Biology Aptitude Test for Class 11 on “Animals – Organs and Organ System – 2”.
1. Which class do the cockroaches belong to?
a) Class Insecta
b) Class Chitoptera
c) Class Arachnida
d) Class Diplotera
Answer: a
Clarification: Cockroaches are brown or black bodied animals that are included in class Insecta of Phylum Arthropoda. Bright yellow, red and green coloured cockroaches have been reported in tropical regions.
2. Where do the cockroaches generally live?
a) In moist places
b) In dry places
c) In damp places
d) In bright spaces
Answer: c
Clarification: Cockroaches are nocturnal omnivores that live in damp places throughout the world. They have become residents of human homes and thus are serious pests and vectors of several diseases.
3. In how many segments is the body of cockroach divided?
a) One
b) Two
c) Three
d) Four
Answer: c
Clarification: The body of the cockroach is segmented and divisible into three distinct regions- head, thorax and abdomen. The entire body is covered by a hard chitinous exoskeleton which is brown.
4. Which of the following is not included in the mouthparts of the cockroaches?
a) Collateral glands
b) Maxilla
c) Mandible
d) Hypopharynx
Answer: a
Clarification: The mouth-parts of the cockroach consist of a labrum (upper lip), a pair of mandibles, a pair of maxillae and a labium (lower lip). A median flexible lobe acts as a tongue, which is also known as hypopharynx.
5. Ventral sclerites are known as tergites and dorsal sclerites are known as sternites.
a) True
b) False
Answer: b
Clarification: In each segment of the cockroach, the exoskeleton has hardened plates called sclerites that are joined to each other by a thin and flexible articular membrane. Dorsal sclerites are known as tergites and ventral sclerites are known as sternites respectively.
6. Which of the following segments is not involved in the formation of a genital pouch in male cockroaches?
a) 7th sternum
b) 9th tergum
c) 10th tergum
d) 9th sternum
Answer: a
Clarification: 7th sternum is not involved in the formation of the genital pouch in the male cockroaches. Their genital pouch is a chamber which lies at the hind end of the abdomen. The genital chamber is bounded dorsally by 9th and 10th terga and ventrally by 9th sternum. It contains dorsal anus, ventral male genital pore and gonapophysis. It is also surrounded by some phallomeres.
7. How many chitinous teeth are present in the gizzard of cockroaches?
a) Seven
b) Two
c) Eleven
d) Six
Answer: d
Clarification: Gizzard or proventriculus has an outer layer of thick circular muscles and thick inner cuticle forming six highly chitinous plate called teeth. Gizzard helps in grinding the food particles.
8. What is the function of the part labelled as a question mark in the given diagram?
a) Respiration
b) Circulation
c) Excretion
d) Reproduction
Answer: c
Clarification: The question mark in the given figure represents the Malpighian tubules. They are present at the junction of midgut and hindgut and are 100-150 in number. They help in removal of excretory products from haemolymph, thus they help in excretion. The correct labelling of the diagram is as shown below:
