b. Write one peculiarity of A.
- A= Twisted, B. Vexillary/ Papilionaceous.
- One margin of each member overlap that of the next one.
- Standard petal, wing petals, keel petal (anterior small petal).
b. Define venation.
(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:
|
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 ............
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) Aestivationii) Phyllotaxyiii) Placentationiv) 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:
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.
(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.
✔️Answer:
1.
Valvate.
2.
Twisted.
3.
Vexillary.
Vexillary is the aestivation of pea flowers.