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The correct answer is (b) Legs of FROGS can be EATEN

Best EXPLANATION: Frogs are beneficial for farming as they feed on insects and hence protect the agricultural crop. They are an ESSENTIAL part of the food web and hence maintain ECOLOGICAL balance. They are not herbivores. Frog legs can be eaten.

The CORRECT answer is (c) Gall bladder

To elaborate: BILE is stored in the gall bladder of the frog after it has been secreted by the liver. Bile is a greenish-yellow fluid that EMULSIFIES fats. Bidder’s canal is a PART of the male reproductive system of frogs.

Right choice is (d) OSTIA

Easy explanation: The MAXILLARY palps, labial palps and ANAL cerci are some of the sense organs in cockroach. Ostia are not sensory organs but a part of the circulatory system. They are LOCATED on either side of the HEART chambers.

The correct option is (b) False

To explain: False, as crop is USED for the STORAGE of food. It is a sac like structure that is located after the esophagus. The GIZZARD is located after the crop. Its function is the MECHANICAL breakdown of food by grinding.

Correct choice is (a) True

The EXPLANATION is: The head of the cockroach is JOINED to its thorax by the neck. The neck is a flexible structure. HENCE, the head SHOWS a great degree of movement in all directions. THEREFORE, the statement is true.

Right option is (c) omnivore

For explanation: Cockroaches feed on a VARIETY of food which are of both plant and animal origin. Hence, they are omnivores. They MOSTLY live in damp PLACES and are nocturnal. This means they are mostly active during the NIGHT.

Correct choice is (c) SPERMATOPHORES

For explanation: Spermatophores are exchanged between TWO EARTHWORMS during mating. Spermatophores are packs of sperm. They exchanged between the GONADAL openings of the mating earthworms.

Right answer is (C) 4, 5 and 6

The EXPLANATION is: In EARTHWORM, blood glands are PRESENT on the 4^th, 5^th and 6^th segments. They produce blood cells and haemoglobin which is directly dissolved in blood plasma as their blood does not have any RESPIRATORY pigment.

Right option is (a) PLASMA membrane

The explanation: The electrical signal of a stimulated NEURON travels along the plasma membrane by a series of polarization and depolarization. At the ENDING of the neuron, the signal is transmitted to the TARGET TISSUE or the adjacent neuron.

Right ANSWER is (b) False

The BEST explanation: BONE is the main tissue that provides the structural frame to the body. Bones support and protect softer tissues and ORGANS. Limb bones, such as the LONG bones of the legs, serve weight-bearing functions.

Correct option is (d) Smooth

Explanation: Connective tissues are classified into three types-

i. Loose connective tissue

ii. Dense connective tissue

iii. SPECIALISED connective tissue

In all the connective tissues except blood, the CELLS secret fibres of structural proteins called COLLAGEN or ELASTIN.

Correct CHOICE is (d) PASSING of ova

Best explanation: The cloaca is an excretory organ of frog. It is connected to both the excretory SYSTEM and the reproductive system of MALE frog. It helps in the passing of SPERM, fecal matter and urine, but not ova.

Right choice is (c) Brood pouch

Best explanation: The brood pouch or the genital pouch contains the spermathecal pores. The brood pouch ALSO contains the female GONOPORE and the COLLATERAL GLANDS. The 7^th, 8^th and 9^th SEGMENTS of the abdomen make up the brood pouch.

The correct choice is (a) vermicomposting

Best explanation: Using EARTHWORMS to increase soil fertility is called vermicomposting. Sericulture is associated with SILKWORMS; APICULTURE is associated with BEES and pisciculture is associated with fish. They have industrial importance.

Correct option is (b) They do not REGULATE the composition of body fluids

Explanation: Nephridia regulate both the VOLUME as well as the composition of body fluids. They are the EXCRETORY organs of the earthworm. They are of THREE types – septal, INTEGUMENTARY and pharyngeal.

Right option is (c) BODY SURFACE

For explanation I would say: Respiratory exchange in EARTHWORMS takes place via the body surface. Since earthworm is an annelid, it lacks gills and lungs. The MOUTH of the earthworm is responsible for uptake of food only.

The correct answer is (d) 4^th to 6^th

Best explanation: The 4^th, 5^th and 6^th segments of the body of the earthworm contain the BLOOD glands. The function of these glands is to PRODUCE blood cells and hemoglobin. These COMPONENTS of blood are dissolved in the blood plasma.

The correct choice is (d) 26^th

For explanation I WOULD say: The 26^th SEGMENT of the body of the earthworm CONTAINS intestinal caeca. It projects out from the wall of the intestine. The intestine of the earthworm STARTS at the 15^th segment and continues till the last segment.

The CORRECT answer is (c) NEPHRIDIOPORE

For EXPLANATION: Nephridiopore is present on the surface of the earthworm’s BODY. They are numerous in number. They are minute in size. Polypore, exospore and zoospore are not ASSOCIATED with earthworm but with fungi.

