Q: Where do rays enter the eye?
Options:
- (A) glass
- (B) Summer
- (C) pupil
- (D) lenses
- (E) harmful
- (F) the sun
- (G) photons
- (H) skin
A: So, my chain of thought: Light enters the eye through an opening called the pupil. Light rays are focussed on the retina. When rays are shined at the eyes, they enter an opening called the pupil. The answer is (C).

Q: What kind of worm belongs to the phylum platyhelminthes?
Options:
- (A) homogenous
- (B) moves
- (C) dangerous
- (D) insects
- (E) tapeworm
- (F) parasites
- (G) white
- (H) graptolites
A: So, my chain of thought: Flatworms belong to the phylum Platyhelminthes. Flatworms Flatworms or Platyhelminthes include flukes, tapeworms, and turbellarians. Tapeworms belong to the phylum Platyhelminthes. The answer is (E).

Q: What are chromosomes made of?
Options:
- (A) Deoxyribonucleicacid, protein
- (B) sulfuric acid, fat
- (C) Chemical energy
- (D) protein, hydrobromic acid
- (E) boric acid, protein
- (F) Something that comes in a bundle of fibers
- (G) sub-units of species
- (H) A compound that donates proton
A:
So, my chain of thought: Chromosomes are coiled structures made of DNA and proteins. DNA stands for Deoxyribonucleicacid. Chromosomes are coiled structures made of Deoxyribonucleicacid and proteins. The answer is (A).