CBSE Class 12 Biology Reproduction In Flowering Plants Worksheet Set A

Important Questions for NCERT Class 12 Biology Sexual Reproduction in Flowering Plants

Question. During embryo sac formation how many nuclei out of eight nucleus go through cytokinesis or wall formation?
(a) All eight
(b) Two
(c) Six
(d) Four
Answer. C

Question. Geitonogamy is the transfer of pollen grains from anther to stigma of another flower of the same plant is :-
(a) Functionally cross pollination
(b) Genetically self pollination
(c) Ecologically cross pollination
(d) All the above
Answer. D

Question. Genetically geitonogamy is
(a) Allogamy
(b) Xenogamy
(c) Autogamy
(d) Cleistogamy
Answer. C

Question. Which of the following pollen structure exhibits a fascinating array of patterns and designs (Sculpturing pattern)?
(a) Germpores
(b) Exine
(c) Intine
(d) Tapetum
Answer. B

Question. Regarding to formation of pollen grain from microspore which of the following statement is incorrect
(a) Generative cell is bigger
(b) Vegetative cell possess irregularly shaped nucleus
(c) Generative cell floats in cytoplasm of vegetative cell
(d) Vacuole is present in vegetative cell
Answer. A

Question. Endosperm is completely consumed by developing embryo in
(a) Castor
(b) Coconut
(c) Wheat
(d) Pea
Answer.D

Question. What will be the ploidy of the cells of functional megaspore and female gametophyte respectively:
(a) n, n
(b) 2n, 2n
(c) n, 2n
(d) 2n, n
Answer. A

Question. Regarding to cross pollination which of the following statement is incorrect?
(a) Plants use two abiotic and one biotic agent
(b) Majority of plants use abiotic agents for pollination
(c) Production of enormous amount of pollen grains is concerned to compensate uncertainity and loss of pollens
(d) Pollination by wind is more common among abiotic pollinations
Answer. B

Question. About wind pollination which of the following is incorrect?
(a) Light and non sticky pollengrains
(b) Well exposed stamens
(c) Feathery stigma
(d)Highly scented flowers
Answer. D

Question. Chalaza represents the
(a) Tip of the ovule
(b) Base of the ovule
(c) Both (1) & (2)
(d) Stalk of the ovule
Answer. B

Question. Identify A to G in following figure and answer accordingly.

(a) A–Ovary, B–Filament, C–Sepal, D–Petal, E–Style,F–Stigma, G–Anther
(b) A–Sepal, B–Ovary, C–Petal, D–Filament, E–Anther,F–Stigma, G–Style
(c) A–Ovary, B–Sepal, C–Filament, D–Petal, E–Anther,F–Stigma, G–Style
(d) A–Petal, B–Anther, C–Stigma, D–Style, E–Filament,F–Sepal, G–Ovary
Answer.C

Question. Find odd one out. 
(a) Stamen
(b) Stigma
(c) Style
(d) Ovary
Answer.A

Question. Identify A to D in the following diagram.

(a) A – Filament (stalk) , B – Pollen sac,C – Pollen grain, D – Line of dehiscence
(b) A – Filament (stalk), B – Pollen sac,C – Line of dehiscence, D – Pollen grain
(c) A – Line of dehiscence, B – Filament (stalk) ,C – Pollen sac, D – Pollen grains
(d) A – Filament (stalk), B – Line of dehiscence,C – Pollen sac, D – Pollen grains
Answer.D

Question. The terminal structure of stamen is called
(a) pollen
(b) filament
(c) anther
(d) All of these
Answer.C

Question. The lengthwise running groove on anther which separate theca is called
(a) rupture line
(b) line of dehiscence
(c) suture of anther
(d) None of the above
Answer.B

Question. Number of microsporangia in an angiospermic anther is
(a) 1
(b) 2
(c) 3
(d) 4
Answer.D

Question. Microsporangium develops into
(a) pollens
(b) microgametes
(c) megagametes
(d) pollen sac
Answer.D

Question. Identify A to E in the following diagram.

