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

Which of the following statements are correct for Earthworm ?
(i) The common Indian earthworms are Pheretima and Lumbricus.
(ii) The body is divided into about 100-120 short segments which are similar.
(iii) During day time, they live in burrows made by boring and swallowing the soil.
(iv) In the gardens, they can be traced by their faecal deposits known as worm castings.
(v) The peristomium is sensory in function.
(vi) The first body segment is called the prostomium which contains the mouth.

Choose the group of parasitic animal

Location of cartilage.

Which of the following arrangement of periods of the mesozoic era gives a correct sequence from the earliest to the latest?

Choose correct sequence of mechanism of vision
(i) The light rays in visible wavelength focused on the retina through the cornea and lens
(ii) Light induces dissociation of the retinal from opsin resulting in changes in the structure of the opsin
(iii) This causes membrane permeability changes.
(iv) Potential differences are generated in the photoreceptor cells rods and cones
(v) This produces a signal that generates action potentials in the ganglion cells through the bipolar cells.
(vi) These action potentials (impulses) are transmitted by the optic nerves to the visual cortex area of the brain.
(vii) Where the neural impulses are analysed and the image formed on the retina is recognised based on earlier memory and experience.

How many layers are present in the diffusion membrane of alveolus capillary?

Which ones are all sexually transmitted diseases ?

Which one of the following statements are correct ?
(i) Entamoeba histolytica is a protozoan parasite in large intestine of human which causes amoebiasis (amoebic dysentery) and fruitflies act as mechanical carriers for spread of this disease.
(ii) Wuchereria bancrofti and W.malayi causes elephantiasis or filariasis.
(iii) Many fungi belong to genera Microsporum, Trichophyton and Epidermophyton are responsible for ringworms. heat and moisture conditions help these fungi to grow in groin or between toes.
(iv) Fishes like Gambusia feed on the mosquito larvae in ponds.
(v) The overall ability of host to fight the disease is called immunity.
(vi) In cellular barriers of acquired immunity, certain types of WBC of our body like polymorpho-nuclear leukocyte and monocytes and natural killer in body as well as macrophages in tissue can phagocytose and destroy microbe.
(vii) The response produce by body when it encounter pathogen for the first time is called secondary response.
(viii) The secondary response due to encounter with same pathogen is called anamnestic.
(ix) Two types of lymphocyte present in our body are B-and T-lymphocyte.
(x) T-lymphocyte produces army of protein in response to pathogen called antibodies.
(xi) Each antibody molecule has 2 peptide chains.
(xii) Antibody molecule has 2 light chains and 2 heavy chains and hence antibody is represented as H.L.
(xiii) The immune response mediated by B-lymphocyte is called humoral immune response and by T-lymphocyte is called cell- mediated response.
Choose the correct option given below :-

Internal bleeding, fever, muscular pain = ascariasis :: abdominal pain, constipation and

Which is universal for sponges