CBSE Class 12 Biology Sexual Reproduction In Flowering Plants VBQs

Question. Syngamy and triple fusion is called …A… . The central cell becomes …B… develop into …C… and zygote develops into …D… .A, B, C and D in the above statements are
(a) A–fusion, B–haploid, C–diploid cell, D–embryo
(b) A–double fertilisation, B–PEC, C–endosperm, D–embryo
(c) A–embryo, B–endosperm, C–PEC, D–diploid cell
(d) A–PEC, B–endosperm, C–syngamy, D–fertilisation
Answer : B

Question. If stem has 2n =10 number of chromosomes then find out
A – number of chromosome in endosperm.
B – number of chromosome in egg cell.
C – number of chromosome in polar nuclei, respectively.
(a) 15, 15, 20
(b) 10, 15, 20
(c) 15, 5, 10
(d) 10, 5, 15
Answer : C

Question. If endosperm has 36 number of chromosomes then find out the chromosome number of male and female gamete.
(a) 18, 18
(b) 17, 18
(c) 20, 20
(d) 12, 12
Answer : D

Question. PEC (Primary Endosperm Cell) is formed
(a) after triple fusion
(b) before triple fusion
(c) at the time of syngamy
(d) always persisted
Answer : A

Question. In an angiosperm, male plant is diploid and female plant is tetraploid then endosperm will be
(a) haploid
(b) triploid
(c) tetraploid
(d) pentaploid
Answer : D

Question. In angiosperm, pollen tube librates their male gametes into the
(a) central cell
(b) antipodal cell
(c) egg cell
(d) synergids
Answer : D

Question. Out of the following choose the post-fertilisation event(s).
(a) Endospermogenesis
(b) Embryogenesis
(c) Both (a) and (b)
(d) Megasporogenesis
Answer : C

Question. The morphological nature of the edible part of coconut is 
(a) perisperm
(b) cotyledon
(c) endosperm
(d) pericarp
Answer : C

Question. Coconut water from a tender coconut is
(a) immature embryo 
(b) free-nuclear endosperm
(c) innermost layers of the seed coat
(d) degenerated nucellus
Answer : B

Question. Endosperm is consumed by developing embryo in the seed of
(a) pea
(b) maize
(c) coconut
(d) castor
Answer : A

Embryo, Seed and Fruit Formation

Question. A typical dicotyledonous embryo consist of an …A… axis and …B… cotyledons.
The portion of embryonal axis above the level of cotyledons is …C… which terminates with the …D… or stem tip.
A, B, C and D in the above statement are
(a) A–plumule, B–epicotyl, C–cotyledons, D–embryonal
(b) A–embryonal, B–two, C–epicotyl, D–plumule
(c) A–embryonal, B–epicotyl, C–cotyledons, D–plumule
(d) A–embryonal, B–plumule, C–cotyledons, D–epicotyl
Answer : B

Question. The cylindrical portion below the cotyledons is …A… that terminates to …B… and its tip is called …C… . A, B and C here refers to
(a) A–radicle, B–hypocotyl, C–root cap
(b) A–root cap, B–radicle, C–hypocotyl
(c) A–hypocotyl, B–root cap, C–radicle
(d) A–hypocotyl, B–radicle, C–root cap
Answer : D

Question. The wheat grain has an embryo with one large, shield-shaped cotyledon known as 
(a) epiblast
(b) coleorhiza
(c) scutellum
(d) caleoptile
Answer : D

Question. Number of seeds are equal to the
(a) number of ovules
(b) number of ovaries
(c) Both (a) and (b)
(d) None of these
Answer : A

Question. Persistent nucellus in the seed is known as 
(a) perisperm
(b) hilum
(c) tegmen
(d) chalaza
Answer : A

Question. Which is most crucial for seed storage?
(a) Dehydration and dormancy
(b) Endosperm and water
(c) Least amount of development
(d) Endosperm in large quantity
Answer : A

Question. True fruit is directly derived from
(a) stem
(b) root
(c) ovary
(d) None of these
Answer : C

Question. False fruit is a fruit in which
(a) only ovary take part in fruit development
(b) only embryo take part in fruit development
(c) only chalazal cells take part in fruit development
(d) ovary and other floral part are included in fruit development
Answer : D

