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(d) clitellum and last segments Explanation: Except the first, the last and clitellar segment in each segment bear a ring of tiny curved, chitinou...

(d) touch Explanation: Frog has different types of sense organs like organs of touch (sensory papillae), taste (taste buds), smell (nasal epitheli...

(d) anal styles Explanation: Both the sexes of cockroach have anal cerci which are jointed structures. But in the male, in addition, there is a pa...

(a) All are correct All the given statements are correct.

(d) None of these Explanation: All the given statements about cell functions are true.

(d) Plasmodesmata

(b) administered large amounts of thyroxine. Explanation: Thyroxine helps in the metamorphosis of tadpole.

(c) ciliated epithelium Explanation: Columnar ciliated epithelium posses fine hair like ongrowths, cilia on thier free surfaces. This epithelium l...

(c) fixing of teeth Explanation: Sharpey's fibres are collagenous fibres that pass from the periodontal membrane into the cementum and the jaw bon...

(b) sarcomere Explanation: Sarcomere is the smallest contractile unit of striated muscle fibre. Sarcomere occurs as repeating units along the leng...

(a) perichondrium Explanation: Cartilage is a type of connective tissue consisting of cells (called chondrocytes) and though flexible matrix made ...

(b) collagen Explanation: Collagen is the major protein of connective tissue. Collagen, in the form of elongated fibrils is mostly found in fibrou...

(b) Thyroid Explanation: Thyroxine hormone produced by thyroid gland plays a very important role in the metamorphosis of frog.

(c) nervous system Explanation: Frog’s nervous system once differentiated remains as such throughout life.

(d) all of these Explanation: Gastrulation is the process of formation of three layers i.e. ectoderm, endoderm and mesoderm. In frog, these layers...

Answer is: (c) Explanation: Pericycle is the outermost layer of stele. In dicot stems, pericycle strengths the stem and provides protection to the...

Answer is: (b) Explanation: In isobilateral leaves, the upper epidermis contains specialized cells, i.e., bulliform or motor cells. They are highl...

Answer is: (b) Explanation: Vessels are more efficient for water conduction as compared to tracheids. Vessels resemble tracheids very much in stru...

Answer is: (a) Explanation: Petroplants are plants having large amount of latex with long chain hydrocarbons. Latex of these plants are a good sub...

Answer is: (a) Explanation: In woody trees, the central portion of stem is dark in colour. It is hard and tough due to deposition of resins, tanni...