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Answer : (a) Chylomicron

The percentage of lipoprotein is maximum in chylomicrons. 

Chylomicrons transport lipids absorbed from the intestine to various tissues, where their triglyceride components are hydrolysed by the activity of the lipoprotein lipase, allowing the released free fatty acids to be absorbed by the tissues.

Answer : (b) Digeorges’ syndrome 

Digeorges’ Syndrome (DGS) also called as thymic aplasia occurs because of the deficiency of T-cells. DGS is caused by abnormal formation of certain tissues during the foetal development.

Answer : (b) Agrobacterium tumefaciens

Agrobacterium tumefaciens, a pathogen of several dicot plants is able to deliver a piece of DNA, known as T-DNA, to transform normal plant cells into a tumour cell and direct these tumour cells to produce the chemicals required by the pathogen. The Ti plasmid of Agrobacterium tumefaciens has now been modified into a cloning vector which is no more pathogenic to the plants. It is able to deliver the genes of our interest into a variety of plants.

Correct option (b) T₁ < T₂

Explanation:

 Higher is the termperature, greater is the most probable velocity.

Correct option (b) clockwise

Explanation:

 As magnet is withdrawn from the coil, field into the coil decreases. To increase this field, current induced in the coil must be clockwise as seen by the withdrawing magnet.

Correct option (b) 0.9 A

Correct Option(c) Starch synthesis in pea - Multiple alleles

Explanation: 

In the given pairs, option (c) is wrongly matched. Starch synthesis in pea is an example of pleiotropy. A pleiotropic gene is a single gene which produces many or multiple unrelated phenotypes. Rest of the pairs are correctly matched.

Concept Enhancer The gene for starch.synthesis in pea seeds has two alleles B and b. In BB genotype, large starch grains are produced. After maturation the seeds are round. In bb homozygous condition, smaller search grains are produced and nature seeds are wrinkled. Bb heterozygotes form round seeds so that B seems to be dominant allele. However, Bb seeds have starch grains of intermediate size, showing incomplete dominance.

Answer is : (a) chemicals produced by a species which affects other species

Allochemicals are chemicals produced by a species which affects other species, e.g. Chlorella, a common alga, produces a bacteriocide that not only kills bacteria but also retards the growth of Daphnia, which feeds on Chlorella.

The option (c) is correctly matched.

Mucous neck cells and oxyntic cells present in the gastric glands secrete mucus and HCl, respectively. β - cells of the islets of Langerhans secrete insulin which reduces the blood sugar level.

Answer is : (d) III and IV

The statement III and IV are incorrect. Urethra serves as a common passage for semen and urine. Storage of urine is a function of urinary bladder. The loop of Henle plays a major role in conserving water.

Correct Option  (a) 256, 0, 97 ,404 

Correct option (b) liquid dispersed in gas

Explanation:

Metal-metal bonding is more frequency in 4d or 5d due to greater enthalpy of atomisation.

Correct option [a] megasporangium 

Correct option [b] isidium 

Correct option [c] gibberellin and cytokinin

Correct option [b] velamen 

Correct option [b] organ of Bojanus

Correct Option (a) epimer 

Explanation :

D-mannose and D-glucose differ at configuration at C–2 only hence they are epimer.

Correct option (b) 4 and 8    

Explanation:

Antifluoride structure has opposite arrangement of inos than fluorite structure.

For antifluorite structure

Coordination number of cation = 4

Coordination number of anion = 8

Correct Option (b) interacts with a specific type of substrate molecule

Correct Option  (b) Purine metabolism.

Correct Option (d) thymine

Correct Option (c) no exchange of water takes place

Answer is : (c) Sand boa

Eryx johnii (Sand boa) is a double-headed snake. It has a small, non-prehensile thick tail bearing a resemblance to head. It is a species of non-venomous snake in the subfamily Erycinae of the family Boidae. It is adapted to burrowing so, the head is wedge-shaped.

Answer is : (d) Palaearctic and Oriental

Himalayan ranges separate Palaearctic and Oriental regions.

Answer is : (d)

Craidukov’s phenomenon is the capacity of changing colour according to the wavelength of incident light. It is exhibited by species that develop green shades in red light, brownish-yellow in blue light, etc. It is also known as chromatic adaptation.

