In the context of human diseases, 'Elephantiasis' is caused by the filarial worm Wuchereria bancrofti, which is transmitted by the bite of the female: MCQ with Answer and Explanation

In the context of human diseases, 'Elephantiasis' is caused by the filarial worm Wuchereria bancrofti, which is transmitted by the bite of the female:
A. Anopheles mosquito
B. Tsetse fly
C. Culex mosquito
D. Aedes mosquito
Answer: Option C
Solution (By JKSSB Mock Tests)
Lymphatic filariasis, commonly known as elephantiasis, is a parasitic disease caused by nematode worms, primarily Wuchereria bancrofti. The infective larvae (microfilariae) are transmitted to humans through the bite of an infected female Culex mosquito (primarily Culex pipiens fatigans). The adult worms lodge in the lymphatic vessels, causing severe inflammation, blockage, and the characteristic massive swelling (elephantiasis) of the limbs and genitals. Anopheles transmits malaria, Aedes transmits dengue.

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Practice More Biology Questions

Question #1
The plant hormone that promotes seed germination by breaking dormancy is:
A. Gibberellin
B. Abscisic acid
C. Auxin
D. Ethylene

Correct Answer: Option A


Explanation:
Gibberellins stimulate the synthesis of hydrolytic enzymes (e.g., amylase) that mobilize stored food reserves, promoting germination. Abscisic acid induces and maintains dormancy. Ethylene promotes ripening, auxin cell elongation.

This question belongs to: Science Biology
Question #2
Which scientist first observed and described living cells?
A. Robert Hooke
B. Antonie van Leeuwenhoek
C. Matthias Schleiden
D. Rudolf Virchow

Correct Answer: Option B


Explanation:
Antonie van Leeuwenhoek, a Dutch microscopist, designed single-lens microscopes and observed bacteria, protozoa, sperm cells, and RBCs for the first time, calling them 'animalcules'. Hooke observed dead cork cells. Schleiden proposed that plants are composed of cells, Virchow stated 'Omnis cellula e cellula'. Leeuwenhoek is rightly considered the father of microbiology for his pioneering observations of living microbes.

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Question #3
In plant physiology, the 'Imbibition' is a special type of diffusion where water is absorbed by solid particles (colloids), causing them to increase in volume. This process is crucial for:
A. The translocation of sugars in the phloem
B. The opening and closing of stomata
C. The ascent of sap in tall trees
D. The initial absorption of water by dry seeds, leading to germination

Correct Answer: Option D


Explanation:
Imbibition is a physical process where solid, hydrophilic (water-loving) colloidal materials (like cellulose, pectin, proteins, and starch) adsorb water, causing a tremendous increase in their volume and generating significant imbibitional pressure. This process is the very first step in seed germination. When a dry seed is exposed to water, its cell walls and storage materials imbibe water, causing the seed to swell, rupturing the seed coat, and initiating the metabolic activities required for the seedling to grow. It is also responsible for the splitting of rocks by plant roots.

This question belongs to: Science Biology