Which of the following is an incorrect match of cell junction along with its structure and function?
A)
Cell junction Structure Functions Tight junctions Tightly bound, leak proof, fibrous protein ?belt? that surrounds cells Organizing junction: hold cells together such that material passes through but not between the cells
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B)
Cell junction Structure Functions Desmosomes Intermediate filaments linked to adjoining cells through cadherins Anchoring junction: ?buttons? cells together
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C)
Cell junction Structure Functions Plasmodesmata Six trans membrane connexon proteins creating a ?pipe? that connects cells Communicating junctions: allow passage of small molecules from cell to cell in a tissue
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D)
Cell junction Structure Functions Adherens junctions Trans membrane fibrous proteins Anchoring junction: ? roots extra cellular matrix to cytoskeleton
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Leguminous plants are able to fix atmospheric nitrogen through the process of symbiotic nitrogen fixation. Which one of the following statements is not correct for this process of nitrogen fixation?
A)
Leghaemoglobin scavenges oxygen and is pinkish in colour.
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B)
Nodules act as sites for nitrogen fixation.
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C)
The enzyme nitrogenase catalysis the conversion of atmospheric \[{{N}_{2}}toN{{H}_{3}}\]
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D)
Nitrogenase is insensitive to oxvaen.
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Which of the following is most appropriately correct?
A)
In Ascomycetes, the sexual reproduction involves a phase called dikaryophase.
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B)
In Ascomycetes, fusion of two haploid cells immediately results in diploid cells without any intervening dikaryotic stage.
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C)
In fungi, sexual reproduction occurs by zoospores.
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D)
Ascospores in fungi are produced during asexual reproduction.
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Match column I with column II and select the correct option from the codes given below.
Column I Column II (Deficient elements) (Deficiency symptoms) Calcium (i) Chlorosis and necrosis appearing first in young leaves Magnesium (ii) Bronze colour in leaves Chlorine (iii) Delay in flowering, premature fall of flower buds Phosphorus (iv) Interveinal chlorosis
A)
-(i), -(ii), -(iii), -(iv)
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B)
-(iv), -(iii), -(ii), -(i)
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C)
-(i), -(iii), -(ii), -(iv)
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D)
-(i), -(iv), -(ii), -(iii)
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Aestivation of petals in the flower of cotton is correctly shown in
A)
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B)
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C)
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D)
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Match column-1 with column-11 on the basis of the given graph and select the correct option from the codes given below.
P represents (i) Some factor other than light intensity is becoming the limiting factor Q represents (ii) Light intensity is no longer a limiting factor R represents (iii) Light intensity is the limiting factor S represents (iv) Maximum rate of photosynthesis T represents (v) Saturation point for light intensity
A)
-(i), -(ii), -(iii), -(iv), (e)-(v)
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B)
-(iii), -(i), -(ii), -(v), (e)-(iv)
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C)
-(iv), -(ii), -(v), -(iii), (e)-(i)
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D)
-(v), -(iv), -(iii), -(ii), (e)-(i)
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Select the correct option with respect to mitosis.
A)
Chromatids separate but remain in the centre of the cell in anaphase.
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B)
Chromatids start moving towards opposite poles in telophase.
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C)
Chromosomes move to the spindle equator and get aligned along equatorial plate in metaphase.
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D)
All of these
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Consider the following statements. (i) In prokaryotic cells, a special membranous structure formed by the extension of the plasma membrane into the cell is known as polysome. (ii) The smooth endoplasmic reticulum is the major site for synthesis of glycoproteins. (iii) RuBisCO is the most abundant protein in the whole of biosphere. (iv) Mitochondria, chloroplasts and peroxisomes are not considered as part of endomembrane system. Of the above statements
A)
(iii) and (iv) are correct
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B)
(i) and (ii) are correct
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C)
(ii) and (iii) are correct
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D)
(i) and (iv) are correct.
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Identify the given figure and select the correct option for a, b and c.
A)
a b c Leaf primordium Shoot apical meristem Apical bud
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B)
a b c Leaf primordium Shoot apical meristem Axillary bud
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C)
a b c Root primordium Root apical meristem Axillary bud
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D)
a b c Root primordium Root apical meristem Apical bud
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Consider the following statements with respect to algae. Fusion between one large, non-motile female gamete and a smaller, motile male gamete is termed as oogamous. b. Fusion of two gametes dissimilar in size is termed as isogamous. c. Fusion of two gametes similar in size is called anisogamous. d. In Chlorophyceae, the major photosynthetic pigments are chlorophyll a and b, and the food is stored as starch. e. In Rhodophyceae, the major photosynthetic pigments are chlorophyll a and d, and the food is stored as mannitol. Of the above statements
A)
a and e are correct
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B)
c and e are correct
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C)
a and b are correct
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D)
a and d are correct.
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Given below are four statements (a - d) each with one or two blanks. Select the option which correctly fills up the blanks in two statements.
Thymus secretes (i) which help in differentiation of (ii) The adrenal medulla secretes (i) which stimulates the breakdown of (ii) to increase the blood glucose concentration during emergency situations. The Leydig cells or (i) present in the intertubular spaces in testis, produce a group of hormones called (ii) Thyroid gland secretes (i) and triiodothyronine. (ii) is essential for the normal rate of hormone synthesis in the thyroid.