Correct choice is (a) Collateral glands

To explain: 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.

Right answer is (C) Three

Explanation: 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.

Correct option is (b) SECOND segment

Easy EXPLANATION: In each body segment, except the FIRST, LAST and clitellum, there are rows of S-shaped setae, embedded in the epidermal pits in the middle of each segment. Setae can be extended or retracted. Their principal role is in LOCOMOTION.

Correct option is (b) Protection

Easiest explanation: COMPOUND EPITHELIUM is multi – layered and has a minimal role in secretion and ABSORPTION. The main function of these cells is to provide protection against STRESSES – both MECHANICAL and chemical. Glandular epithelium plays a major role in secretion and absorption.

The correct answer is (d) CONDUCTION

Easy explanation: Epithelial tissue performs the function of PROTECTION, secretion, absorption, EXCRETION and diffusion. Conduction of stimulus is the function of NEURAL tissue.

Correct choice is (b) Epithelial TISSUE

Explanation: Epithelial tissue is derived from Ectoderm, MESODERM and ENDODERM. Connective and MUSCULAR TISSUES are derived from mesoderm. Nervous or neural tissue is derived from ectoderm.

The correct CHOICE is (d) Function

The explanation is: The structure of the cells varies according to their function. Therefore, the tissues are DIFFERENT and are broadly CLASSIFIED into four types –

i. Epithelial TISSUE

ii. CONNECTIVE tissue

iii. Muscular tissue

iv. Neural tissue.

Correct ANSWER is (C) First digit of the forelimbs

Explanation: The copulatory PADS of the male frog are PRESENT on the first digit of the forelimbs. Frogs show sexual dimorphism and the presence of copulatory pads in male frogs is a DISTINGUISHING feature of the two sexes.

Right choice is (a) Nictitating MEMBRANE

To explain I WOULD say: The nictitating membrane protects the eyes of the frog in water. The tympanum is the ear of the frog. Cloaca are excretory organs. Bidder’s canal is a PART of the male reproductive system of FROGS.

The CORRECT CHOICE is (c) DUODENUM

The explanation: The hindgut of the COCKROACH is divided into three parts, namely, the ileum, the colon and the rectum. Duodenum is not a structure of the hindgut. The hindgut is broader than the MIDGUT of the cockroach.

Correct option is (a) Visualize FOOD

For explanation: The SENSORY system of earthworm lacks eyes. Hence, the earthworm cannot visualize its food. However, it CONTAINS receptor cells which helps it to DETECT vibrations, changes in light intensities and allows it to react to chemical stimuli.

The correct option is (b) False

For explanation I would say: Pheretima has a closed blood vascular system. This implies that its blood is CONFINED to the components of the vascular system only. The components of this vascular system are heart, blood vessels and capillaries. In closed type of vascular system, the circulating blood travels in ONE DIRECTION only.

Correct option is (b) Bilobed tongue

Explanation: FOOD is CAPTURED by the bilobed tongue of the frog. DIGESTION of food takes place by the action of HCl and gastric JUICES secreted from the walls of the STOMACH.

The correct option is (c) In damp places

The best I can EXPLAIN: 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.

The correct answer is (a) Friends of farmers

To ELABORATE: Earthworms are commonly called as friends of farmers because they make BURROWS in the soil and make it porous which HELPS in respiration and penetration of the DEVELOPING plant ROOTS. The process of increasing fertility of the soil by the earthworms is called vermicomposting.

Correct OPTION is (c) proximal convoluted TUBULE of nephron

The BEST explanation: Proximal convoluted tubule of nephron in the kidneys contain CUBOIDAL epithelium with microvilli. This helps in absorption. The rest of the OPTIONS contain squamous epithelium.

Right choice is (b) Bones

Easy explanation: The wall of internal organs such as the blood VESSELS, stomach and INTESTINE contain SMOOTH muscles. They are INVOLUNTARY as their FUNCTIONING cannot be directly controlled.

The CORRECT choice is (a) Solid and PLIABLE

Explanation: The intercellular matrix of cartilage is solid and pliable and resists compression. Cartilage is PRESENT in the tip of the nose, OUTER ear joints, between ADJACENT bones of the vertebral column, limbs and hands in adults.

Correct choice is (c) Trachea

The EXPLANATION: SQUAMOUS epithelium is made of a SINGLE thin layer of flattened cells with irregular boundaries. They are found in the walls of blood VESSELS, lymph vessels, air sacs of LUNG alveoli, Bowman’s capsule and Henle’s loop.

Right option is (B) False

Easiest explanation: Frogs have simple EYES. This means that their eyes are made of SINGLE units each. COMPOUND eyes are made of several OMMATIDIA and are characteristic of arthropods, annelids and mollusks.

Right CHOICE is (c) Head, TRUNK

Explanation: The body of the frog is divided into a head and a trunk. Neck and TAIL are absent. Frogs are green with dark irregular spots on the dorsal SIDE. On the ventral side, they are pale yellow in color.