MCQ
Petromyzon belongs to
  • Agnatha
  • B
    Gnathostomata
  • C
    Protochordata
  • D
    Euchordata

Answer

Correct option: A.
Agnatha
a
Petromyzon (lamprey) belongs to phylum-Chordata, group-Craniata, subphylum-Agnatha and order-Petromyzontia.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Similar questions

World health organization has started a number of programmes to prevent spreading of $HIV$ infection

Few such steps include

$I.$ ensuring use of disposable needles and syringes

$II.$ free distribution of condoms

$III.$ advocating safe sex

$IV.$ controlling drug abuse

Which of the steps given above are correct?

Cu ions released from copper releasing intra uterine devices (IUDs):
Endocrine glands lack ducts and hence, called ductless glands. Their secretions are called hormones.
Choose correct characters of hormone.
(i) It is a chemical produced by endocrine glands.
(ii) It released into the blood and transported to a distantly located target organ.
(iii) Large number of chemicals act as hormones and provide coordination in the vertebrates.
(iv) Invertebrates possess very simple endocrine systems with few hormones.
(v) Hormones may be peptide, polypeptide, protein, steroids and amino acid derivatives.
(vi) Glucagon, cortisol, epinephrine and thyroid hormones are proteinaceous hormone.
(vii) Hormones are also secreted by some tissues which are not endocrine glands.
Which fluid is not present in semen ?
Process of exchange of $O_{2}$ from the atmosphere with ...$A$... produced by the cells is called ...$B$..., which is commonly known as ...$C$...

Choose the appropriate options for the blanks $A$, $B$ and $C$ to complete the given $NCERT$ statement

Choose correct answer :

$(i)$ Queen Elizabeth shows a number of haemophilic descendents.

$(ii)$ Variation in blood group prevalences due to incomplete dominance.

$(iii)$ Drosophila has three pairs of autosomal chromosomes.

$(iv)$ In birds, female is heterozygous.

Largest endocrine gland is
$Statement 1$: Use of condoms is a safeguard against $AIDS$ and sexual diseases besides checking pregnancy

$Statement 2$: Certain contraceptives are planted under the skin of the upper arm to prevent pregnancy

Plasmodium vivax causes
If a plant heterozygous for tallness is selfed, the $F_2$ generation has both tall and dwarf plants. This proves the principle of