Glyoxysomes are specialized organelles found primarily in: MCQ with Answer and Explanation

Glyoxysomes are specialized organelles found primarily in:
A. Mature plant leaves
B. Germinating oil seeds
C. Animal liver cells
D. Fungal spores
Answer: Option B
Solution (By JKSSB Mock Tests)
Glyoxysomes are specialized peroxisomes found in the fat-storing cotyledons of germinating seeds. They contain enzymes for the beta-oxidation of fatty acids and the glyoxylate cycle, which converts stored lipids into carbohydrates (gluconeogenesis) to nourish the growing seedling. This metabolic pathway is absent in animal cells. Exam tip: Glyoxysomes eventually transform into chloroplasts as the plant matures.

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Practice More Biology Questions

Question #1
The gland that produces tears is the:
A. Ceruminous gland
B. Parotid gland
C. Lacrimal gland
D. Sublingual gland

Correct Answer: Option C


Explanation:
Lacrimal glands, located above the outer corner of each eye, produce tears that lubricate and protect the eye surface. Parotid and sublingual are salivary glands, ceruminous glands produce ear wax.

This question belongs to: Science Biology
Question #2
The element that is essential for the synthesis of auxin in plants is:
A. Copper
B. Manganese
C. Iron
D. Zinc

Correct Answer: Option D


Explanation:
Zinc is a micronutrient that acts as a cofactor for tryptophan synthetase, an enzyme involved in the biosynthesis of the auxin indole-3-acetic acid (IAA) from tryptophan. Zinc deficiency causes stunted growth and 'little leaf' disease. Iron is for chlorophyll synthesis, copper for enzymes, manganese for photosystem II.

This question belongs to: Science Biology
Question #3
Archaeopteryx is considered a connecting link between:
A. Birds and mammals
B. Fish and amphibians
C. Reptiles and birds
D. Reptiles and mammals

Correct Answer: Option C


Explanation:
Archaeopteryx is a famous fossil that exhibits characteristics of both reptiles and birds, making it a classic connecting link. It had reptilian features like teeth, a long bony tail, and clawed fingers, but also avian features like feathers, wings, and a bird-like beak. It provides strong evidence for the evolutionary theory that birds evolved from theropod dinosaurs.

This question belongs to: Science Biology