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The correct answer is (c) 14^th segment

Easiest explanation: The female GENITAL PORE of the earthworm is present in the mid – VENTRAL LINE of the 14^th segment. It is a single pore. The male genital pores are two in NUMBER. It is present on the 18^th segment. Earthworms are hermaphrodites.

Right choice is (d) THIRTEEN

To explain I would say: The heart of cockroach CONSISTS of an elongated muscular tube lying ALONG the mid-dorsal line of thorax and abdomen. It is DIFFERENTIATED into thirteen funnel – SHAPED chambers with ostia on either side.

The correct option is (d) Six

Easy explanation: 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.

Correct option is (b) External and cross-fertilization

The explanation is: The type of fertilization exhibited by earthworm is External and cross-fertilization. Fertilisation and development OCCUR WITHIN the cocoons which are deposited in the soil. Development of EARTHWORMS is direct, i.e., there is no larva FORMATION.

Right choice is (a) GASTROINTESTINAL tract

For EXPLANATION I would say: Ciliated epithelium present on the inner LINING of uterus, fallopian tubes and BRONCHIOLES FACILITATE the movement of particles and mucus in a specific direction. The lining of the gastrointestinal tract contains non-ciliated epithelial tissue.

The CORRECT answer is (c) Hormones

To explain: Exocrine gland secretes mucus, SALIVA, earwax, oil, MILK, digestive enzymes and other cell products. Their products are released through ducts or TUBES. In contrast, endocrine glands do not have ducts. Their products are called hormones and are secreted DIRECTLY into the fluid bathing the gland.

Right answer is (b) FORAMEN magnum

Explanation: The foramen magnum lies between the MEDULLA oblongata and the spinal cord in frogs. The medulla oblongata is a part of the hindbrain of frogs. The BRAIN and the spinal cord together make up its central nervous system.

Right answer is (c) 10^th

Easy explanation: The anal cerci are present in the 10^th abdominal segment in both male and FEMALE cockroaches. Cockroaches possess one pair of anal cerci. The anal cerci are jointed FILAMENTOUS STRUCTURES.

The correct OPTION is (b) The SENSE organs are located posteriorly

The explanation is: The sense organs of the earthworm are located on the anterior side of the BODY. Eyes are absent. It contains taste receptors or chemoreceptors. The receptor cells ALLOW the earthworm to detect vibrations and changes in light intensity.

Right OPTION is (a) Mouth→Pharynx→Esophagus→Gizzard

To explain I would SAY: Food is ingested by the earthworm through the mouth. The mouth part OPENS up into the muscular pharynx. This is followed by a narrow esophagus followed by the gizzard where food is broken down by the PROCESS of GRINDING.

Correct answer is (B) They are retractable

Explanation: Setae are both extendable and retractable. They are S – shaped and present in the EPIDERMAL pits in the mid – SEGMENTAL REGION of every segment. The PRINCIPAL function of the setae is locomotion.

Right choice is (C) Urea

Easiest explanation: The frog excretes NITROGENOUS WASTES in the form of urea and thus is a ureotelic organism. Excretory wastes are carried by BLOOD into the kidney where it is separated and excreted.

Correct choice is (d) Worm castings

To explain I would say: During DAY time, earthworms live in BURROWS made by BURROWING and SWALLOWING the soil. In the gardens, they can be traced by their faecal DEPOSITS known as worm castings.

Correct option is (C) 2500 to 3000

Explanation: A female frog typically LAYS 2500 to 3000 ova. Fertilization is external in frogs and takes place in water. The development consists of a larval stage called TADPOLE. The tadpole is aquatic in NATURE.

Right answer is (c) Intestine

The EXPLANATION: Final digestion in frogs takes place in the intestine where pancreatic JUICES break down proteins and carbohydrates and bile break down FAT. The undigested food moves to the RECTUM end EXITS through the cloaca.

The CORRECT option is (a) True

To EXPLAIN I would say: The compound eyes of cockroach are present on the dorsal side of its head. Each eye of the cockroach consists of around 2000 ommatidia through which the cockroach receives SEVERAL IMAGES of an object.

Correct choice is (c) MEMBRANOUS, Transparent

Explanation: The hindwings of the COCKROACH are LOCATED below the forewings. The hindwings are membranous and transparent. They are USED for the PURPOSE of flight. The forewings are opaque and leathery.

Right option is (C) Bithorax

To explain: In COCKROACH, the thorax is divided into three parts – prothorax, mesothorax and metathorax. Apart from the thorax, the cockroach also POSSESSES a triangular anterior HEAD and an ABDOMEN.

Correct answer is (c) They arise from membranous sockets

To EXPLAIN I would say: Cockroaches have two antennae, that is, ONE pair of antennae. They have sensory receptors to help assess the surrounding environment. The antennae are PRESENT in the head region and arise from membranous sockets in FRONT of the eyes.

Right option is (c) Pheretima, Lumbricus

To explain: Pheretima and Lumbricus are the common INDIAN EARTHWORMS. It is a terrestrial INVERTEBRATE with a long CYLINDRICAL BODY. Periplaneta is a genus of the cockroach family, while Lacertilia is the genus of the lizard family.

The correct CHOICE is (b) Fat

To explain I WOULD say: Adipose TISSUE is a classification of loose connective tissue. EXCESS nutrients are stored as fat in these tissues. It also serves to protect the body from SHOCKS and stresses.

The correct answer is (a) Only in the heart

To elaborate: Cardiac muscle TISSUE is a contractile tissue present only in the heart. CELL junctions fuse the plasma membranes of cardiac muscle cells and MAKE them stick together.Fastest contraction is SEEN in cardiac muscles.

Correct option is (a) True

Best explanation: AREOLAR tissue is PRESENT beneath the SKIN. It serves as a support framework for epithelium. It contains fibroblasts, macrophages and mast CELLS. It is a TYPE of loose connective tissue.

Right answer is (a) True

To EXPLAIN I would say: The nuclei of columnar epithelial cells are located at the base. The columnar epithelium is COMPOSED of a single LAYER of tall and SLENDER cells. This epithelium is found in small intestine and stomach.

Correct option is (a) Epithelial tissue

Easy explanation: Epithelial tissue has the most regenerative POWER while NEURAL tissue has the least regenerative power. We COMMONLY REFER to an epithelial tissue as EPITHELIUM.