit? Which part(s) of the flower forms the fruit?
What is apomixis and what is its importance?
What is filiform apparatus?
How is it possible in oxalis and viola plants to produce assured seed- sets even in the absence of pollinators?
Pea flowers produce assured seed- sets. Give a reason.
Name the part of the flower, which the tassels of the corn cab represent.
Why do corn cobs have long tassels?
How are the pollen grains protected from wetting by water, in case of hydrophily?
How do the pollen grains of vallisneria protect themselves?
Name the seeds that have retained their viability for thousands of years?
Name two parasitic species of plants that produce many minute seeds in a fruit.
Differentiate between the two cells enclosed in a mature male gametophyte of an angiosperm.
Not all hydrophytes are pollinated by water. Justify by giving two examples.
How is pollination affected in sea grasses?
Explain the mutually rewarding relationship between yucca plant and a species of moth.
Name the product of fertilization that forms the kernel of coconut. How does the kernel differ from coconut water?
How is parthenocarpy different from parthenogenesis? Give an example of each.
Why are some seeds of citrus referred to as polyembryonic? How are they formed?
if you squeeze a seed of orange, you might observe May embryos of different sizes. How is it possible? Explain.
Name and explain the mechanism by which seeds from hybrid plants are developed that are able to retain the desired hybrid character in the progeny .
What will be the advantage of making the hybrids into apomicts? Why?
How are cleistogamous and chasmogamous flowers different from each other? Give an example for each.
- Describe the endosperm development in coconut.
- Why is tender coconut considered a healthy source of nutrition?
- How are pea seeds different from castor seeds with respect to endosperm?
A flower of a tomato plant following the process of sexual reproduction produces 240 viable seeds. Answer the following questions giving reasons.
- What is the minimum number of pollen grains that must have been involved in the pollination of its pistil?
- What would have been the minimum number of ovules present in the ovary?
- How many megaspore mother cells are involved?
- What is the minimum number of microspore mother cells involved in the above case?
- How many male gametes were involved in this case?
Give reason why?
- Most zygotes in angiosperms divide only after a certain amount of endosperm is formed.
- Groundnut seeds are exalbuminous and castor seeds are albuminous.
- Micropyle remains as a small pore in the seed coat of a seed.
- Integuments of an ovule harden and the water content is highly reduced, as the seed matures.
- Apple and cashew are not called true fruits.
Explain the role of tapetum in the formation of pollen-grain wall?