In an ecological food chain, the 10% law of energy transfer implies that if producers fix 10,000 kcal of energy, the energy available to the tertiary consumers will be: MCQ with Answer and Explanation
In an ecological food chain, the 10% law of energy transfer implies that if producers fix 10,000 kcal of energy, the energy available to the tertiary consumers will be:
A. 1 kcal
B. 1,000 kcal
C. 100 kcal
D. 10 kcal
Answer: Option D
Solution (By JKExamLibrary)
According to Lindeman's 10% law, only about 10% of the energy from one trophic level is transferred to the next; the rest is lost as heat through respiration. Producers (Trophic Level 1) have 10,000 kcal. Primary consumers (Level 2) get 10% of 10,000 = 1,000 kcal. Secondary consumers (Level 3) get 10% of 1,000 = 100 kcal. Tertiary consumers (Level 4) get 10% of 100 = 10 kcal.
Consider statements about cell biology: 1. The cell membrane is selectively permeable. 2. The nucleus contains genetic material. 3. Mitochondria are the site of photosynthesis. Which are correct?
Explanation:
The cell membrane (plasma membrane) is selectively permeable, regulating the passage of substances in and out of the cell to maintain internal homeostasis. The nucleus is the membrane-bound organelle that houses the cell's genetic material (DNA) organized into chromosomes, directing cellular activities. Mitochondria are the site of aerobic cellular respiration and ATP production; chloroplasts are the organelles where photosynthesis occurs in plant cells. Thus, statements 1 and 2 are correct.
Explanation:
Double fertilization in angiosperms was discovered by the Russian botanist Sergei Nawaschin in 1898 in Lilium and Fritillaria. One male gamete fuses with the egg to form the zygote, the other with the secondary nucleus to form the triploid endosperm. Strasburger discovered fertilization in flowering plants, Amici observed pollen tube, Hofmeister studied alternation of generations.
Explanation:
Musca domestica is the common housefly, a dipteran insect. Periplaneta americana is the American cockroach, Drosophila melanogaster is the fruit fly used in genetics, Apis indica is the Indian honeybee. Housefly can act as a mechanical vector for diseases like typhoid, cholera. Scientific names help precise identification.
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