Submerged aquatic plants – a threat to paddy cultivation.

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News: Aquatic weeds submerged in water are posing a threat to paddy cultivation in the state of Tamil Nadu. Read The News Here.

Let’s Understand from UPSC Perspective:

The weeds posing threat to paddy cultivation include plants like vallisneria, najas, and utricularia.

Vallisneria: Vallisneria is commonly called the eel grass or tape grass. It is the most commonly found aquatic weed plant It was introduced as an ornamental aquarium plant in India. The genus is widely distributed in tropical and subtropical regions of Asia, Africa, Europe, and North America. In Malayalam, it is known as thalayattippullu, vazhakala and mudipayal. ( These names become important because UPSC has the habit of asking local names in prelim exams).

Najas: Najas are commonly known as rice field water-nymph, a species of aquatic plant found in freshwater habitats, especially still or slow-moving waters, like ponds and in rice fields. It grows to a maximum length of 30 cm. The flowers are monoecious. The flowering season is from July to September.

Utricularia: Utricularia, a carnivorous aquatic plant, is now common in rice fields, but the problem is more severe in the second crop season.

Questions related to the topic:

Q. Describe the management of the paddy-wheat cropping system having a forecast of poor rain.

Which of the following is Kharif Crop?

a. Groundnut

b. Maize

c. Paddy

d. All of the above

Ans. d

What is/are the advantage/advantages of zero tillage in agriculture? 1. Sowing of wheat is possible without burning the residue of the previous crops

2. Without the need for the nursery of rice saplings, direct planting of paddy seeds in the wet soil is possible. 

3. Carbon sequestration in the soil is possible. Select the correct answer using the code given below: 

(a) 1 and 2 only 

(b) 2 and 3 only 

(c) 3 only 

(d) 1, 2 and 3

Answer: d

India is the ………..largest producer of rice in the world.

A. First
B. Second
C. Third
D. Fourth

Answer: B

If rice is a commercial crop in Haryana and Punjab, in which state is it a subsistence crop?

A. Madhya Pradesh
B. Maharashtra
C. Odisha
D. Rajasthan

Answer: C

Rice requires high humidity with …….cm annual rainfall?

A. above 100 cm
B. Below 100 cm
C. Above 75 cm
DA. Above 60 cm

Answer: A

How has it become possible to grow rice in areas of less rainfall such as Punjab, Haryana and western Uttar Pradesh, and parts of Rajasthan?

A. With rooftop water reserves
B. Canals
C. lakes
D. Rivers

Answer: B

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