A)
- (i) melatonin, (ii) T-lymphocytes - (i) adrenaline, (ii) fat
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B)
- (i) mineralocorticoids, (ii) glycogen - (i) interstitial cells, (ii) testosterone
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C)
- (i) catecholamine, (ii) glycogen - (i) thyroxine, (ii) iodine
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D)
- (i) parathyroid hormone, (ii) calcium -(i) thymosin, (ii) B-lymphocytes
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The figures (P-S) show four animals. Select the correct option with respect to a common characteristic of two of these animals.
A)
Regeneration is best observed in 'P' and 'S'.
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B)
'Q' and 'R' have well developed photoreceptors.
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C)
'R' and 'S' have nematoblasts for offence and defense.
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D)
'P' and 'Q' exhibit polymorphism.
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Regarding circulatory adjustments during exercise which of the following is correct?
A)
The cardiac output increases more than tenfold in severe exercise.
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B)
The increase in cardiac output during exercise is mainly due to an increase in stroke volume.
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C)
The increase in stroke volume seen in exercise occurs despite a smaller end-diastolic volume.
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D)
In severe exercise the mean arterial pressure is unchanged because diastolic pressure falls.
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Which of the following statements are incorrect? (i) When an impulse travels along a myelin sheath neuron, it leaps over the myelin sheath from one node to the next. (ii) At chemical synapse there is continuity between the presynaptic and postsynaptic neurons provided by the gap junctions. (iii) Neurotransmitters are chemicals that are released from postsynaptic neuron which interact with specific receptors of presynaptic neuron. (iv) Neurons releasing acetylcholine are described as cholinergic neurons and those releasing noradrenaline are described as adrenergic neurons. (v) Refractory period is the period after the transmission of an impulse in a nerve fibre in which membrane of the axon regains its ability to transmit impulses.
A)
(i), (ii) and (v)
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B)
(ii) and (iv)
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C)
(ii) and (iii)
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D)
(i), (iii) and (v)
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The given diagram represents posterior region of male cockroach. Select the correct combination of labelling.
A)
1- 9th sternum, 2 - anal style, 3-10th tergum, 4 - anal circus
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B)
1 - anal style, 2 - anal cercus, 3-10th tergum, 4-9th sternum
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C)
1 - 9th sternum, 2 - anal cercus, 3 - 10th tergum, 4 - anal style
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D)
1 - 9th sternum, 2 - anal style, 3 - 10th tergum, 4 - anal circus
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Examine the figure of gastric gland given below and identify the labelled parts A to D.
A)
a b c d Oxyntic cell Chief cells Mucous cells Argentaffin cell
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B)
a b c d Argentaffin cell Oxyntic cells Mucous cells Chief cell
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C)
a b c d G cell Chief cells Mucous cells Argentaffin cell
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D)
a b c d Oxyntic cell G cells Mucous cells Chief cell
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Which of the following is correct about the given figure?
A)
The length of the thick and thin my filaments has changed.
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B)
Length of both anisotropic and isotropic band has changed.
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C)
The myosin cross-bridges move on the surface of actin and the thin and thick my filaments slide past each other.
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D)
Length of the sarcomere remains same.
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Choose the right sequential phenomena among the following during the delivery of \[{{O}_{2}}\]from blood to tissue. P: Absorption of \[C{{O}_{2}}\] by the blood. Q: Reaction of absorbed\[C{{O}_{2}}\], with \[{{H}_{2}}O\] to form \[{{H}_{2}}C{{O}_{3}}\] within RBC and its conversion into \[{{H}^{+}}\] and \[HCO_{3}^{-}\] ions in the presence of carbonic anhydrase enzyme. R: Reaction of absorbed\[C{{O}_{2}}\], with \[{{H}_{2}}O\] in plasma to form \[HC{{O}_{3}}\] and its conversion into \[{{H}^{+}}\]and \[HCO_{3}^{-}\] ions in the presence of carbonic anhyrase enzyme. S: Combination of \[{{H}^{+}}\] with home portion of\[Hb{{O}_{2}}\], to release\[{{O}_{2}}\]. T: Combination of \[HCO_{3}^{-}\]with heme portion\[Hb{{O}_{2}}\], to form reduced hemoglobin and release of\[{{O}_{2}}\].
A)
P, Q, T
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B)
P, R, S
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C)
P, Q, S
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D)
P, R, T
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Which of the following statements is incorrect regarding the given figure of 2 tissue?
A)
It is present under the skin as subcutaneous tissue.
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B)
It is a fat storing tissue.
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C)
It often serves as a support framework for epithelium.
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D)
It provides strength, elasticity and support to the parts where this tissue is present.
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The given figure shows a man experiencing a sudden withdrawal of the leg that got in contact with a pointed object. Which of the following nervous pathways gives such response?
A)
Receptor \[\to \]Efferent nerve fibre \[\to \]Grey matter of spinal cord \[\to \]Afferent nerve fibre \[\to \]Effector
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B)
Receptor \[\to \]Afferent nerve fibre \[\to \]Grey matter of spinal cord \[\to \]Efferent nerve fibre \[\to \]Effector
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C)
Effector \[\to \]Afferent nerve fibre\[\to \]White matter of spinal cord \[\to \]Efferent nerve fibre \[\to \]Receptor
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D)
Receptor \[\to \]Efferent nerve fibre \[\to \]White matter of spinal cord \[\to \]Afferent nerve fibre \[\to \]Effector
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