Which cells of "Crypts of Lieberkühn" secrete antibacterial lysozyme?

1. Paneth cells

2. Zymogen cells

3. Kupffer cells

4. Argentaffin cells

Which of the following are not polymeric?

Functional megaspore in an angiosperm develops into:

Myelin sheath is produced by:

Attractants and rewards are required for:

1. Entomophily

2. Hydrophily

3. Cleistogamy

4. Anemophily

Receptor sites for neurotransmitters are present on:

1. Pre-synaptic membrane

2. Tips of axons

3. Post-synaptic membrane

4. Membrane of synaptic vesicles

Coconut fruit is a:

Adult human RBCs are enucleated. Which of the following statement(s) is/ are the most appropriate explanation for this feature? 

1. Only (a)
2. (a),(c) and (d)
3. (b) and (c)
4. Only (d)

Capacitation occurs in:

1. Epididymis

2. Vas deference

3. Female reproductive tract

4. Rete testis

Asymptote in a logistic growth curve is obtained when:

1. K = N

2. K > N

3. K < N

4. The value of 'r' approaches zero