(a) A–Tapetum, B–Microspore mother cell, C–Middle layer, D–Endothecium, E–Epidermis
(b) A–Epidermis, B–Middle layer, C–Microspore mother cell, D–Tapetum, E–Endothecium
(c) A–Middle layer, B–Epidermis, C–Tapetum, D–Microspore mother cell, E–Endothecium
(d) A–Epidermis, B–Endothecium, C–Middle layer, D–Microspore mother cell, E–Tapetum
Answer.D

Question. The innermost layer of microsporangium is
(a) tapetum
(b) endothecium
(c) middle layer
(d) epidermis
Answer.A

Question. Centre of each microsporangium is occupied by
(a) sporogenous tissue
(b) tapetum
(c) central tissue
(d) microspore mother cell
Answer.A

Question. Identify A to E in the following diagram.

(a) A–Epidermis, B–Endodermis, C–Connective,D–Sporogenous tissue, E–Middle layers, F–Tapetum
(b) A–Endodermis, B–Connective, C–Epidermis,D–Tapetum, E–Sporogenous tissue, F–Middle layers
(c) A–Tapetum, B–Middle layers, C–Sporogenous tissue,D–Connective, E–Endodermis, F–Epidermis
(d) A–Connective, B–Epidermis, C–Endothecium,D–Sporogenous tissue, E–Tapetum, F–Middle layers
Answer.D

Question. The outermost wall layer of microsporangium in anther is
(a) endothecium
(b) tapetum
(c) middle layer
(d) epidermis
Answer.D

Question. Which of the following perform microsporogenesis?
(a) Microspore mother cell
(b) Pollen mother cell
(c) Both (a) and (b)
(d) None of these
Answer.C

Question. The process of formation of microspores from pollen mother cell through … A… is called … B... .
Microspores are arranged in … C … . As the anthers matures and dehydrate, microspores develop into the …D… .
Fill in the blanks A to D.
(a) A–pollen grains, B–microspore tetrad,C–microsporogenesis, D–meiosis
(b) A–microspore tetrad, B–microsporogenesis,C–meiosis, D–pollen grains
(c) A–microsporogenesis, B–microspore tetrad,C–pollen grain, D–meiosis
(d) A–meiosis, B–microsporogenesis, C–microspore tetrad, D–pollen grains
Answer.D

Question. Microspore tetrad (pollen grains) is the result of
(a) mitotic cell division
(b) meiotic cell division
(c) Both (a) and (b)
(d) None of these
Answer.B

Question. Dehiscence of anther in mesophytes is caused by
(a) hydration of anthers
(b) dehydration of anthers
(c) mechanical injury
(d) None of these
Answer.B

Question. Pollens have two prominant walls which are …A… and …B… . Here A and B refers to
(a) A–intine, B–protein coat
(b) A–exine, B–intine
(c) A–sporopollenin, B–intine
(d) A–sporopollenin, B–exine
Answer.B

Question. Intine is made up of
(a) cellulose
(b) pectin
(c) Both (a) and (b)
(d) protein
Answer.C

Question. Exine of pollen is made up of
(a) sporopollenin
(b) sporogenous tissue
(c) spongiform tissue
(d) inorganic material
Answer.A

Question. Patterns and designs of exine of pollen grains are the characteristic features of
(a) species of plant
(b) genus of plants
(c) order of plants
(d) None of these
Answer.A

Question. Hardest substance in plant kingdom is 
(a) saple
(b) corolla
(c) sporopollenin
(d) anther
Answer.C

Question. The sporopollenin is non-degradable because
(a) it can withstand strong acids
(b) it is resistant at very high temperature
(c) no enzyme degrade it
(d) All of the above
Answer.D

Question. Which of the following has proved helpful in preserving pollen as fossils? 
(a) Oil content
(b) Cellulosic intine
(c) Pollenkitt
(d) Sporopollenin
Answer.D

Question. The functions of germ pore is/are
(a) emergence of radicle
(b) absorption of water for seed germination
(c) initiation of pollen tube
(d) All of the above
Answer.C

Question. Identify the structures marked A to F in the given diagram.

