Tag: botany

Questions Related to botany

Monotropa is a

  1. Saprophyte

  2. Symbiont

  3. Parasite

  4. Insectivorous plant


Correct Option: A
Explanation:
Monotropa is a Saprophyte.

Monotropa uniflora (Indian pipe) is a small, low-lying wild flower. It lacks chlorophyll accounting for its translucent white colour. Because it cannot synthesise its own energy, this plant is saprophyte.

Insectivorous plant with rosette of spiny margined bilobed hinged and winged leaves for catching the prey is?

  1. Nepenthes

  2. Drosera

  3. Dionaea

  4. Utricularia


Correct Option: C
Explanation:

Dionaea, also called as venus fly trap has modified itself in order to meet the requirements of nitrogen. Its leaves are turned into bilobed flap-like structures or winged structures surrounded by spines on the margins so that they can trap the insects laying on them.

So the correct answer is 'Dionaea'.

Which one of the following is a total root parasite?

  1. Balanophora$/$ Orobanche

  2. Viscum

  3. Cassytha

  4. Drosera


Correct Option: A
Explanation:

Balanophora is a total root parasite because it sucks sugars, minerals and also water from the roots of host plants like cabbage etc for its survival, in turn, harming the host.

So, the correct option is 'Balanophora/ Orobanche'.

Weight of the largest flower of Rafflesia is

  1. $1$kg

  2. $4$kg

  3. $6$kg

  4. $11$kg


Correct Option: C
Explanation:

Rafflesia bears the largest flowers of the angiosperms. The flowers can grow to 3 feet and can weigh up to 6 kilograms. The plant is parasitic and the vegetative parts are not visible. The flowers are unisexual. The foul smell produced by the flower attracts the pollinator insects.  

Hence, the correct answer is '6kg'

Which one is the largest root parasite?

  1. Rafflesia

  2. Monotropa

  3. Arceuthobium

  4. All the above


Correct Option: A
Explanation:

A. The largest root parasite is rafflesia because rafflesia blooms the largest flower grows to be 3 ft across and almost 50 pounds. The only visible parts of this parasite are usually its flower.

B. Monotropa is not a parasite but saprophyte
C. Arceuthobium is the smallest parasite about 5mm diameter.
so, the correct option is 'Rafflesia'.

Which one of the following is a parasitic plant?

  1. Drosera

  2. Cuscuta

  3. Nepenthes

  4. Utricularia

  5. Water Hyacinth


Correct Option: B
Explanation:

$\Rightarrow$ Cuscuta (Option B)
$\rightarrow$ Characteristics of cuscuta
$\rightarrow$ Cuscuta(dodder) is a parasitic plant. It has no chlorophyll and cannot make its own food by photosynthesis.
$\rightarrow$ It grows on other plants, using their nutrients for its growth and weakening the host plant.
$\rightarrow$ Cuscuta is a leafless plant with branching stems ranging in thickness from thread like filaments to heavy cords.
$\rightarrow$ The mature plant leaves its entire like without touching or attachment to the ground.

A total root parasite on Tomato and Brinjal is

  1. Cistanche

  2. Orobanche

  3. Striga

  4. Balanophora


Correct Option: B

Aerial absorptive root occur in

  1. Epiphytes

  2. Mesophytes

  3. Hydrophytes

  4. Xerophytes


Correct Option: A
Explanation:

Epiphytes are plants that grow attached to other plants. Epiphytes and climbing plants have aerial roots that anchor the plant to the bark, branch or another surface on which it grows. Aerial roots of some epiphytes are specialized not only for anchorage but some have photosynthetic roots (some epiphytic orchids), some absorb water. Some parasitic epiphytes, such as mistletoe (Phorodendron sp, etc.), have roots that penetrate the host plant tissues and absorb nutrients.

Which of the following plants shows the saprotrophic mode of nutrition?

  1. Dodder

  2. Venus fly trap

  3. Nepenthes

  4. Mushroom


Correct Option: D

An obligate root parasite is 

  1. Viscum

  2. Striga

  3. Loranthus

  4. Rafflesia


Correct Option: D
Explanation:

Rafflesia is an example of the obligate root parasites. These parasites are organism which cannot complete its life cycle without a host. It is done with the help of an absorptive organ, the haustorium.

So the correct option is D.