Consider statements about animal husbandry: 1. Poultry birds are reared for meat and eggs. 2. Dairy animals are reared for milk production. 3. Sericulture involves rearing honeybees. Which are correct? MCQ with Answer and Explanation

Consider statements about animal husbandry: 1. Poultry birds are reared for meat and eggs. 2. Dairy animals are reared for milk production. 3. Sericulture involves rearing honeybees. Which are correct?
A. 2 and 3 only
B. 1, 2 and 3
C. 1 and 2 only
D. 1 and 3 only
Answer: Option C
Solution (By JKSSB Mock Tests)
Poultry farming involves the commercial rearing of birds, primarily chickens, for the production of meat (broilers) and eggs (layers). Dairy farming focuses on the breeding, rearing, and management of cattle, buffaloes, and other mammals for the production of milk and milk products. Sericulture is the rearing of silkworms (Bombyx mori) for silk production; the rearing of honeybees is called apiculture. Thus, statements 1 and 2 are correct.

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Question #1
Crossing over occurs between:
A. Two different cells
B. Sister chromatids of the same chromosome
C. Non-sister chromatids of homologous chromosomes
D. Non-homologous chromosomes

Correct Answer: Option C


Explanation:
Crossing over is the exchange of genetic material between non-sister chromatids of homologous chromosomes during prophase I of meiosis. This leads to genetic recombination. Sister chromatid exchange does occur but crossing over specifically refers to the exchange between homologues.

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Question #2
In a plant cell, the turgor pressure is maintained mainly by the:
A. Chloroplast
B. Central vacuole
C. Plasma membrane
D. Cell wall

Correct Answer: Option B


Explanation:
The central vacuole occupies a large volume of a mature plant cell and stores water, creating turgor pressure against the cell wall, which maintains cell rigidity and plant structure. The cell wall provides mechanical support but turgor pressure generated by the vacuole is essential for maintaining turgidity, especially in herbaceous plants.

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Question #3
Which of the following is an example of an insectivorous plant?
A. Cuscuta
B. Monotropa
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D. Rhizobium

Correct Answer: Option C


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Drosera (sundew) is an insectivorous plant that captures insects with sticky tentacles on leaves to supplement nitrogen in nutrient-poor soils. Cuscuta is a parasitic plant, Monotropa is saprophytic, Rhizobium is a bacterium, not a plant. Insectivorous plants include pitcher plant (Nepenthes), Venus flytrap, and bladderwort. They are autotrophic but supplement nitrogen.

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