(a) A–Asymmetric nucleus, B–Nucleus, C–Generative cell, D–Vegetative cell, E–Pollen, F–Pollen tetrad
(b) A–Pollen tetrad, B–Pollen, C–Generative cell, D–Vegetative cell, E–Asymmetric spindle, F–Nucleus
(c) A–Pollen tetrad, B–Vacuole, C–Nucleus, D–Asymmetric spindle, E–Vegetative cell, F–Generative cell
(d) A–Vacuole, B–Nucleus, C–Pollen tetrad, D–Vegetative cell, E–Asymmetric spindle, F–Generative cell
Answer.C

Question. When the pollen grain is mature, it contains two cells, the … A … and … B ….
(a) A–generative cell, B–spore mother cell
(b) A–vegetative cell, B–spore mother cell
(c) A–spore mother cell, B–male gamete
(d) A–vegetative cell, B–generative cell
Answer.D

Question. To achieve 3-celled stage in angiosperms, which cell of the pollen grain divides to form two male gametes ?
(a) Vegetative cell 
(b) Generative cell
(c) Microspore mother cell
(d) None of the above
Answer.B

Question. 60% of the angiosperms shed their pollens at the
(a) 2-celled stage
(b) 3-celled stage
(c) 4-celled stage
(d) 1-celled stage
Answer.A

Question. Male gametophyte in angiosperms produces
(a) two sperms and a vegetative cell
(b) single sperm and a vegetative cell
(c) single sperm and two vegetative cell
(d) three sperms
Answer.A

Question. Pollen tablets are available in the market for
(a) in vitro fertilisation
(b) breeding programmes
(c) supplementing food
(d) ex situ conservation
Answer.C

Question. Pollen grains can be stored for several years in liquid nitrogen having temperature of NEET 2018
(a) – 196°C
(b) – 80°C
(c) – 120°C
(d) – 160°C
Answer.A

Question. In the given diagram of pistil, in which part fertilisation takes place?

(a) D
(b) C
(c) B
(d) A
Answer.B

Question. Identify the type of pistil in the diagram

(a) Multicarpellary, apocarpous
(b) Multicarpellary, syncarpous
(c) Multicarpellary, pistillate
(d) Monocarpellary, apocarpous
Answer.B

Question. Identify the type of pistil in the diagram alongside.

(a) Monocarpellary, syncarpous
(b) Monocarpellary, apocarpous
(c) Multicarpellary, syncarpous
(d) Multicarpellary, apocarpus
Answer.D

Question. Identify A to I in the given diagram.

(a) A–Chalazal end, B–Embryo sac, C–Nucellus, D–Inner integuments, E–Outer integuments, F–Micropylar pole,G–Micropyle, H–Funicle, I–Hilum
(b) A–Inner integuments, B–Nucellus, C–Embryo sac,D–Chalazal end, E–Hilum, F–Funicle, G–Micropyle,H–Micropylar end, I–Outer integuments
(c) A–Hilum, B–Funicle, C–Micropyle, D–Micropylarpole, E–Outer integuments, F–Inner integuments,G–Nucellus, H–Embryo sac, I–Chalazal pole
(d) A–Micropylar end, B–Micropyle, C–Funicle, D–Hilum,E–Outer integuments, F–Inner integuments,G–Nucellus, H–Embryo sac, I–Chalazal end
Answer.C

Question. The stalk which joins ovule and placenta is called
(a) funicle
(b) hilum
(c) chalaza
(d) micropyle
Answer.A

Question. The ovule of an angiosperm is technically equivalent to
(a) megasporangium
(b) megasporophyll
(c) megaspore mother cell
(d) megaspore
Answer.A

Question. An ovule is a
(a) differentiated megasporangium
(b) dedifferentiated megasporangium
(c) integumented megasporangium
(d) redifferentiated megasporangium
Answer.C

Question. Chalazal pole is present
(a) opposite to micropyle
(b) at the origin of integuments
(c) opposite to nucellus
(d) near the embryo sac
Answer.A

Question. Mass of cells enclosed by integuments is called
(a) nucellus
(b) embryo
(c) ova
(d) pollen
Answer.A

