Home
Class 12
BIOLOGY
Read the following statements regarding ...

Read the following statements regarding spleen and select the correct option.
(i) Spleen is a large oval-shaped organ which mainly contains lymphocytes and phagocytes.
(ii) Spleen is a large reservoir of erythrocytes.
(iii) Spleen is a primary lymphoid organ.
(iv) spleen acts as a filter of the blood by trapping blood-borne microorganisms.

A

(i) and (ii)

B

(ii) and (iv)

C

(i), (ii) and (iii)

D

(i), (ii) and (iv)

Text Solution

Verified by Experts

The correct Answer is:
D
Spleen is a secondary lymphoid organ.
Promotional Banner

Similar Questions

Explore conceptually related problems

Read the following statements regarding methanogens and select the correct option. (i) They are included in the group Archaebacteria. (ii) They are responsible for the production of biogas in gobar gas plants. (iii) They live in hot sulphur springs. (iv) They are strictly anaerobic.

Read the following statement regarding bryophytes and select the correct answer. (i). Bryophytes lack true roots, stem and leaves. (ii). The main plant body is haploid (iii). Sex-organs are unicellular and non-jacketed (iv). Fertilisation produces an embryo inside the water.

Read the following statements regarding euglenoids and select the incorrect ones. (i) These are mostly freshwater organisms found in stagnant water. (ii) Their body is covered by a protein rich layer called pellicle which makes their body flexible. (iii) They are photosynthetic in the presence of sunlight but become heterotrophs in the absence of sunlight. (iv) They usually prosses two flagella, one long and one short. (v) Euglenoids are multicellular ciliate protists

Study the following statements and select the incorrect ones. (i) Physical removal of large and small particles through filtration and sedimentation is called primary sewage treatment. (ii) Secondary sewage treatment is mainly a mechanical process. (iii) Activated sludge sediment in a sewage treatment plant is a rich source of aeroic bacteria. (iv) Biogas, commonly called as gobar gas, is pure methane.

Read the given statements about algae and select the correct option: (i). Plant body is thalloid (ii). They are largely aquatic. (iii). Reproduction occurs by vegetative, asexual and sexual methods. (iv). Chlamydomonas, volvox and Ulothrix are the multicellular algae.

Read the following statements regarding the various techniques used in cancer detection. (i) Cancer detection is based on biopsy and histopathological studies of the tissue, and blood and bone marrow tests for increased cell counts in case of leukaemia. (ii) In biopsy, a piece of the suspected tissue cut into thin sections is stained and examined under microscope by a pathologist. (iii) Techniques like radiography (use of X-rays), CT (computed tomography) and MRI(magnetic resonance imaging) are very useful to detect cancers of the internal organs. (iv) Computed tomography uses strong magnetic fileds and non-ionising radiations to detect physiological changes in living tissues. (v) MRI uses X-rays and ionising radiation to generate a 3-D image of the internal structure of an object. Which of the above statements are incorrect ?

Fill up the blanks in the following paragraph by selecting the correct option. overset((i))"____" are the primary female sex organs that produce overset((ii))"____" and overset((iii))"____" . Each primary sex organ is about overset((iv))"____" in length and is connected to the pelvic wall and uterus by overset((v))"____"

Which of the following statements regarding the disease typhoid is/are correct ? (i) Salmonella typhi are the pathogenic bacteria which enter human intestine through contaminated food and water migrate to other organs through blood. (ii) Sustained high fever (39^(@)C " to " 40^(@)C) , weakness, stomach pain, constipation, headache and loss of appetite are some common symptons of typhoid. (iii) Widal test is used for diagnosis of typhoid fever. (iv) The patient of this disease is not required to be treated with antibiotics.

Read the following statements with one or two blanks in each one of them. (i) A genus containing more than one species is called ______ genus, e.g., _______ . (ii) _______ is a collection of dried, pressed and preserved plants mounted on _________ sheets, properly labelled, systematically arranged and available for reference study. (iii) Living fossils are ancient organisms persisting in modern times _______ gradual morphological changes. (iv) A ________ is compreshensive treatise of a taxonomic group, generally a genus or a family, providing all taxonomic data related to that group. Which of the following correctly fills any two of the above statements ?

Refer to the following figures regarding division bryophyta. (i). 'A' are the androcyte mother cells of the antheridium, which give rise to a large number of biflagellate male gametes. (ii). 'B' is the autheridial chamber and 'C' is multicellular stalk of antheridium. (iii). 'D' and 'E' respectively represents venter canal cells and neck canal cell of the femal sex organ. (iv). 'F' is the egg cell of the archegonium, which usually possesses severatl female gameters. Which of the following combinations of above statements is incorrect?