Home Work #1 - Sexual Reproduction in Flowering Plants - LIVE Short Duration REVISION Course on NEETprep LIVE AppContact Number: 8527521718Home Work #1 - Sexual Reproduction in Flowering Plants - LIVE Short Duration REVISION Course on NEETprep LIVE AppContact Number: 8527521718The cells of which of the following layers of the anther wall are multinucleated due to endomitosis?
(1) Epidemis
(2) Endothecium
(3) Middle layer
(4) Tapetum
A 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
In what percent of angiosperms are the pollen grains shed at three cell stage?
(1) 20
(2) 40
(3) 60
(4) 80
The intine of the pollen grain is a:
1. Thick and discontinuous layer made of sporopollenin
2. Thick and continuous layer made of sporopollenin
3. Thin and discontinuous layer made of cellulose and pectin
4. Thin and continuous layer made of cellulose and pectin
Which one of the following statements is not true?
| 1. | Exine of pollen grains is made up of sporopollenin |
| 2. | Pollen grains of many species cause severe allergies |
| 3. | Stored pollen in liquid nitrogen can be used in the crop breeding programmes |
| 4. | Tapetum helps in the dehiscence of anther |
Pollen tablets are available in the market for
(1) In vitro fertilisation
(2) breeding programmes
(3) supplementing food
(4) Ex situ conservation
An organic substance that can withstand environmental extremes and cannot be degraded by any enzyme is
1. cuticle
2. sporopollenin
3. lignin
4. cellulose
Which one of the following is resistant to enzyme action?
(1) Cork
(2) Wood fibre
(3) Pollen exine
(4) Leaf cuticle
Male gametes in angiosperms are formed by the division of:
(1) microspore
(2) generative cell
(3) vegetative cell
(4) microspore mother cell
Male gametophyte in angiosperms produces
1. two sperms and a vegetative cell
2. single sperm and a vegetative cell
3. single sperm and two vegetative cells
4. three sperms
Which one of the following statements is not true?
1. Pollen grains are rich in nutrients and they are used in the form of tablets and syrups
2. Pollen grains of some plants cause severe allergies and bronchial afflictions in some
people
3. The flowers pollinated by flies and beetles secrete foul odour to attract them
4. Honey is made by bees by digesting pollen collected from flowers
Pollen grains are able to withstand extremes of temperature and dessication because their exine is composed of
(1) cutin
(2) suberin
(3) sporopollenin
(4) callose
What is the charasteristic of tapetum ?
(1) It does not store food.
(2) It is multi-nucleated.
(3) It is multi-layered structure.
(4) It nourishes the megaspore.
The pollen grains of rice and wheat lose their viability in ___ minutes of their release.
(1) 30
(2) 10
(3) 60
(4) 90
The following is the diagram of T.S. of anther. Identify the parts labelled A, B and C.
| 1. | A - Connective tissue, B - Pollen grains, C - Endothecium |
| 2. | A - Endothecium, B -Connective tissue, C - Pollen grains |
| 3. | A - Pollen grains, B - Connective tissue, C - Endothecium |
| 4. | A - Endothecium, B - Pollen grains, C - Connective tissue |
What is the number of microsporangia in each lobe of an angiosperm anther?
(1) Four
(2) Two
(3) Eight
(4) One
Which among the following extend longitudinally to become pollen sac?
(1) Microsporangia
(2) Filament of anther
(3) Tapetum
(4) Endothecium
Which among the following is not a wall layer of microsporangium?
(1) Endothecium
(2) Nucellus
(3) Tapetum
(4) Middle layers
All of the following statements are correct except:
| 1. | The proximal end of the filament is attached to the thalamus or the petal of the flower. |
| 2. | The anther is a four-sided structure consisting of four microsporangia, two in each lobe.
|
| 3. | The number and length of stamens are variable in flowers of different species.
|
| 4. | In a longitudinal section, a typical microsporangium appears near circular in outline. |
Which among the following statement is incorrect with respect to tapetum?
(1) It nourishes developing pollen grains.
(2) It has dense cytoplasm.
(3) It is the innermost wall layer of microsporangia.
(4) Cells have single nucleus only.
