STD 12 - 4. principal of inheritance and variation — NEET STD 11 Science — Question

Select the answer which correctly matches the endocrine gland with the hormone it secretes and its function/deficiency symptom.

Which of the following contraceptive methods do involve the role of hormone?

The heart of frog consists of

Which of the following has no muscular wall

Ovarian hormones are

A survey of animal kingdom presents a variety of excretory structures. In most of the invertebrates, these structures are simple tubular forms whereas vertebrates have complex tubular organs called kidneys. Some of these structures are mentioned here.
(i) Protonephridia or flame cells are the excretory structures in Platyhelminthes.
(ii) Planaria and amphioxus have protonephridia is a excretory structures.
(iii) Nephridia are the tubular excretory structures of earthworms and other annelids.
(iv) Nephridia help to remove nitrogenous wastes and maintain a fluid and ionic balance.
(v) Malpighian tubules are the excretory structures of most of the insects and molluscs including cockroaches.
(vi) Antennal glands or green glands perform the excretory function crustaceans like prawns.
Which of the following statements are correct ?

Natural methods of contraception

Uricotelic mode of passing out nitrogenous wastes is found in

Skeletal system consists of a framework of bones and a few cartilages. Bone and cartilage are specialised connective tissues. Which of the following statement are incorrect for human skeletal system ?
(i) The bones of the limbs along with their girdles constitute the appendicular skeleton.
(ii) Each limb and leg is made of 30 bones.
(iii) The scapula has a acromion process.
(iv) In pectoral girdle acetabulum cavity present which articulates with the head of the humerus to form the shoulder joint.
(v) Pelvic girdle consists of two coxal bones and it has a cavity called glenoid to which the thigh bone articulates.
(vi) Fibrous joints shown by the flat skull bones in the form of sutures, to form the cranium.
(vii) Cartilaginous joints, permits limited movements.
(viii) Between carpal and metacarpal of thumb saddle joint is present and between the carpals gliding joint is present.