The causative agent of ergotism, a disease affecting rye and other cereals, is: MCQ with Answer and Explanation

The causative agent of ergotism, a disease affecting rye and other cereals, is:
A. Ustilago maydis
B. Claviceps purpurea
C. Alternaria solani
D. Puccinia graminis
Answer: Option B
Solution (By JKSSB Mock Tests)
Ergotism is caused by the fungus Claviceps purpurea, which infects the ovaries of rye and other grasses, replacing the seeds with hard, dark sclerotia (ergots). These sclerotia contain potent alkaloids (like ergotamine) that cause severe vasoconstriction and neurological symptoms in humans and animals consuming contaminated grain. Ustilago causes smut, and Puccinia causes rust.

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Practice More Biology Questions

Question #1
The jelly-like substance that fills the cell and holds organelles is the:
A. Cytoplasm
B. Protoplasm
C. Nucleoplasm
D. Matrix

Correct Answer: Option A


Explanation:
Cytoplasm is the semifluid material between the plasma membrane and the nucleus, composed of cytosol, organelles, and inclusions. It is the site of many metabolic reactions. Nucleoplasm is inside the nucleus, protoplasm includes cytoplasm and nucleoplasm, and matrix refers to the inner compartment of mitochondria.

This question belongs to: Science Biology
Question #2
Consider statements about biotechnology: 1. Genetic engineering involves altering an organism's DNA. 2. Cloning creates an exact genetic copy. 3. Tissue culture is used for plant propagation. Which are correct?
A. 2 and 3 only
B. 1 and 2 only
C. 1 and 3 only
D. 1, 2 and 3

Correct Answer: Option D


Explanation:
Genetic engineering (recombinant DNA technology) involves the direct manipulation of an organism's genes using biotechnology to alter its characteristics. Cloning is the process of producing genetically identical copies of a biological entity, such as a gene, cell, or entire organism. Tissue culture (micropropagation) is a technique used to grow plant cells, tissues, or organs in a sterile nutrient medium, allowing for the rapid, large-scale propagation of plants from a small explant. All statements are correct.

This question belongs to: Science Biology
Question #3
Which part of the flower develops into fruit?
A. Ovule
B. Ovary
C. Petal
D. Anther

Correct Answer: Option B


Explanation:
After fertilization, the ovary of the flower develops into fruit, while the ovule develops into seed. The ovary wall becomes the pericarp (fruit wall). Petals, sepals, and stamens usually wither. Some fruits are parthenocarpic (without fertilization, e.g., banana). The fruit protects seeds and aids in dispersal. Anther produces pollen grains. Thus, fruit is a mature ovary.

This question belongs to: Science Biology