Name two egg laying mammals.
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Why is it necessary to separate oxygenated and deoxygenated blood in mammals and birds?
Warm-blooded animals such as birds and mammals maintain a constant body temperature by cooling themselves when they are in a hotter environment and by warming their bodies when they are...
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What would be the ratio of chromosome number between an egg and its zygote? How is the sperm genetically different from the egg?
The ratio is 1 : 2. Sperms contain either X or Y chromosome whereas an egg will always have an X chromosome.
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Find out the false statement (a) Aves are warm blooded, egg laying and have four chambered heart
(d) Fishes, amphibians and reptiles are oviparous
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Give reasons for the following: (a) Echidna and platypus lay eggs, but are considered as mammals.
(a) Echidna and platypus lay eggs, but are considered as mammals because (i) They are warm blooded animals (ii) They all have four chambered heart (iii) Mammary glands for the production of milk...
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The cat, platypus and man are all mammals, yet one of the most unique features of mammals helps to divide them into two groups
(a) Both cat, platypus are oviparous. Oviparous animals are animals that reproduce by laying eggs while man is viviparous. Viviparous animals bear live young that have developed inside the mother's...
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Name the parts of the human female reproductive system where (i) fertilisation takes place, (ii) implantation of the fertilised egg occurs.
(a) Testes produce sperms and secrete a hormone called testosterone. The function of testosterone is to control the development of male sex organs and secondary sexual features. (b) (i) Oviduct or fallopian tubes (ii) Uterus Alter implantation,...
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Which among these is the correct combination of aquatic mammals ?
The correct answer is (2) Sharks and Trygon (sting ray) are the members of cartilaginous fish while Whale, Dolphin and Seals are aquatic mammals belong to class mammalia.
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Which of the following situations correctly describe the similarity between an angiosperm egg and a human egg?
(b) iv only iv. Syngamy in both results in the formation of zygote Choose the correct answer from the options given below:
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Choose the incorrect statement from the following: a. In birds and mammals internal fertilisation takes place
c. Polyspermy is prevented by the chemical changes in the egg surface
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According to Allen’s Rule, the mammals from colder climates have: a. shorter ears and longer limbs
c. longer ears and longer limbs
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