NEET 2017 question paper with solutions

1. Recall the historical timeline of Mendel's work. Gregor Mendel carried out his famous hybridisation experiments on garden pea plants over a specific span of years, carefully observing how traits were passed from parents to offspring.

2. Identify the correct time period. These experiments are historically recorded as having been conducted between the years 1856 and 1863, during which Mendel developed the foundational Laws of Inheritance.

3. Eliminate the other options. The other listed time ranges do not correspond to the actual historical period of Mendel's documented experimental work.

Hence, the correct answer is Option D, 1856 – 1863.

1. Recall which enzymes belong to which digestive juice. The digestive system produces different juices at different locations, each containing a specific set of enzymes, so identifying which enzymes belong specifically to pancreatic juice is key here.

2. List the correct pancreatic enzymes. Pancreatic juice contains enzymes such as lipase (digests fats), amylase (digests starch), trypsinogen (inactive precursor of the protein-digesting enzyme trypsin), and procarboxypeptidase (inactive precursor of carboxypeptidase).

3. Eliminate options containing gastric enzymes. Pepsin and rennin are enzymes found in gastric juice (secreted by the stomach), not pancreatic juice. Since options A, B, and D all include either pepsin or rennin, they are incorrect.

4. Eliminate options containing intestinal enzymes. Maltase is an enzyme found in the intestinal juice, not pancreatic juice, so option A is further ruled out on this basis too.

5. Conclusion. Since option C contains only enzymes genuinely secreted in pancreatic juice, the correct answer is Option C: Lipase, Amylase, Trypsinogen, Procarboxypeptidase.

1. Recall the total number of ribs in humans.

Humans have 12 pairs of ribs in total, so X = 12.

2. Recall which ribs are considered "true ribs."

Out of these, only the 1st to 7th pairs (7 pairs) are classified as true ribs, so Y = 7.

3. Recall the attachment pattern of true ribs.

True ribs are attached dorsally to the vertebral column and ventrally directly to the sternum, forming a complete connection on both ends.

4. Match with the given options.

This matches X=12, Y=7, with the correct description of dorsal attachment to the vertebral column and ventral attachment to the sternum.

Hence, the answer is Option D.