STD 11 - 16. Excretory product and their elimination — NEET STD 11 Science — Question

What are all the chances of colour blind daughter and sons being born in a marriage of normal man marrying a normal woman, whose father was colour blind

Regeneration power can best be studied in

Read the following statements.
(i) Annelids possess longitudinal and circular muscles which helps in osmoregulation.
(ii) Nereis possess lateral appendages, parapodia that help in swimming.
(iii) Nephridia helps in osmoregulation and excretion in annelids.
(iv) Neural system of annelids consists of paired ganglia connected by lateral nerves to a single ventral nerve cord.
(v) Arthropods is the largest phylum of Animalia and over 2/3rd of all named species on earth are member of this phylum.
(vi) The body of arthropods is covered by chitinous exoskeleton.
(vii) Statocysts are present as balance organs in arthropods.
(viii) Excretion takes place in arthropods through malpighian tubules.
(ix) Fertilisation is external in arthropods.
(x) In phylum arthropod, locusta member is gregarious pest and limulus is a living fossil.
(xi) Mollusca is the second largest animal phylum. The body of member of this phylum is covered by calcareous shell.
(xii) In mollusca, a soft and spongy layer of skin forms mantle over the visceral hump. The space between hump and the mantle is called mantle cavity.
(xiii) The mouth contains a file-like rasping organ for feeding, called radula in echinodermata.
(xiv) Pinctada is commonly known as pearl oyster and pila as apple snail.
(xv) Sepia is commonly known as cuttlefish and octopus as devil fish.
(xvi) Digestive system is complete in echinodermata with mouth on the dorsal side and anus on ventral side of body.
(xvii)The most distinctive feature of sponges is the presence of water vascular system.
choose the option with all correct statements :-

Select the correct statements for pollination :
a. Pollinating agents are air, water and animals.
b. Pollination by water is more common amongst abiotic pollination.
c. All aquatic plants use water for pollination.
d. Among animals only insects are pollinating agent

Organs that have different embryonic origin but perform similar functions are

Which one of the following is not a property of cancerous cells whereas the remaining three are ?

Which one affects liver, muscle and adipose tissue

Which of the following statements are correct for transport of carbon dioxide ?
(i) Nearly 20-25 per cent of CO₂ is transported by RBCs as carbamino-haemoglobin.
(ii) 70 percent CO₂ is carried as bicarbonate.
(iii) About 7 per cent of CO₂ is carried in a dissolved state through plasma.
(iv) Binding of carbon dioxide with haemoglobin is related to the partial pressure of CO₂
(v) pO₂ is a major factor which could affect binding of carbon dioxide with haemoglobin.
(vi) When pCO₂ is low and pO₂ is high as in the tissues, more binding of carbon dioxide occurs whereas.
(vii) When the pCO₂ is high and pO₂ is low as in the alveoli, dissociation of CO₂ from carbamino- haemoglobin takes place.
(viii) Every 100 ml of deoxygenated blood delivers approximately 4 ml of CO₂ to the alveoli.