Which of the following is a vascular cryptogam? MCQ with Answer and Explanation

Question
Which of the following is a vascular cryptogam?
A. Pinus
B. Selaginella
C. Marchantia
D. Funaria
Answer: Option B
Solution (By JKExamLibrary)
Vascular cryptogams are plants that possess vascular tissues (xylem and phloem) but reproduce via spores rather than seeds. Pteridophytes, such as Selaginella (spike moss), ferns, and Equisetum, fit this description. Funaria and Marchantia are bryophytes (non-vascular cryptogams), and Pinus is a gymnosperm (a vascular phanerogam or seed-producing plant).
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Question #1
The type of immunity that occurs after recovery from an infection is:
A. Artificial active immunity
B. Natural passive immunity
C. Natural active immunity
D. Artificial passive immunity
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Correct Answer: Option C

Explanation:
Natural active immunity develops when a person is exposed to a live pathogen, develops an immune response, and creates memory cells. Artificial active is from vaccination. Passive immunity involves receiving antibodies.
This question belongs to: Science Biology
Question #2
The hormone that promotes the development of the mammary glands during pregnancy is:
A. Estrogen
B. Oxytocin
C. Prolactin
D. Progesterone
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Correct Answer: Option D

Explanation:
Progesterone stimulates the development of alveolar tissue of the breasts during pregnancy. Estrogen promotes duct development. Prolactin initiates milk synthesis, oxytocin ejection.
This question belongs to: Science Biology
Question #3
Consider statements about human immunity: 1. Innate immunity is present from birth. 2. Acquired immunity develops after exposure. 3. Vaccines provide natural immunity. Which are correct?
A. 1 and 2 only
B. 1 and 3 only
C. 1, 2 and 3
D. 2 and 3 only
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Correct Answer: Option A

Explanation:
Innate (natural) immunity is the non-specific defense mechanism present from birth, including physical barriers like skin and chemical barriers like stomach acid. Acquired (adaptive) immunity is highly specific and develops after the body is exposed to a specific pathogen or antigen, involving the production of antibodies and memory cells. Vaccines provide artificial immunity (specifically, artificial active immunity), not natural immunity, which is acquired through actual infection or from mother to child. Thus, statements 1 and 2 are correct.
This question belongs to: Science Biology
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