Friday, November 13, 2020

Morphology of Flowering Plants | Class 11 | Previous Years Questions and Answers (2015 to 2020)

MORPHOLOGY OF FLOWERING PLANTS


2020 MARCH


1.  Observe the figures A and B. (Score 3)



    a. Identify the aestivation A and B.
    b. Write one peculiarity of A.
    c. Name the three kinds of petals in B.

    ✔️Answer:
  1. A= Twisted, B. Vexillary/ Papilionaceous.
  2. One margin of each member overlap that of the next one.
  3. Standard petal, wing petals, keel petal (anterior small petal).
2. Observe the figures A and B given below: (Score 2)


    a. Name the type of venation in A and B.
    b. Define venation.


    ✔️Answer: 

    (a) A= Reticulate venation, B= Parallel venation.
    (b) It is the arrangement of veins and veinlets in the leaf lamina.


2019 JULY IMPROVEMENT


1.   Observe the given floral diagram. (Score 3)



a. Identify the family.
b. Write down any two distinguishing features of gynoecium.
c. Write any two economically useful plants belonging to this family.

✔️Answer:

(a) Liliaceae
(b) Tricarpellary, syncarpous, superior ovary
(c) Aloe, Asparagus, Tulip

2019 MARCH


1.  Write three peculiarities of gynoecium seen in Solanaceae and Fabaceae. (Score 3)


✔️Answer:

Solanaceae Gynoecium: Bicarpellary obligately placed, syncarpous; ovary superior, bilocular.
Fabaceae Gynoecium: Ovary superior, mono carpellary, unilocular with many ovules.

2.  Names of three plants are given below. (Score 3)

a.     Rhizophora

b.     Bougainvillea

c.     Pea

Name the modifications seen in these plants. Write their functions.


✔️Answer:

(a) Pneumatophores: Function is respiration.
(b) Thorn: Function is protection.
(c) Tendrils: Function is mechanical support.

2018 JULY IMPROVEMENT


1.   The following figures A and B shows two different types of phyllotaxy. (Score 2)



Identify the phyllotaxy A, B and explain them.


✔️Answer:


A – Opposite: Leaves lie opposite to each other (A pair of leaves at each node).

B – Whorled: More than two leaves at each node


2.  Based on the symmetry, the flowers can be classified into three types. Name and explain them. (Score 3)


✔️Answer:

  • Actinomorphic / Radial: A flower can be divided into two equal halves through the centre in any plane.
  • Zygomorphic / bilateral: A flower can be divided into two equal halves through the centre only in one plane.
  • Asymmetric / irregular: A flower cannot be divided into two equal halves by any plane through the centre.

2018 MARCH


1.   Observe the relationship between the first two terms and fill in the blank. (Score 1)

Epipetalous stamen – Brinjal     …………… – Lily


✔️Answer: Epiphyllous.


2.   Match the following: (Score 2)


A

B

a) Calotropis

i) Vexillary

b) China rose

ii) Valvate

c) Cassia

iii) Twisted

d) Pea

iv) Imbricate


✔️Answer:


A

B

a) Calotropis

ii) Valvate

b) China rose

iii) Twisted

c) Cassia

iv) Imbricate

d) Pea

i) Vexillary

 

2017 JULY (IMPROVEMENT)


1.   In the family Fabaceae, stamens are described as ............ (Score 1)

a) Five, epipetalous

b) Ten, diadelphous

c) Six, epipetalous

d) Six, diadelphous 


✔️Answer: a) Ten, diadelphous


2.   Observe the diagrams given below.



Name the type of flowers A and B. Give one example of each. (Score 2)


✔️Answer:


A= Hypogynous. E.g. Mustard.

B= Epigynous. E.g. Guava.


3.   Write two differences between racemose and Cymose inflorescence. (Score 2)


✔️Answer:


o Racemose: The main axis continues to grow. Flowers are borne laterally in an acropetal succession.

o Cymose: The main axis terminates in a flower, hence is limited in growth. Flowers are borne in a basipetal order.


 2017 MARCH


1.  a)  The arrangement of flowers on the floral axis is called


i) Aestivation 
ii) Phyllotaxy
iii) Placentation 
iv) Inflorescence

    b) How can you differentiate an actinomorphic flower from a zygomorphic flower? (Score 3)


✔️Answer:


a) iv) Inflorescence

b) o Actinomorphic (radial symmetry): Here, a flower can be divided into 2 equal radial halves in any radial plane passing through the centre.

o Zygomorphic (bilateral symmetry): Here, a flower can be divided into two similar halves only in a particular vertical plane.


2016 MARCH


1.  Observe the given floral diagram: (Score 3)


a) Identify the family. 

b) Write any four floral characters of the identified family. 


✔️Answer:


a) Lilaceae.

b)   o Inflorescence: Solitary / cymose.

o Flower: Bisexual; actinomorphic.

o Perianth tepal six.

o Androecium: Stamen six.


2015 SEPTEMBER (IMPROVEMENT)


1.   Four stem modifications are given below. Three of them are underground modifications. Pick the odd one out as your answer. (Score 1)


(Potato, Opuntia, Ginger, Colocasia)


✔️Answer:


Opuntia. Here the stem modification is Phylloclade (green, flattened or fleshy cylindrical stem).


2.   Write the names of aestivations in figures 1, 2 and 3. Identify aestivation of petals in pea flowers from the above three aestivations. (Score 2)



✔️Answer:


1. Valvate.

2. Twisted.

3. Vexillary.


Vexillary is the aestivation of pea flowers.


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