26015.In a testcross involving F1 dihybrid flies, more parental-type offspring were produced than the recombinant-type offspring. This indicates:
Both of the characters are controlled by more than one gene.
The two genes are located on two different chromosomes
Chromosomes failed to separate during meiosis.
The two genes are linked and present on the same chromosome.
26016.Water-soluble pigments found in plant cell vacuoles are:
Anthocyanins
Xanthophylls
Chlorophylls
Carotenoids
26017.Which of the following pairs of hormones are not antagonistic (having opposite effects) to each other?
Relaxin – Inhibin
Parathormone – Calcitonin
Insulin – Glucagon
Aldosterone – Atrial Natriuretic factor
Explanation:
Parathormone increases blood calcium level and Calcitonin decreases blood calcium levels. Hence, antagonistic.
Insulin is hypoglycaemic & Glucagon in hyperglyceamic hormone. Hence, antagonistic.
Aldosterone causes reabsorption of Na+ ions from renal tubules and Atrial Natriuretic factor causes excretion of Na+ ions from renal tubules. Hence Antagonistic.
Relaxin secreted by ovary and placenta to relax the pelvic ligaments during parturition and Inhibin is secreted by male reproductive system sertoli cells which inhibit secretion of FSH and ICSH & Ovary to inhibit FSH. Hence, not Antagonistic.
Parathormone increases blood calcium level and Calcitonin decreases blood calcium levels. Hence, antagonistic.
Insulin is hypoglycaemic & Glucagon in hyperglyceamic hormone. Hence, antagonistic.
Aldosterone causes reabsorption of Na+ ions from renal tubules and Atrial Natriuretic factor causes excretion of Na+ ions from renal tubules. Hence Antagonistic.
Relaxin secreted by ovary and placenta to relax the pelvic ligaments during parturition and Inhibin is secreted by male reproductive system sertoli cells which inhibit secretion of FSH and ICSH & Ovary to inhibit FSH. Hence, not Antagonistic.
26018.Mitochondrial and chloroplast are:
(a) semi-autonomous organelles.
(b) formed by the division of pre – existing organelles and they contain DNA but lack protein synthesizing machinery.
Which one of the following options is correct?
(a) semi-autonomous organelles.
(b) formed by the division of pre – existing organelles and they contain DNA but lack protein synthesizing machinery.
Which one of the following options is correct?
Both (a) and (b) are false.
Both (a) and (b) are correct.
(b) is true but (a) is false.
(a) is true but (b) is false.
Explanation:
Mitochondria and chloroplast contain protein synthesizing machinery.
Mitochondria and chloroplast contain protein synthesizing machinery.
26019.Which of the following is not a feature of the plasmids?
Single – stranded
Independent replication
Circular structure
Transferable
Explanation:
Plasmid is double stranded, circular, self replicating and extra chromosomal DNA in bacterial cells.
Plasmid is double stranded, circular, self replicating and extra chromosomal DNA in bacterial cells.
26020.A plant in your garden avoids photorespiratory losses, has improved water use efficiency, shows high rates of photosynthesis at high temperatures and has improved the efficiency of nitrogen utilisation. In which of the following physiological groups would you assign this plant?
Nitrogen fixer
C3
C4
CAM
Explanation:
C4 plants like Maize and sugarcane can fix CO2 at high temperature and high intensity of light. Its productivity is high at higher intensity. Photorespiration is absent in these plants.
C4 plants like Maize and sugarcane can fix CO2 at high temperature and high intensity of light. Its productivity is high at higher intensity. Photorespiration is absent in these plants.
26021.Emerson’s enhancement effect and Red drop have been instrumental in the discovery of:
Oxidative phosphorylation
Photophosphorylation and non-cyclic electron transport
Two photosystems operating simultaneously
Photophosphorylation and cyclic electron transport
Explanation:
Red drop effect and enhancement effect have been instrumental in the discovery of PS-1 and PS-2 on the Thylakoid membranes of chloroplast.
Red drop effect and enhancement effect have been instrumental in the discovery of PS-1 and PS-2 on the Thylakoid membranes of chloroplast.
26022.Which type of tissue correctly matches with its location?
Tissue - Location
Tissue - Location
Cuboidal epithelium - Lining of stomach
Smooth muscle - Wall of intestine
Areolar tissue - Tendons
Transitional epithelium - Tip of nose
Explanation:
Wall of intestine composed of smooth mucle.
