Following are given four statements $\left(i\right)-\left(iv\right)$ related to frog. Read the statements carefully and select the option that identifies two correct statements.
(i) The brain is divided into fore-brain, mid-brain and hind-brain.
(ii) Vasa efferentia enter the kidneys on their side and open into Bidder's canal.
(iii) Ear acts as a hearing organ only.
(iv) RBC's are enucleated and contain red coloured pigment namely haemoglobin.

Refer to the given figures showing two types of glands.

Which of the following statements regarding these glands is not correct?

Read the following statements regarding different types of animal tissues and select the incorrect ones.

(i) Each fasciculus (or bundle of muscle fibres) is surrounded by an epithelial tissue covering called perimysium.
(ii) Multi unit smooth muscles are present in ciliary and iris muscles in the eyes and muscles of the walls of large blood vessels.
(iii) Columnar epithelium present in gastric glands, intestinal glands and pancreatic lobules, has a secretory role and is called as glandular epithelium.
(iv) Epithelial tissue arises only from the ectoderm of embryo and is usually supplied with blood vessels.

Enzyme collagenase breaks the peptide bonds present in collagen protein. Excessive secretion of this enzyme will lead to weakening of which of the following body parts?

(i) Tendons
(ii) Bones
(iii) Hair shafts
(iv) Nails and claws
(v) Intervertebral discs

Refer to the given figure showing reproductive system of female cockroach.

Identify the parts labelled as $P, Q, R$ and $S$ and select the correct statement regarding these.