Which of the following is a macronutrient for plants? MCQ with Answer and Explanation

Which of the following is a macronutrient for plants?
A. Phosphorus
B. Iron
C. Copper
D. Zinc
Answer: Option A
Solution (By JKSSB Mock Tests)
Phosphorus is a primary macronutrient (along with nitrogen and potassium) required in relatively large amounts for nucleic acids, ATP, and phospholipids. Iron, zinc, and copper are micronutrients needed in trace amounts. Macronutrients include C, H, O, N, P, K, Ca, Mg, S. Micronutrients function as enzyme cofactors.

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Practice More Biology Questions

Question #1
The class of vertebrates that have a four-chambered heart and are endothermic is:
A. Amphibia
B. Reptilia
C. Aves and Mammalia
D. Pisces

Correct Answer: Option C


Explanation:
Birds (Aves) and mammals (Mammalia) are endothermic (warm-blooded) and possess a four-chambered heart, allowing complete separation of oxygenated and deoxygenated blood. Amphibians have a three-chambered heart, reptiles mostly three-chambered (except crocodilians), fish two-chambered. This allows high metabolic rates.

This question belongs to: Science Biology
Question #2
The organelle involved in lipid metabolism and detoxification is:
A. Golgi apparatus
B. Rough ER
C. Lysosome
D. Smooth ER

Correct Answer: Option D


Explanation:
Smooth endoplasmic reticulum (SER) lacks ribosomes and is involved in synthesis of lipids, steroid hormones, and detoxification of drugs and toxins via cytochrome P450 enzymes. Rough ER is for protein synthesis, Golgi for packaging, lysosomes for digestion. SER is abundant in liver and gonadal cells.

This question belongs to: Science Biology
Question #3
The organelle that contains its own DNA and ribosomes and is involved in apoptosis is the:
A. Lysosome
B. Endoplasmic reticulum
C. Peroxisome
D. Mitochondria

Correct Answer: Option D


Explanation:
Mitochondria release cytochrome c and other factors that activate caspases, initiating apoptosis. They have circular DNA and 70S ribosomes.

This question belongs to: Science Biology