In animal husbandry, 'composite fish culture' is a technique used in inland fisheries where: MCQ with Answer and Explanation

Question

In animal husbandry, 'composite fish culture' is a technique used in inland fisheries where:

A. Only one species of fish is reared at a very high density

B. Fish and prawns are reared together exclusively

C. Fish are reared in the ocean cages

D. A combination of five or six different fish species with different feeding habits are reared together in a single pond

Answer: Option D

Solution (By JKExamLibrary)

Composite fish culture is a highly productive system used in inland fisheries (ponds) in India. It involves stocking a single pond with a combination of 5-6 different indigenous and exotic fish species that have complementary feeding habits (e.g., Catla are surface feeders, Rohu are column feeders, Mrigal and Common Carp are bottom feeders). This ensures that all available food resources in the different zones of the pond are utilized efficiently without interspecific competition, maximizing total yield.

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Question #1

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Consider statements about leaves: 1. The flat part is called the lamina. 2. Stomata are more abundant on the upper epidermis in dicots. 3. The petiole attaches the leaf to the stem. Which are correct?

A. 1 and 2 only

B. 1, 2 and 3

C. 2 and 3 only

D. 1 and 3 only

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Correct Answer: Option D

Explanation:
A typical leaf consists of the leaf base, petiole (stalk), and lamina (leaf blade). In dicotyledonous leaves, stomata are generally more abundant on the lower epidermis to reduce excessive water loss from direct sunlight, unlike monocots where they may be equal. Therefore, statements 1 and 3 are correct, while statement 2 is incorrect.

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Question #2

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The release of ovum from the ovary is called:

A. Fertilization

B. Ovulation

C. Menstruation

D. Implantation

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Correct Answer: Option B

Explanation:
Ovulation is the process where a mature ovum (secondary oocyte) is released from the Graafian follicle of the ovary, typically around day 14 of the menstrual cycle, triggered by the LH surge. The ovum is captured by the fimbriae of the fallopian tube. Fertilization is fusion with sperm, menstruation is shedding of the uterine lining, implantation is embedding of the blastocyst.

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Question #3

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Phenylketonuria (PKU) is an example of:

A. Polygenic inheritance

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Correct Answer: Option B

Explanation:
Pleiotropy is a phenomenon where a single gene influences multiple, seemingly unrelated phenotypic traits. Phenylketonuria (PKU) is an autosomal recessive metabolic disorder caused by a mutation in a single gene (PAH) that codes for the enzyme phenylalanine hydroxylase. This single mutation leads to multiple effects: intellectual disability, reduced hair and skin pigmentation, and musty odor.

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