Mcq on Sexual Reproduction in Flowering Plants

Sexual Reproduction in Flowering Plants Sexual Reproduction in Flowering Plants

1. Wind pollinated flowers are

a) Small, brightly coloured, producing large number of pollen grains

b) Small, producing large number of dry pollen grains

c) Large producing abundant nectar and pollen

d) Small, producing nectar and dry pollen

2. Wind pollination is common in

a) Lilies

b) Grasses          

c) Orchids           

d) Legumes

3.‘Cells at the chalazal end are called synergid cells. The above statement is

a) True 

b) False

c) Sometimes (a) and sometimes (b)       

d) Neither (a) nor (b)

4.Orthotropous ovule belongs to

a) Urtica              

b) Polygonum   

c) Peperomea  

d) All of these

5.Center of each microsporangium is occupied by

a) Sporogenous tissue

b) Spongious tissue

c) Central tissue

d) Microspore mother cell

6.Which of the following plant products is the hardest?

a) Lignin              

b) Cutin

c) Suberin

d) Sporopollenin

7.Functional megaspore develops into …A… also called …B…

A and B in the above sentence is

a) A-Female gametophyte; B-Embryo sac             

b) A-Embryo sac; B-Female gametophyte

c) A-Endosperm; B-Nucellus       

d) A-Microsporangium; B-Megasporangium

8.Syngamy and triple fusion is called …A… . The central cell becomes …B… develops into …C… and zygote develops into …D…

A, B, C, D in the above statement are

a) A-Fusion, B-haploid, C-diploid cell, D-embryo

b) A-double fertilization, B-PEN, C-endosperm, D-embryo

c) A-embryo, B-endosperm, C-PEN, D-diploid cell

d) A-PEN, B-endosperm, C-syngamy, D-fertilisation

9.Dicot embryo consists of

a) Radicle and plumule

b) Radicle, plumule, cotyledons and sometimes endosperm

c) Radicle, plumule, cotyledons and tegmen

d) Radicle, plumule, cotyledons and tegmen and testa

10.First three layers of microsporangium which does the function of protection are

a) Epidermis, endothecium, middle layer              

b) Epidermis, mesocarp, endocarp

c) Epidermis, middle layer, endothecium              

d) Epidermis, endocarp, mesocarp

11.Nucellar polyembryony is reported in species of

a) Gossypium   

b) Triticum         

c) Brassica          

d) Citrus

12.Nucellus forms which of the following parts of fruit?

a) Seed coat

b) Perisperm     

c) Seed

d) Raphe

13.Mesogamy is

a) Fusion of male and female gametes

b) Fusion of physiologically similar and morphologically different gametes

c) Entry of pollen tube through integuments

d) None of the above

14.Identify the correct statement.

a) Because of marked climatic variations, plants growing near the sea shore do not produce annual rings

b) The age of the plant can be determined by its height

c) Healing of damaged tissue is because of the activity of sclerenchyma cells

d) Grafting is difficult in monocot plants as they have scattered vascular bundles

15.Which of the following perform microsporogenesis?

a) Microspore mother cell           

b) Pollen mother cell

c) Both (a) and (b)           

d) None of these

16.Tapetum is found in

a) Anther

b) Microspore  

c) Male gametophyte    

d) Female gametophyte

17.Double fertilization was discovered by

a) Nawaschin    

b) Strasburger  

c) Emerson         

d) None of these

18.Microsporangium produces

a) Male gametes             

b) Female gametes        

c) Pollen              

d) Both (a) and (c)

19.Grafting is successful in dicots but not in monocots because the dicots have

a) Vascular bundles arranged in a ring

b) Cambium for secondary growth

c) Vessels with element arranged end to end

d) Cork cambium

20.Megaspore mother cell is found near the region of

a) Micropyle      

b) Chalaza          

c) Nucellus         

d) Integuments

1              (b)

Wind pollinated flowers are small, producing large number of pollen grains.

3              (b)

False In the embryo sac the cells, which are present at the chalazal end are called antipodal cells. At the micropylar end the synergid and egg cells are present.

Mature embryo sac

4              (d)

In orthotropous ovule (also called atropous or erect ovule), chalaza, micropyle and funicle lie in straight line, e.g., Urtica, Polygonum and Peperomea. This is a primitive type of ovule.

5              (d)

In center there is microspore mother cell. In which meiosis takes place which leads to formation of pollen grains

6              (d)

Sporopollenin is a polymer, tougher than lignin but with similar properties, composed chiefly of carotenoids, makes the exine of spores and pollen grains of plants providing resistance to biodegradation. It is the hardest plant product.

7              (a)

A-female gametophyte, B-embryo sac. Female gametophyte is the combination of many cells. They are synergid cell, egg cell, antipodal cell and polar nuclei

8              (b)

A-double fertilization, B-PEN, C-Endosperm, D-Embryo

9              (b)

Dicot embryo has radicle, plumule, cotyledons and sometimes endosperm.

10           (c)

Epidermis middle layer, endothecium, they are present outerly and have the function of protection. But sometime endothecium does the function of nourishment

11           (d)

Occurrence of more than one embryo in a seed is reffered as polyembryony. In many Citrus and mango varieties, some of the nucellar cells surrounding the embryo sac start dividing, protrude into the embryo sac and develop into the embryos. In such species, each ovule contains many embryos (nucellar polyembryony).

12           (b)

The post fertilization changes in the seeds are as follows:

Ovule – Seed                               Ovary - Fruit

Nucellus – Perisperm (a nutritive tissue)

Integument – Seed coat.

13           (c)

In rare cases, the pollen tube may pierce through integuments as in Populus, Cucurbita or through funiculus as in Pistacia. It is called mesogamy.

14           (d)

Grafting is difficult in monocot plants as they have scattered vascular bundles. Vascular bundles with cambium is necessary for grafting while in monocot, no such cambium is present in vascular bundles.

15           (c)

Microspore mother cell and pollen mother cell are the same term and form male gametes (pollens) by the process called microsporogenesis

16           (a)

Tapetum is the innermost layer of anther wall.

17           (a)

Double fertilization was discovered by Nawaschin and Strasburger.

18           (d)

Pollens contain male gametes hence both the terms are used in angiosperms during sexual reproduction

19           (b)

In grafting technique, two parts of two related plants are joined, so as to form composite plant. In this, one plant having strong root system, is called stock, while the other having better shoot is called scion or graft. The grafting technique is successful in two related plants having vascular cambium (characteristic feature of dictoyledons). Later is absent in monocotyledons, so grafting cannot be possible in monocots.

20           (a)

Ovules generally differentiate a single Megaspore Mother Cell (MMC) in the micropylar region of the undifferentiated tissue (nucellus). It is a large cell containing dense cytoplasm and prominent nucleus. The MMC undergoes meiotic division