Question. Thalamus contributes in the fruit formation in
(a) apple
(b) strawberry
(c) cashewnut
(d) All of these
Answer : D

Question. The world’s oldest viable seed, excavated from Arctic Tundra is of
(a) lupine
(b) Ficus
(c) date palm
(d) Phoenix
Answer : A

Question. Viability of date palm (Phoenix dactylifera) seed is
(a) 2000 yrs
(b) 1000 yrs
(c) 500 yrs
(d) 100 yrs
Answer : A

Question. Seed formation without fertilisation in flowering plants involves the process of
(a) budding
(b) somatic hybridisation
(c) apomixis
(d) sporulation
Answer : C

Question. Type of cell division takes place in apomixis is
(a) reductional
(b) meiosis
(c) Both (a) and (b)
(d) mitosis
Answer : D

Question. Ovules contain many embryo in
(a) Citrus
(b) apple
(c) mango
(d) Both (a) and (c)
Answer : D

Question. Occurrence of more than one embryo is called
(a) polyembryony
(b) embryony
(c) parthenogenesis
(d) fertilisation
Answer : A

Question. Vegetative/Asexual reproduction and apomixis are common to each other in
(a) type of cell division
(b) clone nature of offspring
(c) Both (a) and (b)
(d) only in dicot plant
Answer : C

Question. Nucellar polyembryony is reported in
(a) Gossypium
(b) Triticum
(c) Brassica
(d) Citrus
Answer : D

Question. Apomictic embryos in Citrus arise from
(a) synergids
(b) maternal sporophytic tissue in ovule
(c) antipodal cell
(d) haploid egg
Answer : B

Assertion and Reason

In each of the following questions, a statement of Assertion (A) is given followed by corresponding statement of Reason (R). Of the statements, mark the correct answer as
(a) If both A and R are true and R is correct explanation of A
(b) If both A and R are true, but R is not the correct explanation of A
(c) If A is true, but R is false
(d) If A is false, but R is true

Question. Assertion (A) Gynoecium consists of pistil.
Reason (R) It represents the male reproductive part in flowering plants.
Answer : C

Question. Assertion (A) Meiosis is the cell division which occurs in the sexually reproducing organisms.
Reason (R) Meiotic cell division results into two cells having exactly same genetic makeup.
Answer : C

Question. Assertion (A) Flowers are the structures related to sexual reproduction in flowering plants.
Reason (R) Various embryological processes of plants occur in a flower.
Answer : A

Question. Assertion (A) Megaspore mother cell undergoes meiosis to produce four megaspores.
Reason (R) Megaspore mother cell and megaspore both are haploid.
Answer : C

Question. Assertion (A) Pollen grain of angiosperm is considered as the male gametophyte.
Reason (R) Pollen grain contains stigma, style and ovary.
Answer : C

Question. Assertion (A) Geitonogamy is genetically similar to autogamy.
Reason (R) In geitonogamy, pollen grains come from the same plant.
Answer : A

Question. Assertion (A) Cleistogamous flowers produce assured seed set in the absence of pollinators.
Reason (R) Cleistogamous flowers do not open at all.
Answer : A

Question. Assertion (A) Removal of anthers is first step in artificial hybridisation.
Reason (R) It prevents contamination of anthers.
Answer : C

Question. Assertion (A) Endosperm development preceds embryo development.
Reason (R) It assures nutrition to the developing embryo.
Answer : A

Question. Assertion (A) Non-albuminous seeds have no residual endosperm.
Reason (R) The endosperm is completely consumed during embryo development.
Answer : A

Question. Assertion (A) Mango is a false fruit.
Reason (R) The thalamus also contributes to fruit formation in false fruits.
Answer : D

Question. Assertion (A) Some fruits are seedless or contain non-viable seeds.
Reason (R) They are produced without fertilisation.
Answer : A

Question. Assertion (A) In apomixis, plants of new genetic variations are not produced.
Reason (R) In apomixis, reductional division takes place.
Answer : C

Question. Assertion Parthenocarpy involves the formation of seedless fruits. 
Reason Apomixis occurs without fertilisation.
Answer : B

Question. Assertion In apomixis, the plants of new genetic sequence are produced. 
Reason In apomixis, two organisms of same genetic sequence meet.
Answer : D

