The sequence of progressive, predictable changes in the species composition of a community over time is called: MCQ with Answer and Explanation

The sequence of progressive, predictable changes in the species composition of a community over time is called:
A. Biological magnification
B. Ecological succession
C. Stratification
D. Eutrophication
Answer: Option B
Solution (By JKSSB Mock Tests)
Ecological succession is the gradual and predictable process of change in the species composition of an ecological community over time. It occurs after a disturbance (secondary succession) or on a newly formed, lifeless substrate (primary succession). The final, stable community that is in near equilibrium with the environment is called the climax community. The entire sequence of communities is called a sere.

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Practice More Biology Questions

Question #1
Consider the following statements about the liver:
1. It stores glycogen.
2. It secretes bile.
3. It produces insulin.
Which of the above is/are correct?
A. 1 and 3 only
B. 1, 2, and 3
C. 1 and 2 only
D. 2 and 3 only

Correct Answer: Option C


Explanation:
The liver stores glycogen and produces bile. Insulin is produced by the beta cells of the pancreas. So 3 is incorrect.

This question belongs to: Science Biology
Question #2
The shape of a bacterial chromosome is typically:
A. Triangular
B. Linear
C. Fragmented
D. Circular

Correct Answer: Option D


Explanation:
Most bacteria possess a single circular double-stranded DNA molecule located in the nucleoid region. Some bacteria may also have linear chromosomes or multiple chromosomes, but the typical prokaryotic chromosome is circular. Eukaryotes have linear chromosomes. Plasmids are small, circular extra-chromosomal DNA in bacteria.

This question belongs to: Science Biology
Question #3
The 'Hormone Luteinizing Hormone' (LH) is secreted by the anterior pituitary. In females, the mid-cycle surge of LH directly triggers:
A. The growth of ovarian follicles
B. Menstruation
C. Ovulation and the formation of the corpus luteum
D. The thickening of the uterine lining

Correct Answer: Option C


Explanation:
Luteinizing Hormone (LH) is a gonadotropin secreted by the gonadotroph cells of the anterior pituitary. In females, during the late follicular phase, rising estrogen levels exert positive feedback on the pituitary, causing a massive, sudden surge of LH (the LH surge). This surge directly triggers ovulation (the rupture of the mature Graafian follicle and release of the secondary oocyte) and subsequently stimulates the remaining follicular cells to transform into the corpus luteum, which secretes progesterone.

This question belongs to: Science Biology