STD 11 - 4. Animal kingdom — NEET STD 11 Science — Question

Which of the following is absent in frog

Which of the following is regarded as a unit of nervous tissue

Give below are two statements :
Statement - I : When an infected female Anopheles mosquito bite, it release gametocytes of plasmodium into the healthy person.
Statement - II : The female Anopheles mosquito takes up sporozoites of Plasmodium with blood meal from an infected person, suffering form malaria.
In the light of the above statements, Choose the most appropriate answer from the options give below :

First mammals appeared in the period

Which one occurs in mollouscs but not in echinoderms

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.

Nitrogenous metabolic wastes in our body are the products of

An athlete while running fell on the track. She used her hands to sustain minimal injury. In the process, her hands received the maximum blow on the joints. Which combination of joints would be badly affected in this accident ?

Select the Ex-situ conservation