Q71
Melanin protects from
Correct Answer
Option B
Solution
Melanin pigment in skin protects from harmful UV rays. People in tropics have more melanin as adaptation.
Structural Organisation in Animals
Q72
Collagen is
Correct Answer
Option B
Solution
Collagen is a major fibrous protein of connective tissue occurring as white fibres produced by fibroblasts.
Q73
Which correctly described the location of some body parts in earthworm Pheretima?
Correct Answer
Option A
Solution
Two pairs of testis sacs in Pheretima are situated in the 10th and 11th segments.
Q74
Which is correct pairing of body part and kind of muscle tissue that moves it?
Correct Answer
Option B
Solution
The iris contains involuntary smooth muscle controlling pupil dilation/constriction.
Q75
The cell junctions called tight, adhering and gap junctions are found in
Correct Answer
Option C
Solution
Epithelial tissue cells are held together by tight, adhering and gap junctions.
Q76
Which one of the following is the true description about an animal?
Correct Answer
Option D
Solution
Cockroach has 10 pairs of spiracles: 2 thoracic (mesothoracic, metathoracic) and 8 abdominal pairs.
Q77
Earthworms have no skeleton but during burrowing the anterior end becomes turgid because of
Correct Answer
Option A
Solution
Coelomic fluid (alkaline milky fluid) fills the coelom making the anterior end turgid, acting as a hydraulic skeleton.
Q78
Which pair of structures distinguishes a nerve cell from other types of cell?
Correct Answer
Option A
Solution
Perikaryon and dendrites are unique to nerve cells.
Q79
In which preparation are you likely to come across cell junctions most frequently?
Correct Answer
Option D
Solution
Ciliated epithelium cells are closely packed with frequent intercellular junctions.
Q80
Earthworms are
Correct Answer
Option B
Solution
Earthworm excretes ammonia when water is available (ammonotelic) and urea when on land (ureotelic).
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