Match the following:
| 1 | Sporogenous tissue | I | Process of formation of microspores from PMC by meiosis |
| 2 | Microspore tetrad | II | Microspores arranged in cluster of four cells |
| 3 | Microsporogenesis | III | Formation of microspore tetrad by meiosis |
| 4 | Tapetum | IV | Nourishes pollen grains |
(1) 1-III ; 2-I ; 3-II ; 4-IV
(2) 1-III ; 2-II ; 3-I ; 4-IV
(3) 1-II ; 2-III ; 3-I ; 4-IV
(4) 1-II ; 2-III ; 3-IV ; 4-I
Which among the following is incorrect with respect to microsporogenesis?
(1) The cells of the sporogenous tissue undergo mitotic divisions to form microspore tetrads.
(2) Each cell of the sporogenous tissue is capable of giving rise to a microspore tetrad. Each one is a potential pollen or microspore mother cell (PMC).
(3) The microspores are arranged in a cluster of four cells called as the microspore tetrad.
(4) Inside each microsporangium several thousands of microspores or pollen grains are formed that are released with the dehiscence of anther.
The pollen grains are shed at two-celled stage in
(1) 80% angiosperms
(2) 40% angiosperms
(3) 30% angiosperms
(4) 60% angiosperms
The following figure represents :
(1) Transverse section of young anther
(2) 3-D cut section of mature anther
(3) Cut section of filament
(4) Transverse section of mature filament
Identify A, B and X :-
X contains two cells - A and B. B is bigger than A, it has abundant food reserve and large irregularly shaped nucleus. A is small and floats in the cytoplasm of B. It is spindle shaped with dense cytoplasm and nucleus.
| A | B | X | |
| (1) | Vegetative cell | Generative cell | Pollen grain |
| (2) | Generative cell | Vegetative cell | Pollen grain |
| (3) | Generative cell | Vegetative cell | Anther |
| (4) | Generative cell | Vegetative cell | Filament |
Which among the following is not true about pollen grain?
(1) Rich in nutrients.
(2) Many species cause severe allergies and bronchial afflictions in some people often leading to chronic respiratory disorders– asthma, bronchitis, etc.
(3) Pollen consumption has been claimed to increase the performance race horses.
(4) Parthenium is used against pollen allergy.
Microsporangium is generally surrounded by 4 wall layers. Which of the following 3 wall layers perform the function of protection and help in the dehiscence of anther to release the pollen?
(1) Epidermis, tapetum, endothecium
(2) Epidermis, aril, endothecium
(3) Epidermis, endodermis, mesocarp
(4) Epidermis, middle layer and endothecium
The above diagram shows some stages in microgametogenesis. Identify A, Band C:
A B C
(1) Symmetric spindle Generative cell Vegetative cell
(2) Symmetric spindle Vegetative cell Generative cell
(3) Asymmetric spindle Vegetative cell Generative cell
(4) Asymmetric spindle Generative cell Vegetative cell
The viability of pollen grains depends upon:
(1) Prevailing temperature
(2) Prevailing humidity
(3) Genetic potentiality of the concerned species
(4) All of the above
Which of the following has the least pollen viability?
(1) Cereals like wheat and rice
(2) Members of Rosaceae
(3) Members of Leguminoseae
(4) Members of Solanaceae
A typical angiosperm anther is bilobed with each lobe having two theca i.e. dithecous. Theca is separated often by :
1. A longitudinal groove running lengthwise.
2. A longitudinal groove running breadth wise.
3. A transverse groove running breadth wise.
4. A transverse groove running lengthwise.
Four statements are given below. How many of them are correct?
(1) The anther is a tetragonal structure, with four microsporangia at corners, two in each lobe.
(2) Microsporangia develops further and becomes a pollen sacs.
(3) A typical microsporangia is surrounded by four layered wall, 3-protective and 1 nutritional.
(4) The nutritive layer is densely cytoplasmic with more than one nucleus
Options :
1. 3
2. 4
3. 2
4. 1
Which of the following statement is not correct for pollen grain?