Statement Based Questions

Question. Read the following statements and choose the correct ones.
I. Non-essential floral organs in a flower are sepals and petals.
II. Stamens represent microsporophylls.
III. Adithecious anther consists of four microsporangia two in each lobe.
IV. The anther wall has middle layer lieing between endothecium and tapetum.
(a) I and II
(b) II and III
(c) III and IV
(d) I, II, III and IV
Answer : D

Question. Which one of the following statement is correct?
(a) Hard outer layer of pollen is called intine
(b) Sporogenous tissue is haploid
(c) Endothecium produces the microspores
(d) Tapetum nourishes the developing pollen
Answer : D

Question. Self-incompatibility is a device for
I. ensuring cross-pollination.
II. preventing self-fertilisation.
III. ensuring self-fertilisation.
IV. genetic control for self-fertilisation.
Choose the correct statements from those given  above.
(a) I, II and III
(b) I, II, III and IV
(c) I, III and IV
(d) I, II and IV
Answer : D

Question. Which of the following statement(s) is/are correct?
I. The stigma serves as a landing platform for pollen grains.
II. Ovarian cavity is also known as ovarian locule and is present inside the ovary.
III. Placenta is located inside the ovarian cavity.
IV. The ovule is attached to the placenta by funicle.
(a) I, II and III
(b) I, II and IV
(c) I and III
(d) I, II, III and IV
Answer : D

Question. Read the following statements.
I. Generative cell is bigger and contains abundant food reserve.
II. Vegetative cell is small and floats in the cytoplasm of the generative cell.
III. In angiosperms various stages of reductional divisions can be studied in young anthers.
IV. Hilum represents the junctions between ovule and funicle.
Choose the option with correct set of statements.
(a) I and II
(b) I and III
(c) II and IV
(d) III and IV
Answer : D

Question. Read the following statements and choose the correct statements.
I. Heterostyly as a contrivance for cross-pollination is
found in Primula vulgaris.
II. Cleistogamous flower is present in Commelina.
III. Tallest flower are of Amorphophallus.
IV. In monoecious condition, both male and female flowers are borne on same plant, an example of such plant is Cucurbita.
(a) I and II
(b) II and III
(c) III and IV
(d) I, II, III and IV
Answer : D

Question. Read the following statements and choose the correct ones.
I. Mature ovules in which micropyle comes to lie close to
the funiculus the ovule is anatropous.
II. When micropyle, chalaza and hilum lie in a straight
line the ovule is said to be orthotropous.
III. Megasporangium along with its protective integument is called ovule.
(a) I and II
(b) II and III
(c) I and III
(d) I, II and III
Answer : D

Question. Consider the following statements.
I. Pollination by bats is known as chiropterophily.
II. Pollination by ants is known as ornithophily.
(a) Both statements I and II are true
(b) Statements I is true, but II is false
(c) Statements I is false, but II is true
(d) Both statements I and II are false
Answer : B

Question. Which one of the following statement is incorrect about pollination?
(a) Anemophily is by wind and occurs in grasses and date palm
(b) Hydrophily is by water and occurs in Zostera, Vallisneria and Ceratophyllum
(c) Entomophily is by insects and occurs in rose, jasmine, Salvia, etc.
(d) Ornithophily is by birds and occurs in Adansonia
Answer : D

Question. Which of the following statement(s) is/are correct about Parthenium (carrot grass)?
(a) Parthenium came into India as a contaminant with imported wheat
(b) It has became ubiquitous in occurrence
(c) It causes pollen allergy
(d) All of the above
Answer : D

Question. Choose the incorrect statement from the following.
(a) Long ribbon-like pollen grains are seen in some aquatic plants
(b) In some insect species, the floral reward for pollination is the safe place to lay eggs in the flower
(c) Insect robbers consume pollens or nectar without bringing about pollination
(d) Majority of the flowering plants produce homosexual flowers
Answer : D

 
Question. Refer to the given characteristics of some flowers :
I. Flowers are small. They are often packed in inflorescence.
II. Flowers are colourless, nectarless and odourless
III. Well exposed stamens.
IV. Pollen grains produced in large number, light and non-sticky.
V. Flowers often have a single ovule in each ovary.
VI. Stigma-large, often feathery.
The above features are the characteristics of
(a) Self-pollination
(b) Anemophily (pollination by wind)
(c) Ornithophily (pollination by birds)
(d) Entomophily (pollination by insects)
Answer : B

