NEET Biology Cockroach MCQs Set 02

Answer: (d) Haemocoel

Explanation:
1. The coelom is reduced and the body cavity is filled with blood, so it is a haemocoel.
2. It is divided into sinuses by diaphragms.

Teacher's Note:
1. Open circulation gives a haemocoel.
2. Haemo means blood.

Answer: (b) Oenocytes

Explanation:
1. Oenocytes of the epidermis and fat body secrete the wax layer on the cuticle.
2. It reduces water loss.

Teacher's Note:
1. The epicuticle contains wax.
2. Oenocytes are wax-secreting cells.

Answer: (d) All of the above

Explanation:
1. Fat body is made of trophocytes, urocytes, mycetocytes and oenocytes.
2. So all options are correct.

Teacher's Note:
1. Fat body stores fat, protein and glycogen.
2. It is a food reserve.

Answer: (c) Midgut

Explanation:
1. Hepatic caecae are finger-like outgrowths at the junction of foregut and midgut that are of mesenteron origin.
2. They secrete digestive juices.

Teacher's Note:
1. There are 6 to 8 caecae.
2. Midgut is lined with endoderm.

Answer: (b) Amylase

Explanation:
1. Saliva has amylase that begins the digestion of starch.
2. Pepsin and trypsin are not found in insect saliva.

Teacher's Note:
1. Salivary amylase acts on carbohydrates.
2. Saliva is produced by a pair of glands.

Answer: (b) Hypopharynx

Explanation:
1. The common salivary duct opens at the base of the hypopharynx.
2. It delivers saliva to the mouth region.

Teacher's Note:
1. Hypopharynx is the tongue.
2. Saliva is released into the preoral cavity.

Answer: (c) Cutting and chewing

Explanation:
1. The biting and chewing type has mandibles with teeth.
2. Piercing and absorbing types occur in mosquitoes and butterflies.

Teacher's Note:
1. Cockroach = biting and chewing.
2. Mosquito = piercing and sucking.

Answer: (a) Omnivorous

Explanation:
1. It feeds on plant and animal matter, including leftovers and paper.
2. It does not feed only on plants, flesh or blood.

Teacher's Note:
1. Omnivores eat both plants and animals.
2. It is a scavenger.

Answer: (b) Gizzard

Explanation:
1. The gizzard has six chitinous teeth and grinds the food.
2. The crop only stores food.

Teacher's Note:
1. Crop stores, gizzard grinds.
2. Teeth are on the inner wall of the gizzard.

Answer: (d) Both anterior and posterior parts

Explanation:
1. The foregut and hindgut develop from the ectoderm and are lined with cuticle.
2. The midgut is endodermal and has no cuticle.

Teacher's Note:
1. Stomodaeum and proctodaeum are ectodermal.
2. Mesenteron lacks cuticle.

Answer: (a) Cuticle

Explanation:
1. The gizzard has a thick cuticular lining that bears the teeth.
2. The peritrophic membrane is in the midgut.

Teacher's Note:
1. Foregut is cuticle-lined.
2. Peritrophic membrane protects the midgut wall.

Answer: (b) Trachea

Explanation:
1. The tracheal system carries air directly to the tissues.
2. The blood is not involved in oxygen transport.

Teacher's Note:
1. Cockroach blood lacks haemoglobin.
2. Tracheae open through spiracles.

Answer: (b) Heart

Explanation:
1. Alary muscles are triangular muscles that hold the heart to the body wall.
2. They help in its pumping action.

Teacher's Note:
1. Alary muscles help the heart.
2. There are 12 pairs.

Answer: (d) 10

Explanation:
1. There are 10 pairs, two thoracic and eight abdominal.
2. They are the openings of the tracheae.

Teacher's Note:
1. Thorax 2 pairs, abdomen 8 pairs.
2. Spiracles have valves.

Answer: (c) Tracheal tubes

Explanation:
1. Branching tracheal tubes carry air to the tissues.
2. The haemolymph has no respiratory pigment.

Teacher's Note:
1. Tracheae end in tracheoles.
2. This is an efficient system for small animals.

Answer: (d) It has some other means to carry oxygen directly to the tissues

Explanation:
1. Oxygen is delivered to the cells by tracheae.
2. Therefore blood has no oxygen-carrying role.

Teacher's Note:
1. Direct delivery makes pigments unnecessary.
2. Blood carries food and wastes.

Answer: (d) Anterior aorta

Explanation:
1. The anterior aorta arises from the first chamber and carries blood to the head sinus.
2. Ostia are openings through which blood enters the heart.

Teacher's Note:
1. Heart has 13 chambers.
2. Ostia let blood in, aorta takes it out.

Answer: (c) 13

Explanation:
1. The heart is a tube divided into 13 funnel-shaped chambers.
2. Each chamber has a pair of ostia.

Teacher's Note:
1. Memorise 13 chambers.
2. Heart lies in the pericardial sinus.

Answer: (c) Open

Explanation:
1. Blood flows into sinuses and bathes the organs directly.
2. There are no capillaries.

Teacher's Note:
1. Open circulation: haemolymph in haemocoel.
2. Closed circulation has capillaries.

Answer: (c) Longitudinal and beaded

Explanation:
1. The heart is a long dorsal tube with 13 chambers that looks beaded.
2. It lies dorsal to the gut.

Teacher's Note:
1. The heart is dorsal in arthropods.
2. Annelids also have a dorsal vessel.

Answer: (d) Colourless

Explanation:
1. The haemolymph has no respiratory pigment, so it is colourless.
2. Vertebrates are red due to haemoglobin.

Teacher's Note:
1. Haemolymph has plasma and haemocytes.
2. Colourless in most insects.

Answer: (c) Uric acid

Explanation:
1. Cockroaches are uricotelic.
2. Uric acid saves water.

Teacher's Note:
1. Uricotelic: insects, birds and reptiles.
2. Urea: mammals and frog.

Answer: (c) Excretion

Explanation:
1. These tubules collect nitrogenous waste from the haemolymph and pour it into the hindgut.
2. They are excretory organs.

Teacher's Note:
1. Malpighian tubules are at the junction of midgut and hindgut.
2. There are 60 to 150 of them.

Answer: (d) Malpighian tubules

Explanation:
1. Malpighian tubules remove nitrogenous waste.
2. Nephridia are in earthworms.

Teacher's Note:
1. Insects have Malpighian tubules.
2. Earthworms have nephridia.