A typical angiosperm anther is:
1. Bilobed and polythecous
2. Unilobed and monothecous
3. Multilobed and monothecous
4. Bilobed and dithecous
What is true about the vegetative cell in the pollen tube?
1. | It is smaller than the generative cell |
2. | It has an irregular shaped nucleus |
3. | It floats in the cytoplasm of the generative cell |
4. | It has a dense cytoplasm lacking food reserves |
In a multicarpellary syncarpous ovary:
1. | There is more than one pistil that is fused with the other |
2. | There is more than one pistil that is free from each other |
3. | There is one pistil that is fused with the stamen |
4. | There is more than one pistil that is fused with the stamen |
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 |