1. It represents male gametophyte.
2. It is a spherical structure, about 25-50 micrometers in diameter.
3. Pollen grains are rich in nutrients.
4. In family rosaceae, leguminoseae and solanaceae pollen lose viability in 30 minute.
Read the statements and select option representing correct statements with respect to stamen.
A. The distal end of filament is attached to thalamus.
B. A typical anther is dithecous and bisporangiate.
C. Connective is sterile vasculated tissue.
D. Microsporangia develop further and become pollen sacs.
1. A & B
2. A & C
3. B & C
4. C & D
How many statement(s) is/are correct for pollen grains?
a. Parthenium is a cause of bronhial afflictions
b. Intine exhibits fascinating array of patterns and designs
c. Cytoplasm of pollen grain is s urrounded by spermoderm
d. Generative cell is present when pollens are shed in 40 percent plants.
1. One
2. Two
3. Three
4. Four
Fossilization of pollen grains is helped by
(1) Compatible protein
(2) Sporopollenin
(3) Cellulose
(4) Pectin
Match the column with respect to pollen grain:
|
Column I |
Column II |
||
|
a) |
Vegetative Cell Nucleus |
(i) |
Abundant Reserve Food & Irregular Nucleus |
|
b) |
Germ Pore |
(ii) |
Spindle shaped with dense cytoplasm |
|
c) |
Exine |
(iii) |
Where the Sporopollenin is absent |
|
(iv) |
Variable Pattern & design |
||
|
(v) |
Continuous layer made up of Cellulose & pectin |
1. a(iv), b(v), c(iii)
2. a(i), b(iii), c(v)
3. a(i), b(iii), c(iv)
4. a(iv), b(i), c(iii)
Which of the following statement is not associated with phenomenon of flowering?
(1) Decision for flowering takes place much before actual flower appears.
(2) During flowering several structural and hormonal changes takes place
(3) During flowering differentiation takes place
(4) Flowering is independent of environmental factors
When anther is young a group of compactly arranged homogenous cells are present in centre it is known as
(1) Sporogenous tissue
(2) Potential pollen mother cell
(3) Both 1 and 2
(4) Conjunctive tissue
The layers in the walls of the microsporangium that helps in the dehiscence of anther to release the pollen include:
| I: | Epidermis |
| II: | Endothecium |
| III: | Middle layers |
| IV: | Tapetum |
| 1. | I and II only | 2. | I, II, and III only |
| 3. | II and III only | 4. | I, II, III, and IV |
A typical anther shows
a. Two lobes with two theca each
b. Each lobe as dithecous
c. All cells in a given microsporangium as potential PMC
d. Thousands of microspores per microsporangium
Out of these statements :
1. b is incorrect
2. a and b are correct
3. c and d are incorrect
4. a, b, c and d are correct
In a stamen proximal end of filament is attached to
1. Anther.
2. Thalamus or petals.
3. Sepals.
4. Gynoecium.
Which of the following has proved helpful in preserving pollens as fossils?
| 1. | Pollen kit | 2. | Cellulosic intine |
| 3. | Oil content | 4. | Sporopollenin |
Pollen grains can be stored for several years in liquid nitrogen having a temperature of:
| 1. | –120 °C | 2. | –80 °C |
| 3. | –196 °C | 4. | –160 °C |
Arrange the following stages of microspore development into pollen grain, in correct sequence
1. b, c, d, and a
2. b, d, a and c
3. a, c, b and d
4. b, a, d and c
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 pollen grain represents
1. Male gamete
2. Male gametophyte
3. Microsporophyll
4. Microsporangium
Examine the figure given below and select the right option giving all the four parts a,b,c and d. Correctly identify
| a | b | c | d | |
| 1. | Endo- thecium |
Tapetum | Micro- spore mother cell |
Middle layer |
| 2. | Tapetum | Endo- thecium |
Micro- spore mother cell |
Middle layer |
| 3. | Endo- thecium |
Middle layer |
Tapetum | Micro- spore mother cell |
| 4. | Endo- thecium |
Micro- spore mother cell |
Middle layer |
Tapetum |
The inner wall of pollen grain:
1. Is thin, continuous and pecto-cellulosic and is called intine
2. Comes out in the form of pollen tube through germpore
3. Is thick and consists of sporopollenin
4. (1) and (2)
Which is an incorrect statement?
