The organelle that contains enzymes for intracellular digestion is the: MCQ with Answer and Explanation

The organelle that contains enzymes for intracellular digestion is the:
A. Peroxisome
B. Chloroplast
C. Lysosome
D. Mitochondria
Answer: Option C
Solution (By JKSSB Mock Tests)
Lysosomes are membrane-bound vesicles packed with hydrolytic enzymes (proteases, lipases, nucleases) that digest macromolecules, old organelles, and engulfed pathogens. They maintain an acidic pH (about 5.0) for optimal enzyme activity. Peroxisomes detoxify peroxides, mitochondria generate ATP, chloroplasts perform photosynthesis.

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Practice More Biology Questions

Question #1
Transpiration in plants mainly occurs through:
A. Hydathodes
B. Cuticle
C. Stomata
D. Lenticels

Correct Answer: Option C


Explanation:
Stomatal transpiration accounts for about 80-90% of total water loss from plants. Stomata are microscopic pores on leaves, surrounded by guard cells. Cuticular transpiration occurs through the cuticle but is minimal. Lenticular transpiration is through lenticels on woody stems. Hydathodes are involved in guttation, not transpiration. Transpiration creates transpiration pull essential for water ascent in xylem.

This question belongs to: Science Biology
Question #2
Assertion (A): The leaves of cacti are reduced to spines.
Reason (R): Spines reduce water loss by transpiration.
A. A true, R false.
B. A false, R true.
C. Both A and R are true, and R is the correct explanation.
D. Both A and R are true, but R is not the correct explanation.

Correct Answer: Option C


Explanation:
Cacti, xerophytes, have spiny leaves to minimize surface area and transpiration, conserving water. Thus, R correctly explains A.

This question belongs to: Science Biology
Question #3
Consider statements about genetics: 1. Genes are located on chromosomes. 2. DNA replication is semi-conservative. 3. RNA is double-stranded. Which are correct?
A. 1, 2 and 3
B. 2 and 3 only
C. 1 and 3 only
D. 1 and 2 only

Correct Answer: Option D


Explanation:
Genes are specific sequences of DNA that code for proteins or RNA, and they are arranged linearly on chromosomes within the nucleus. DNA replication is semi-conservative, meaning each newly synthesized DNA molecule consists of one original parental strand and one newly synthesized strand, as proven by the Meselson-Stahl experiment. RNA is typically single-stranded, allowing it to fold into complex shapes and perform various functions, unlike the double-stranded DNA helix. Thus, statements 1 and 2 are correct.

This question belongs to: Science Biology