The pigment that is found in red algae and helps in deep-water photosynthesis is:
A. Fucoxanthin
B. Phycoerythrin
C. Carotenoid
D. Chlorophyll b
Answer: Option B
Solution (By JKExamLibrary)
Phycoerythrin absorbs blue-green light, which penetrates deeper water, allowing red algae to photosynthesize at greater depths. Fucoxanthin is in brown algae, chlorophyll b green, carotenoids orange.
Explanation:
Transcription, catalyzed by RNA polymerase, copies the genetic information from a DNA template into a complementary mRNA strand. Translation is protein synthesis.
Explanation:
The pyramid of energy is always upright because of the 10% law of energy transfer. As energy flows from one trophic level to the next, a large portion (about 90%) is lost as heat due to metabolic processes (respiration). Only about 10% is transferred to the next level. Therefore, the total energy content always decreases at higher trophic levels, making an inverted pyramid of energy impossible.
Assertion (A): Lysosomes are known as the 'suicidal bags' of the cell.
Reason (R): They contain hydrolytic enzymes that can digest the cell’s own components.
A.A false, R true.
B.A true, R false.
C.Both A and R are true, and R is the correct explanation.
D.Both A and R are true, but R is not the correct explanation.
Explanation:
Lysosomes are membrane-bound vesicles containing powerful hydrolytic enzymes. When they burst, they can digest cellular components, leading to autolysis. Hence, they are called suicidal bags. The reason correctly explains the assertion.
No comments yet. Be the first to start the discussion!