Question. Embryo sac is also called
(a) female gamete
(b) synergids
(c) female gametophyte
(d) egg of angiosperm
Answer.C

Question. Megasporogenesis is
(a) formation of fruits
(b) formation of seeds
(c) formation of megaspores
(d) Both (b) and (c)
Answer.C

Question. Megaspore mother cell is found near the region of
(a) micropyle
(b) chalaza
(c) nucellus
(d) integuments
Answer.A

Question. In majority of angiosperms 
(a) egg has a filiform apparatus
(b) there are numerous antipodal cells
(c) reduction division occurs in the megaspore mother cells
(d) a small central cell is present in the embryo sac
Answer.C

Question. In angiosperms, microsporogenesis and megasporogenesis 
(a) occur in anther
(b) form gametes without further divisions
(c) involves meiosis
(d) occur in ovule
Answer.C

Question. Functional megaspore in an angiosperm develops into
(a) ovule
(b) endosperm 
(c) embryo sac
(d) embryo
Answer.C

Question. Which is the most common type of embryo sac in angiosperms? 
(a) Tetrasporic with one mitotic stage of divisions
(b) Monosporic with three sequential mitotic divisions
(c) Monosporic with two sequential mitotic divisions
(d) Bisporic with two sequential mitotic divisions
Answer.B

Question.Single megasporic development is called
(a) single sporic
(b) unisporic
(c) monosporic
(d) disporic
Answer.C

Question. Identify A to F in the diagram given below.

(a) A–Mitosis, B–Meiosis-I, C–Meiosis-II, D–Mitosis,E–Meiosis, F–Meiosis
(b) A–Meiosis-I, B– Meiosis-II, C–Mitosis, D–Mitosis,E–Mitosis, F–Embryo sac
(c) A–Embryo, B–Meiosis-I, C–Meiosis-II, D–Mitosis,E–Mitosis, F–Mitosis
(d) A–Mitosis, B–Mitosis, C–Mitosis, D–Meiosis,E–Meiosis, F–Meiosis
Answer.B

Question. Identify the labelling of given diagrams.

(a) A–MMC, B–Megaspore dyad, C–Nucellus, D–Nucleus
(b) A–Nucellus, B–Megaspore dyad, C–Nucellus,D–MMC
(c) A–Nucellus, B–MMC, C–Nucellus, D–Megaspore dyad
(d) A–MMC, B–Nucellus, C–Megaspore dyad, D–Nucleus
Answer.C

ONE MARK QUESTIONS

1. The microscopic pollen grains of the past are obtained as fossils. Mention the characteristic of the pollen grains that makes it happen.

2. Name the type of flower which favours cross pollination.

3. Why is bagging of the emasculated flowers essential during hybridization experiments?

4. The meiocyte of rice has 24 chromosomes. How many chromosomes are present in its endosperm?

5. Why is a coconut plant referred to a monoecious?

6. A bilobed, dithecous anther has 100 microspore mother cells per microsporangium. How many male gametophytes this anther can produce?

TWO MARKS QUESTIONS

7. The flower of brinjal is referred to as chasmogamous while that of beans is cleistogamous. How are they different from each other?

8. Banana is a parthernocarpic fruit whereas oranges show polyembryony. How are they different from each other with respect to seeds .

9. Draw a vertical section of a maize grain and label i) pericarp ii) scutellum c) coleoptile and iv) radicle.

10. How many haploid cells are present in a mature female gametophyte of a flowering plant? Name them.

11. i) Write the characteristic features of anther, pollen and stigma of wind pollinated flowers.

ii) How do flowers reward their insect pollinators? Explain.

13. Draw a longitudinal section of post pollinated pistil showing entry of pollen tube into a mature embro-sac. Label filiform apparatus, chalazal end, hilum, antipodals, male gametes and secondary nucleus.

14. a) Mention any four strategies adopted by flowering plants to prevent self-polliantion.

b) Why is geitonogamy also reffered to as genetical autogamy?

VALUE BASED QUESTION

16 Your younger sister has seen a banana tree in backyard of a house. She could see the fruits but no seeds. She wants to know how a new plant of banana will be produced without seed. What will you explain to your sister?