When the embryosac develops from a single functional megaspore [the other three get generate], it is called as:
1. | Monosporic | 2. | Bisporic |
3. | Trisporic | 4. | Tetrasporic |
Geitonogamy is:
1. | Functionally cross–pollination but genetically autogamy |
2. | Functionally autogamy but genetically cross-pollination |
3. | Functionally and genetically autogamy |
4. | Functionally and genetically cross-pollination |
Which of the following is/are a marine plant pollinated by water?
1. | Vallisneria | 2. | Hydrilla |
3. | Zostera | 4. | Both 1 and 2 |
In angiosperms, triple fusion results in the formation of:
1. | Zygote | 2. | Endosperm |
3. | Nucellus | 4. | PEC |
Identify the incorrect statement regarding Parthenium hysterophorus:
1. | Its pollens are a very common cause of severe respiratory allergies. |
2. | It was introduced in India accidentally as a contaminant in wheat. |
3. | It is a native of tropical America |
4. | It is non-invasive and limited to certain pockets in India only |
Match the structure in Column I with the description in Column II and choose your answer from the codes given below:
Column I | Column II | ||
A. | Stigma | a. | Landing platform for pollen grains |
B. | Ovary | b. | Basal bulged part of the pistil |
C. | Placenta | c. | Part of the ovary where funiculus attaches |
D. | Ovule | d. | Megasporangium |
Codes
A | B | C | D | |
1. | a | b | c | d |
2. | a | c | b | d |
3. | b | a | d | c |
4. | d | c | b | a |
The only type of pollination which during pollination brings a genetically different type of pollen grains to the stigma is:
1. | Chasmogamy | 2. | Cleistogamy |
3. | Geitonogamy | 4. | Xenogamy |
Identify the incorrect statement regarding water-pollinated flowers:
1. | Pollination by water is rare and is seen in monocotyledons mostly |
2. | Pollen grains in most are covered by a mucilaginous covering |
3. | Produce nectar |
4. | Are not very colourful |
Whether a pollen grain will be able to germinate on a stigma is primarily decided by:
1. | The stage at which the pollen is shed |
2. | Recognition by the stigma |
3. | Maturity of the egg cell in the embryosac |
4. | Environmental conditions |
Syngamy in angiosperms results in the formation of:
1. | A haploid cell | 2. | A diploid cell |
3. | A triploid cell | 4. | A polyploid cell |