Question

1.
Which of the following organisms take the food by parasitic nutrition?
(ii) Mushrooms (iii) Cuscuta
(iv) Leeches
A) (i), (ii)
B) (iii)
C)(iii), (iv)
D) (1)
(i) Yeast​

Answer 1

Correct Question:

Which of the following organisms take food by parasitic nutrition?

i) Yeast  ii) Mushrooms  iii) Cuscuta  iv) Leeches

A) i and ii

B) iii

C) iii and iv

D) iv

Answer:

Option C: iii and iv

Explanation:

From the given options Cuscuta and Leeches show parasitic form of nutrition.

→ Cuscuta - Cuscuta is a parasitic plant. It does contain any chlorophyll and is yellow in colour. This parasite grows onto other plants which are referred to as hosts and absorb their nutrition thus weakening and reducing the growth of the host. In agricultural fields, cuscuta is considered as a very harmful weed and specific weedicides are used to kill it.

→ Leeches - Leech is a parasitic animal. It is found is shallow freshwater as well as highly wet muddy soil. Once they find any type of flesh [that belongs to the host organism], they attach themselves to the host and sûcks blood until they have fed themselves and then falls to the ground.

But leeches has been used for medical purposes such as a cure of certain diseases since ancient times. These leeches are found in all continents except Antarctica.

Exploring the Other Options:

i) Yeast

Yeast is a single-celled fungi and show saprotrophic mode of nutrition. They grow on dead and decaying matter absorbing nutrients and energy from it.

ii) Mushrooms

Mushrooms also belong to the kingdom of fungi and show saprotrophic mode of nutrition. The grow on dead and decaying plants and absorb them as nutrients for growth.