Tendon is dense regular white fibrous connective tissue and aerolar tissue is loose connective tissue.
Tip of nose is made up of elastic cartilage.
Lining of Stomach is lined with columnar epithelium.
Wall of intestine composed of smooth mucle.
Tendon is dense regular white fibrous connective tissue and aerolar tissue is loose connective tissue.
Tip of nose is made up of elastic cartilage.
Lining of Stomach is lined with columnar epithelium.
26023.When does the growth rate of a population following the logistic model equal zero? The logistic model is given as
dN/dt = rN(1 - N/K):
dN/dt = rN(1 - N/K):
when death rate is greater than birth rate.
when N/K is exactly one.
When N nears the carrying capacity of the habitat.
when N/K equals zero.
Explanation:
dN/dt = rN(l-N/K) is the Verhulst - Pearl logistic growth equation in which if N / k is exactly 1, (1-N/K) becomes zero that means growth is zero.
dN/dt = rN(l-N/K) is the Verhulst - Pearl logistic growth equation in which if N / k is exactly 1, (1-N/K) becomes zero that means growth is zero.
26024.Which one of the following statements is not true?
Stored pollen in liquid nitrogen can be used in the crop breeding programs
Tapetum helps in the dehiscence of anther
Exine of pollen grains is made up of sporopollenin
Pollen grains of many species cause severe allergies
Explanation:
Tapetum provides nutrition to the pollen grain.
Tapetum provides nutrition to the pollen grain.
26025.Which one of the following statements is wrong?
Phycomycetes are also called algal fungi.
Cyanobacteria are also called blue-green algae.
Golden algae are also called desmids.
Eubacteria are also called false bacteria.
Explanation:
Eubacteria are true bacteria.
Eubacteria are true bacteria.
26026.The Avena curvature is used for bioassay of:
Ethylene
ABA
GA3
IAA
Explanation:
Bio assay is an indirect method of estimating a biological compound by studying its physiological activity.
Bio assay is an indirect method of estimating a biological compound by studying its physiological activity.
26027.Which of the following structures is homologous to the wing of a bird?
Flipper of Whale
Dorsal fin of a Shark
Wing of a Moth
Hind limb of Rabbit
26028.Blood pressure in the pulmonary artery is:
less than that in the venae cavae.
same as that in the aorta.
more than that in the carotid.
more than that in the pulmonary vein.
26029.Fertilization in humans is practically feasible only if:
the sperms are transported into cervix within 48 hrs of the release of an ovum in a uterus.
the sperms are transported into the vagina just after the release of the ovum in the fallopian tube.
the ovum and sperms are transported simultaneously to ampullary – isthmic junction of the fallopian tube.
the ovum and sperms are transported simultaneously to ampullary – isthmic junction of the cervix.
26030.In meiosis crossing over is initiated at:
Diplotene
Pachytene
Leptotene
Zygotene
Explanation:
Leptotene - Condensation of Chromatin. Zygotene - Synapsis. Diplotene - Terminalisation.
Leptotene - Condensation of Chromatin. Zygotene - Synapsis. Diplotene - Terminalisation.
26031.Chrysophytes, Euglenoids, Dinoflagellates and Slime moulds are included in the kingdom:
Animalia
Monera
Protista
Fungi
Explanation:
Protista is a group created by Haeckel which includes all Eukaryotic unicellular organisations.
Protista is a group created by Haeckel which includes all Eukaryotic unicellular organisations.
26032.Lack of relaxation between successive stimuli in sustained muscle contraction is known as:
Tonus
Spasm
Fatigue
Tetanus
26033.Identify the correct statement on ‘inhibin’:
Is produced by nurse cells in testes and inhibits the secretion of LH.
Inhibits the secretion of LH, FSH and Prolactin.
Is produced by granulose cells in ovary and inhibits the secretion of FSH.
Is produced by granulose cells in ovary and inhibits the secretion of LH.
26034.Name the chronic respiratory disorder caused mainly by cigarette smoking:
Respiratory alkalosis
Emphysema
Asthma
Respiratory acidosis
Explanation:
Emphysema is a chronic respiratory disorder caused due chronic cigarette smoking in which alveolar walls
are damaged due to which respiratory surface is decreased.
Emphysema is a chronic respiratory disorder caused due chronic cigarette smoking in which alveolar walls
are damaged due to which respiratory surface is decreased.