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

Question
Which of the following is a macronutrient for plants?
A. Phosphorus
B. Copper
C. Zinc
D. Iron
Answer: Option A
Solution (By JKExamLibrary)
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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Question #1
The scientist who proved that microorganisms cause disease was:
A. Robert Koch
B. Antonie van Leeuwenhoek
C. Louis Pasteur
D. Joseph Lister
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Correct Answer: Option A

Explanation:
Robert Koch established Koch's postulates, demonstrating that specific microbes cause specific diseases (anthrax, tuberculosis, cholera).
This question belongs to: Science Biology
Question #2
Which of the following is an example of a connective tissue?
A. Neuron
B. Epidermis
C. Smooth muscle
D. Blood
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Correct Answer: Option D

Explanation:
Blood is a fluid connective tissue. Epidermis is epithelial tissue, neuron is part of nervous tissue, smooth muscle is muscle tissue. Connective tissues include bone, cartilage, blood, adipose tissue, and areolar tissue, characterized by cells embedded in a matrix. They provide support, protection, and transport.
This question belongs to: Science Biology
Question #3
Consider the following statements about the heart:
1. The SA node is the natural pacemaker.
2. The AV node delays the impulse before it passes to ventricles.
3. The Purkinje fibers conduct impulses through the ventricular walls.
Which of the above is/are correct?
A. 1, 2, and 3
B. 1 and 2 only
C. 1 and 3 only
D. 2 and 3 only
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Correct Answer: Option A

Explanation:
All three are correct: SA node initiates impulse, AV node delays it to allow atrial emptying, Purkinje fibers spread impulse through ventricles.
This question belongs to: Science Biology
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