Revision DPP - 10-Nov-24Contact Number: 8527521718Revision DPP - 10-Nov-24Contact Number: 8527521718A typical angiosperm anther is dithecous which means that it is:
1. One lobed and the lobe has two theca
2. Two lobed and each lobe has two theca
3. Two lobed and each lobe has one theca
4. Four lobed and each lobe has two theca
Which one of the following pairs of plant strucutre has haploid number of chromosomes?
(1) Megaspore mother cell and antipodal cells
(2) Egg cell and antipodal cells
(3) Nucellus and antipodal cells
(4) Egg nucleus and secondary nucleus
A typical angiosperm bilobed and dithecous anther consists of how many theca?
(1) Two
(2) Four
(3) Eight
(4) Three
Which among the following is incorrect with respect to vegetative cell of pollen grain?
(1) It has irregularly shaped nucleus.
(2) It has abundant food reserve.
(3) It is spindle shaped with dense cytoplasm.
(4) It is bigger as compared to generative cell.
Following are four statements how many of them are correct?
a. The anther is a tetragonal structure, with four microsporangia at corners, two in each lobe.
b. Microsporangia develops further and becomes pollen sacs.
c. A typical microsporangia is surrounded by four-layered wall, 3-protective and 1 nutritional.
d. The nutritive layer is densely cytoplasmic and with more than one nucleus
Options :
1. 3 2. 4
3. 2 4. 1
Which of the following is/are a marine plant pollinated by water?
| 1. | Vallisneria | 2. | Hydrilla |
| 3. | Zostera | 4. | Both 1 and 2 |
In over 60 % of angiosperms, pollen grains are shed at:
| 1. | 2-celled stage | 2. | 3-celled stage |
| 3. | 4-celled stage | 4. | 1-celled stage |
The embryo of a grass seed is enclosed by two protective sheaths, a(n) _________, which covers the young shoot, and a(n) __________, which covers the young root.
(1) plumule; radical
(2) hypocotyl; picotyls
(3) coleoptile; coleorhiza
(4) scutellum; replum
A, B, C and D in the following diagram respectively are:
(1) Epidermis, endothecium, middle layers, tapetum
(2) Epidermis, middle layers, PMC, tapetum
(3) Endothecium, middle layers, microspore mother cells, tapetum
(4) Epidermis, middle layers, tapetum, PMC
Following are four statements find out correct statements
(i) Microsporangia has four layers, outer three are protective and inner one is nutritive
(ii) Each cell of sporogenous tissue within micorsporangia is capable of giving raise to a microspore tetrad.
(iii) Dehydration of anther is important for seperation of pollen grains in a tetrad.
(iv) Generative cell in pollen grain is small with respect to vegetative cell and it floats in cytoplasm of vegetative cell.
Options
1. All are correct
2. Only (i), (ii) and (iii) is correct
3. Except (ii) all are correct
4. Expect (iii) all are correct.
The number of mitotic generations required to form a mature embryo sac from megaspore in most of the flowering plants is
1. One
2. Two
3. Three
4. Four
The cells of which of the following layers of the anther wall are multinucleated due to endomitosis?
(1) Epidermis
(2) Endothecium
(3) Middle layer
(4) Tapetum
The beginning of the male gametophyte is an angiosperm is:
(1) Microsporangium
(2) Microspore mother cell
(3) Microsporophyll
(4) Microspore
During the formation of an embryo sac, the divisions in the functional megaspore:
(1) are cellular
(2) are free nuclear
(3) six are free nuclear and one is cellular
(4) seven are free nuclear and one is cellular
Pollen grains lose their viability within 30 minutes of their release in
1. Rice
2. Legumes
3. Rose
4. Potato
Q.2 Embryo sac is to ovule as ......... is to an anther.
1. stamen
2. filament
3. pollen grain
4. androecium
In grasses what happens in microspore mother cell for the formation of mature pollen grains:
1. One meiotic and two mitotic divisions
2. One meiotic & one mitotic division
3. One meiotic division
4. One mitotic division
The following diagram shows:
1. Multicarpellary, syncarpus pistil of Papaver
2. Multicarpellary, apocarpus pistil of Papaver
3. Multicarpellary, apocarpus gynoecium of Michelia
4. Multicarpellary, syncarpus gynoecium of Michelia
| 1. | A | 2. | B |
| 3. | C | 4. | D |
| A | B | C | D | |
| 1. | T | T | F | T |
| 2. | T | F | T | F |
| 3. | F | F | T | T |
| 4. | F | T | T | F |
| I: | syngamy requires one male gamete and one egg cell |
| II: | triple fusion requires one male gamete, one egg cell and one polar nucleus |
| A | B | C | D | |
| 1. | Coleorhiza | Shoot apex | Epiblast | Radicle |
| 2. | Scutellum | Coleoptile | Shoot apex | Coleorhiza |
| 3. | Coleoptile | Cotyledon | Epiblast | Radicle |
| 4. | Scutellum | Coleoptile | Epiblast | Coleorhiza |
| Assertion (A): | Tapetum is formed during the process of the formation of microsporangium. |
| Reason (R): | It plays an important role in guiding the pollen tube into the synergid. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True and (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | (A) is False but (R) is True. |
| 1. | Epidermis | 2. | Middle layers |
| 3. | Endothecium | 4. | Tapetum |
| A: | Nectar and pollen grains are the usual floral rewards. |
| B: | In some species floral rewards are in providing safe places to lay eggs. |
| 1. | Only A is correct | 2. | Only B is correct |
| 3. | Both A and B are correct | 4. | Both A and B are incorrect |