Question. The events in pollen-pistil interaction are given below.
I. Pollen grain germinates to form pollen tube.
II. Pollen tube enters the ovule through micropyle.
III. Pollen grain reaches the stigma.
IV. Pollen tube grows through the tissues of stigma and style and reaches the ovary.
The sequential order of their occurrence is
(a) III→ I→ IV→ II
(b) II→ IV→ III→ I
(c) III→ IV→ II→ I
(d) II→ III→ I→ IV
Answer : A

Question. Which of the following statement is correct?
(a) Pollination gives the guarantee of the promotion of post-pollination events that lead to fertilisation
(b) The events ‘from pollen deposition on stigma until pollen tubes enter the ovule’ are together referred to as pollen-pistil interaction
(c) Pollen-pistil interaction is a dynamic process involving pollen recognition followed by only promotion (not rejection) of the pollen
(d) Pistil has no ability to recognise the pollen, whether right or wrong type
Answer : B

Question. Study the following and find correct statement(s).
I. Pollination by water is quite rare in flowering plants and is limited to about 50 genera, mostly monocotyledons.
II. Water is a regular mode of transport for the male
gametes among higher plant groups.
III. Distribution of bryophytes and pteridophytes are limited because of the need of water for transport of male gametes and fertilisation.
(a) Only I
(b) II and III
(c) Only III
(d) Only II
Answer : C

Question. Read the following statements.
I. Double fertilisation was discovered by Nawaschin in Lilium and Fritillaria.
II. The total number of nuclei involved in double fertilisation is five.
III. The central cell of embryo sac, as a result of triple fusion becomes primary endosperm cell (PEC).
IV. Synergids are haploid.
Choose the correct set of statements.
(a) I, II and III
(b) II and IV
(c) I, III and IV
(d) I, II, III and IV
Answer : D

Question. Find out the correct statement(s).
I. Most commonendosperm is of nuclear type.
II. Coconut water is male gametophyte.
III. Coconut has both free-nuclear and cellular type of endosperm.
(a) I, II and III
(b) I and III
(c) II and III
(d) I and II
Answer : B

Question. Find out the correct statement(s).
I. Endosperm formation is the prior event than embryo formation.
II. Angiospermic and gymnospermic endosperm are 3n and n, respectively.
III. Endospermic seeds are found in castor, barley and coconut.
IV. In albuminous seed, food is stored in endosperm and in non-albuminous seeds, it is strored in cotyledons.
(a) I and IV
(b) II and III
(c) I and III
(d) I, II, III and IV
Answer : D

Matching Type Questions

Question. Match the following columns.
Column I                                    Column II
A. Outer integuments                 1. Testa
B. Inner integuments                 2. Tegmen
C. Ovary                                   3. Fruit
D. Ovules                                  4. Seed
Codes
    A B C D 
(a) 1 3 2 4
(b) 3 4 1 2
(c) 1 2 3 4
(d) 4 3 2 1
Answer : C

Question. Match the following columns.
Column I                  Column II
(Ovary)                      (Pistil)
A. Monocarpellary      1. Free pistil
B. Multicarpellary       2. Fused pistil
C. Syncarpous           3. Many pistil
D. Apocarpous           4. Single pistil
Codes
     A B C D
(a) 1 2 3 4
(b) 4 3 2 1
(c) 3 4 2 1
(d) 4 3 1 2
Answer : B

Question. Match the following columns.
Column I                  Column II
A. Antipodal             1. 3n
B. Central cell           2. 2n
C. MMC                    3. (n + n)
D. Endosperm           4. n
Codes
     A B C D
(a) 4 3 1 2
(b) 3 2 1 4
(c) 4 3 2 1
(d) 3 4 1 2
Answer : C

Question. Match the following columns.
Column I                                Column II
(Seeds / Fruits)                     (Examples)
A. Endospermic seed              1. Wheat
B. Non-endospermic seed       2. Mango
C. True fruit                          3. Cashew
D. False fruit                         4. Pea
Codes
    A B C D 
(a) 4 2 3 1
(b) 1 4 2 3
(c) 1 3 2 4
(d) 4 3 2 1
Answer : B