To answer this question, we need to understand the reproductive behavior of each bird species mentioned.

Option A) Partridge and ostrich - This option is correct because both partridges and ostriches lay eggs on the ground. Partridges are ground-nesting birds that typically lay their eggs in a shallow nest on the ground. Similarly, ostriches are known for their large eggs that are laid in a simple scrape on the ground.

Option B) Partridge and crow - This option is incorrect because crows do not lay their eggs on the ground. Crows are known to build their nests in trees or other elevated structures.

Option C) Ostrich and crow - This option is incorrect for the same reason mentioned above. Crows do not lay their eggs on the ground.

Option D) None of these - This option is incorrect because partridges and ostriches both lay their eggs on the ground.

Therefore, the correct answer is A) A & B. Partridges and ostriches are the bird species that lay eggs on the ground.

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To answer this question, we need to know the chemical formula for glucose. The correct chemical formula for glucose is C6H12O6.

Let's go through each option to understand why it is correct or incorrect:

Option A) C6H12O6 - This option is the correct chemical formula for glucose. It represents 6 carbon atoms, 12 hydrogen atoms, and 6 oxygen atoms, which matches the composition of glucose.

Option B) C5H10O11 - This option is incorrect. It represents 5 carbon atoms, 10 hydrogen atoms, and 11 oxygen atoms, which does not match the composition of glucose.

Option C) C12H22O11 - This option is incorrect. It represents 12 carbon atoms, 22 hydrogen atoms, and 11 oxygen atoms, which does not match the composition of glucose.

Option D) C4H8O10 - This option is incorrect. It represents 4 carbon atoms, 8 hydrogen atoms, and 10 oxygen atoms, which does not match the composition of glucose.

The correct answer is option A. The chemical formula C6H12O6 represents the correct composition of glucose.

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To determine the correct formula for chloroform, we need to understand the composition and structure of the molecule.

Chloroform is an organic compound that consists of carbon (C), hydrogen (H), and chlorine (Cl) atoms. The molecular formula for chloroform is CHCl3.

From the options provided:

A) CHCl5 - This formula has an extra chlorine atom compared to the correct formula for chloroform.

B) CH2Cl2 - This formula represents dichloromethane, which is a different compound with a different structure.

C) CHCl3 - This is the correct formula for chloroform.

D) CCl4 - This formula represents carbon tetrachloride, which is a different compound with a different structure.

Therefore, the correct answer is C) CHCl3.

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To answer this question, we need to identify the name of the organic compound C6H6OH.

The correct answer is D) All of the above.

Explanation: C6H6OH is the molecular formula for a compound known as phenol, which can also be represented as Catechol, Hydroquinone, or Resorcinol.

Phenol is a colorless crystalline solid that is commonly used in the production of plastics, pharmaceuticals, and disinfectants. It is also used as an antiseptic and anesthetic in certain medical procedures.

Therefore, all of the options A) catechol, B) hydroquinone, and C) resorcinol are correct names for the organic compound C6H6OH.

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