Botany XII - Sexual Reproduction in Flowering Plants 04

Question : 1

The dominant biotic pollinating agent among insect is

Options:

	Butterflies
	Bees
	Flies and beetles
	Wasps and ants

Solution :

(B)

Bees are the dominant pollinating agents
among insects.

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Question : 2

(skipped)

The flowers pollinated by flies and beetle
 

Options:

	Secrete foul odours
	Secrete fragrance
	Are odourless and nectarless
	Have nectar but are odourless

Solution :

(A)

Flies and beetle are attracted towards
foul odours.

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Question : 3

(skipped)

In the tallest flower of Amorphophallus the floral rewards are in
 

Options:

	Nectar
	Pollen
	Safe place to lay eggs
	All of these

Solution :

(C)

Floral reward in Amorphophallus is safe
place to lay eggs.

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Question : 4

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Find the mis-matched pair w.r.t. plant and pollinator

      Plant                Pollinator

(1)   Yucca       –      Blastophaga
(2)   Ficus        –      Gall insect
(3)   Ophrys      –      Colpa
(4)   Ravenela   –       Lemur

Options:

	1
	2
	3
	4

Solution :

(A)

Yucca – Pronuba

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Question : 5

(skipped)

Identify the type of pollinating mechanism depicted in the diagram given below.

Options:

	Translator mechanism in Calotropis
	Piston mechanism in Centaurea
	Fly trap mechanism in Aristolochia
	Turn pipe mechanism in Salvia

Solution :

(D)

Turn pipe/Lever mechanism in Salvia

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Question : 6

(skipped)

Mark the correct option.
     Type of                      Examples                      Exceptions
     pollination                  (Plants)
(1) Ornithophily                 Callistemon,                   Callistemon
                                       Sterlitza,
                                       Adansonia
(2) Cheiropterophily           Bombax,                        Bombax
                                       Anthocephallus,
                                       Sausage tree
                                       Baobab tree

(3) Malacophily                 Arums,                           Lemna
                                       Lilies,
                                       Arisaema,
                                       Lemna
(4) Ophiophily                   Santalum,                      Santalum
                                       Kigelia,
                                       Kadamb,
                                       Michelia

Options:

	1
	2
	3
	4

Solution :

(B)

Pollination-Exception
Ornithophily – Adansonia (Bat-pollinated)
Cheiropterophily – Bombax (Bird
pollinated)
Malacophily – No exception as all given
examples are pollinated by snails
Ophiophily – Kigelia and Kadamb (Batpollinated)

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Question : 7

(skipped)

Emasculation is the removal of
 

Options:

	Stigma from male parent
	Stigma from female parent
	Anthers from bisexual male parent
	Anthers from bisexual female parent

Solution :

(D)

Emasculation is the removal of anther
from bisexual female parent.

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Question : 8

(skipped)

Mark the incorrect statements w.r.t. artificial hybridisation.
I. Breeding of different species and often genera to combine desired characters to produce commercially ‘superior’ varieties.
II. Female parent may produce bisexual or unisexual flowers, there is no need of emasculation.
III. Bagging is done after the floral buds open.
IV. Emasculation and bagging technique prevent contamination from unwanted pollen.
 

Options:

	I & III only
	I & IV only
	II & III only
	II & IV only

Solution :

(C)

If female parent produces unisexual
flowers, there is no need of
emasculation.
Bagging is done before the floral buds
open.

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Question : 9

(skipped)

Study of pollen germination in laboratory
 

Options:

	Cannot be done in Vinca and Crotolaria
	Pollen tubes will be observed only under high power microscope
	Occurs on a glass slide containing a drop of 10% sugar solution
	It takes 30–60 minutes for a pollen tube to emerge

Solution :

(C)

Study of pollen germination in laboratory
is known as – Hanging drop method.
Can be done in Vinca and Crotolaria.
Pollen tubes can be observed and low
power microscope.
It takes 15–30 minutes, for a pollen tube
to emerge.

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Question : 10

(skipped)

Match the columns w.r.t. structures responsible for
attracting insects for pollination.
      Column I                                   Column II
a.   Colourful bracts              (i)          Mussaenda
b.   Leaves                          (ii)          Mimosa
c.   One sepal                     (iii)          Poinsettia
d.   Anthers                         (iv)          Bougainvillea
 

Options:

	a(iv), b(iii), c(ii), d(i)
	a(iv), b(iii), c(i), d(ii)
	a(i), b(ii), c(iii), d(iv)
	a(ii), b(i), c(iii), d(iv)

Solution :

(B)

Coloured bracts – Bougainvillea
Leaves – Poinsettia
One sepal – Mussaenda
Anthers – Mimosa