MCQ on Sexual Reproduction in Flowering Plants

Mcq on Sexual Reproduction in Flowering Plants

1. Ovule integument gets transformed into

a) Seed

b) Fruit wall       

c) Seed coat       

d) Cotyledons

2. Triple fusion in angiosperm is the fusion of second sperm with

a) Antipodal cell and one synergid cell   

b) Two antipodal cells

c) Two synergid cells      

d) Two polar nuclei

3. Which one of the following pairs of plants structures has haploid number of chromosomes?

a) Megaspore mother cell and antipodal cells     
b) Egg cell and antipodal cells
c) Nucellus and antipodal cells   
d) Egg nucleus and secondary nucleus

4. Self-incompatibility is a device for

I. Ensuring cross-pollination

II. Preventing self-pollination

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

5. How many numbers of nuclei are involved in fertilization?

a) 1        
b) 2       
c) 3        
d) 5

6. Ovules contain many embryos in

a) Citrus              
b) Orange
c) Mango            
d) All of these

7. Maximum viability of rice and wheat is

a) 60 min            
b) 50 min            
c) 40 min             
d) 30 min

8. Find out A, B and C in the flow chart given below

 a) A-Female gamete, B-Male gamete, C-Endosperm

b) A- Endosperm, B- Female gamete, C- Male gamete

c) A- Female gamete, B-Polar nuclei, C- Endosperm

d) A- Female gamete, B- Endosperm C-Male gamete

9. For a gene if AA = male plant, BB = female plant. Find out the genotype of endosperm and embryo

a) AAB, BBA       
b) AAB, AB         
c) ABB, AB          
d) BBA, AAB

10. In the given diagram, parts labelled as A, B, C, D, E and F are respectively identified as

 a) Synergids, polar nuclei, central cell, filiform apparatus and egg

b) Polar nuclei, egg, antipodals, central cell, filiform apparatus and polar nucei

c) Egg, synergids, central cell, filiform apparatus, antipodals and polar nuclei 

d) Central cell, polar nuclei filiform apparatus, antipodals, synergids and egg

11. Micropyle helps in 

a) Germination of pollen grain   
b) Growth of pollen tube

c) Coming out of pollen tube from pollen grain   
d) Allowing entry of pollen tube

12. The ovary after fertilization is converted into

a) Embryo           
b) Endosperm   
c) Fruit 
d) Seed

13. Which of these is not essential for allogamy?

a) Self-sterility  
b) Dichogamy   
c) Heterogamy 
d) None of these

14. 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

15. ‘In coconut the cellular endosperm surrounds the nuclear endosperm’.

The above statement is

a) True 
b) False
c) Sometimes (a) and sometimes (b)       
d) Neither (a) nor (b)

16. Hermaphrodite flower have

a) Male and female on same plant
b) Male and female on same flower
c) Male and female on different flower 
d) Male and female on difference plant

17. Unisexuality of flowers prevents

a) Autogamy, but not geitonogamy         
b) Geitonogamy and xenogamy
c) Geitonogamy, but not xenogamy        
d) Autogamy and Geitonogamy

18. Stalk with which ovules attached to the placenta is called

a) Funicle            
b) Raphe             
c) Hilum               
d) Chalaza

19. Self-pollination means

a) Occurrence o male and female sex organs in the same flower

b) Germination of pollens within the anther

c) Transference of pollens from anther to the stigma within the same flower

d) Transference of pollens from one flower to another on the same plant

20. Meiotic cell division takes place during

a) Gametogenesis          
b) Embryogenesis           
c) Organogenesis            
d) Parthenogenesis

1              (a)

The common asexual reproductive structures in sponges are gemmules, and in penicillium are conidia. The vegetative propagules in Agave, water hyacinth and bryophyllum are bulbil, offset and leaf buds, respectively.

2              (d)

In angiosperm, fusion of second sperm with two polar nuclei is called triple fusion.

3              (b)

In most cases, the mature embryo sac contains 7 cells and 8 nuclei, i.e., egg apparatus with two haploid synergid cells and one haploid egg cell at micropylar end, two haploid polar nuclei in a single central cell (which later fuse to form diploid secondary nucleus) at the middle and three haploid antipodal cells at the chalazal pole.

4              (b)

I, II, III and IV are correct

Flowering plants have developed many devices to discourage self-pollination. In some species, pollen, releases and stigma receptibility is non-syncronised, i.e., either the pollen is released before the stigma becomes receptive or stigma becomes receptive much before the release of pollen.

In some other species the anther and stigma are placed at the different positions so that the pollen can not come in contact with the stigma of same flower. Both these devices prevent autogamy.

The third device to prevent inbreeding is self-incompatibility. This is genetic a mechanism and prevents self pollination (from same flower or other flower of same plant) from fertilizing the ovules by inhibiting pollen germination or pollen tube growth in pistil

5              (d)

Nuclei involved in fertilization Two nuclei from polar cell, two nuclei from male gametes (generative and vegetative) and one nucleic from egg cell

6              (d)

In citrus, mango plants some of the nucellar cell surrounding the embryo sac starts dividing, protrude into embryo sac and develop into many embryos. In such species each ovule contains many embryos. Occurrence of more than one embryo is referred to as polyembryony

7              (d)

30 min.

The period in which the pollen grains remain viable is highly variable. It depends on the temperature and humidity. In some cereals such as rice and wheat, the pollen grains loose viability with in 30 minutes of their release and in some members of Rosaceae, Leguminosae and Solanaceae, they maintain variability for months

9              (c)

Endosperm Genotype Endosperm is formed by fusion of male gamet and polar nuclei so, the genotype of endosperm is ABB

Embryo Genotype Embryo is formed by fusion gametes (1n) of male and female. So, the embryo genotype is AB

10           (a)

Polyhonum type of embryo sac is 7-celled, 8-nucleate, i.e., composed of 3 antipodals, 2 synergids one egg and one central cell.

11           (d)

Micropyle is the narrow or passage left by the integuments at one end of the ovule. It allows the entry of pollen tube into the ovule. This phenomenon is known as porogamy, e.g., lily.

12           (c)

A fruit is a seed containing part of a plant that develops from a fertilized ovary and often from other tissue that surround it.

13           (d)

Allogamy is also known as cross pollination, i.e., involvement of male and female gametes of two different flowers.

14           (d)

Microsporangium is mainly surrounded by four layers/wall, i.e., Epidermis, endothecium, middle layer and tapetuem

(i) Epidermis endothecium and middle layer help in protection and dehiscence of anther from pollen

(ii) Tapetum nourishes the developing pollen grain

15           (a)

True.

In coconut endosperm two type of division takes place, cellular and nuclear and it is the female gametophyte not male. In coconut endosperm cellular endosperm surrounds the nuclear endsopores

16           (b)

Hermaphrodite flower is also called monoecious or bisexual flower. Majority of plants have this type of flowers

17           (a)

Unisexuality of flowers prevents autogamy(self pollination) but not geitonogamy(pollination between separate male and female flowers on the same plant).

18           (a)

The funiculus is stalk like part, which attaches the ovule to placenta in an ovary.

19           (c)

Self-pollination involves the transfer of pollen grains from the anther to the stigma of the same flower.

20           (a)

Meiosis is a type of cell division in which the chromosomes number becomes half. This type of division takes place only during gametogenesis, because gametes have haploid or half chromosomes than parents