I. Each cell of sporogenous tissue in anther is capable of giving rise to microspore tetrad.
II. The pollen grain represent male gametophyte
III. Pollen grains are usually triangular and 10-15 um in diameter.
IV. Sporopollenin is one of the most resistant organic materials which can be destroyed only by strong acids and alkali.
1. I, II are incorrect but III, IV are correct
2. III, IV are incorrect but I, II are correct
3. I, III are incorrect but II, IV are correct
4. II, IV are correct but I, III are incorrect
Mark the incorrect statement
| 1. | Outer three layers of anther wall are protective in function |
| 2. | Sporogenous tissue occupies the centre of each microsporangium |
| 3. | Cells of tapetum and endothecium show increase in DNA contents by endomitosis and polyteny |
| 4. | Ploidy level of microspore tetrad is haploid |
The cell in the pollen grain which is responsible for giving rise to male gamete is
1. Rod shaped with dense cytoplasm
2. Of smaller size and float in the cytoplasm
3. Capable of dividing meiotically and give rise two male gamete
4. It has abundant food reserve and large irregularly shaped nucleus.
Read the following statements carefully and select the correct
a. Tapetum cells possess dense cytoplasm and generally have more than one nucleus
b. Sporopollenin is absent in the areas called germ pore
c. Generative cell is small, spindle shaped with a irregularly shaped nuclei
d. Spindle of first mitosis in pollen is asymmetric
1. a,b,c & d
2. a,b & c
3. a,c & d
4. a,b & d
What is the most common shape and size of pollen grain in angiosperms plants?
1. Spindle-shaped, 25-50
2. Spherical, 2-5
3. Spherical, 25-50
4. Spindle-shaped, 2-5
Pollen grains lose viability within 30 minutes of their release in the members of family
1. Rosaceae
2. Solanaceae
3. Poaceae
4. Leguminosae
Find the incorrect statements with respect to pollen grain in angiosperms plants
a. Germ pores are areas in pollen wall where intine and sporopollenin are absent
b. The vegetative cell is bigger, has abundant food reserves, and a large irregularly shaped nucleus
c. The fascinating array of patterns and designs are exhibited by exine wall
d. In over 60 percent of angiosperms, pollen grains are shed at 3-celled stage
1. c and d
2. a and d
3. b and d
4. a and c
During microsporogenesis
1. Microspore tetrad is developed by meiosis in sporogenous tissue
2. Pollen grains are developed by mitosis in sporogenous tissue
3. Microspore develops into the male gametophyte
4. Male gametes are produced by pollen grain
A typical anther is
(a) Tetrasporangiate
(b) Tetragonal
(c) Trilobed
(d) Surrounded by four wall layers
The correct ones are
1. Only (a), (b) and (d)
2. Only (a) and (d)
3. Only (b) and (c)
4. All (a), (b), (c) and (d)
The anther wall layer which is usually polyploid and has dense cytoplasm as well as high DNA content is
1. Endothelium
2. Tapetum
3. Epidermis
4. Middle layer
Complete the below given schematic representation by choosing the correct option.
A B C
1. Mitosis Microspore tetrad Meiosis
2. Mitosis Pollen grain Meiosis
3. Meiosis Pollen Syngamy
4. Meiosis Pollen grain Mitosis
Mark the wrongly matched pair
1. Amaranthus - Causes pollen allergy
2. Pollen banks - Store pollen at -196°C
3. Pea - Pollens are viable for only 30 minutes
4. Pollen grains - Rich in nutrients
In the following figure identify the parts labeled as A and B and select the option stating true features of them.
A B
1. Forms gametes Smaller in size
2. Stores food reserve Irregular shaped nucleus
3. Irregular shaped nucleus Spindle-shaped cell
4. Bigger in size Forms female gametes
The outermost and innermost wall layers of microsporangium in an anther are respectively.
1. Endothecium and tapetum
2. Epidermis and endodermis
3. Epidermis and middle layer
4. Epidermis and tapetum
During microsporogenesis, meiosis occurs in
1. endothecium
2. microspore mother cells
3. microspore tetrads
4. pollen grains
