NEET Practice Questions (MCQs) with Answers & Solutions

An inflorescence is a group or cluster of flowers arranged on a stem. When the flowers of an inflorescence mature and form fruit, they typically form a multiple or composite fruit. This is because the fruit develops from the ovaries of multiple flowers.

Raceme is a type of inflorescence where flowers are borne on short stalks along the main axis. Wheat, however, does not have a raceme inflorescence; it has a spike inflorescence. Thus, the pair Raceme – Wheat is not correct.

The correct pairing for compound umbel is found in plants like 'Apiaceae' family (e.g., coriander, fennel, etc.), not onion. So, option o3 is the incorrect pairing.

The correct pairs are: (a)- (r)- IV (Unilocular Ovary - One Chamber - Sunflower), (b)- (s)-I (Bilocular Ovary - Two Chamber - Petunia), (c)- (q)- II (Trilocular Ovary - Three Chamber - Asparagus), (d)- (p)-III (Pentalocular Ovary - Five Chamber - Hibiscus).

The correct matchings are: (P)- IV (Marginal Placentation - Pea), (Q) – I (Axial Placentation - Petunia), (R)-II (Free central Placentation - Dianthus), (S)-III (Parietal Placentation - Mustard). This is based on the typical placentation found in these plants.

In botany, specific plants have unique adaptations. Loranthus is a partial stem parasite, Pothos has clinging roots, Tinospora has assimilatory roots, and Cuscuta is a total stem parasite. Thus, matching these correctly:
P. Total stem parasite - IV Cuscuta
Q. Assimilatory root - III Tinospora
R. Clinging root - II Pothos
S. Partial parasite - I Loranthus
The correct sequence is P Q R S IV III II I.

Marginal placentation is when the placenta forms a ridge along the ventral suture of the ovary and the ovules are borne on this ridge forming two rows. This is commonly seen in legumes such as peas.

Zn2+ is an activator of alcohol dehydrogenase 

mo is an activator of nitrogenase 

mg is present in chrophyll 

P is a constituent of ATP

Both statements are true, but the reason does not directly explain the statement. Leaves do prepare food through photosynthesis (S), and they also facilitate gas exchange for respiration (R). However, gas exchange is not the reason why leaves perform photosynthesis.