Answer is : (b)

Lysozymes present in the saliva act as an antibacterial agent that prevent infections.

The correct option is (c) electrons move from base to collector.

Explanation:

In n-p-n transistor, the electrons are majority, carriers in emitter, which more from base to collector while using n-p-n transistor as an amplifier.

Answer is : (a) 9 + 2 pattern

Both flagella and cilia have a 9 + 2 arrangement of microtubules. Dynein ‘arms’ attached to the microtubules serve as the molecular motors.

Correct Option (b) Both A and R are true, but Ris not the correct explanation of A. 

Correct Option (a) A–D loop; B–Anticodon arm; C–TYC arm; D–CCA acceptor arm 

Correct Option (c) Ribozymes — Protein with catalytic activity 

Correct Option (b) Meissner's corpuscles

Correct Option(1) Retrovirus

Explanation:

Usually, a retrovirus is used as a vector for introducing a DNA fragment in human cells. They have used as a vector in gene therapy to introduce the desired gene so as to replace the functioning of a defected gene e.g. Severe Combined Immune.

Deficiency (SCID) is caused due to a defect in the gene for the enzyme adenosine deaminase.

In gene therapy against it, lymphocytes are extracted from the bone marrow of the patient. These are grown in a culture outside the body. A functional ADA rDNA, using a retroviral vector, is then introduced into these lymphocytes. These are reinjected into the patient's bone marrow.

λ-phage allows cloning of DNA fragments upto 23 kb lengths. Ti-plasmid is usually used for plants. pBR-322 is an artificial cloning vector, usually used for bacteria.

Answer is :  (c) \(\frac{l}{4}\)

If I₀ is the intensity after closing one slit, then it satisfies

I₀ ∝ a²

(where, a = amplitude of light wave)

When both slits open, then intensity

∴ l ∝ (2a)² = 4a²

⇒ l₀ = \(\frac{l}{4}\)

Answer is : (a) IBA

IBA or Indole-3 butyric acid, is a plant hormone in auxin family. It is an ingredient in many commercial horticulture plant rooting products because stem cuttings of some plants do not produce roots readily and have to be treated with a root promoting hormone such as IAA, IBA, etc.

Correct Option (d) 6

Correct Option (C)

Answer is : (d) pectinase and cellulase

In protoplast fusion, tissues of two different plants are cultured. Their cells are separated and treated with pectinase and cellulase to produce naked protoplast which are then made to fuse by electrofusion.

Answer is : (c) 36

The number of chromosomes in leaf cells is 24 (2n) . Aleurone cells are the part of endosperm which is triploid in nature. Therefore, the number of chromosomes in it would be 36 (3n).

Cavity of medulla oblongata is also known as Matacoel.

Explanation: 

Third Ventricle of Brain is known as Diocoel, Fourth Ventricle is known as Metacoel. These are connected by a Sylvius Aqueduct, also know as iter. Metacoel continues into neurocoel which is the cavity of spinal cord. First and Second Ventricles are known as Lateral Ventricles and also Paracoel. Both the Paracoel combine with each other and open into diencephalon through Foramen of Munro.

Little extra: There are in total three aperture found on the surface of Metacoel On the dorsal surface, there is Foramen of Magendie, on Lateral surface there is Foramen of Luscha(×2). These allow CSF from Ventricles to open into subarachnoid space.

The correct answer is (4)

Inbreeding increases homozygosity. So, mating of the related individuals of same breed will give homozygous purelines.

The correct answer is (3)

The vertebrates process myogenic heart which is self contractile system or autoexcitable; it will thus keep working outside the body for some time.

The correct answer is (2)

Heartwood is inactive physiologically due to deposition of organic compounds and formation of tyloses so it will not conduct water and minerals

Human fertilization is a complicated process that results in a fertilized egg. The fertilized egg will mature in the womb of its mother until birth.

In human female the site of fertilization is oviduct or fallopian tube.

Answer is : (b)

At position,

1 – The proton motive force is generated, powering ATP synthesis.

2 – Krebs cycle occurs oxidising two molecules of acetyl Co - A.

3 – Electron transport chain occurs coupled to proton transport across the inner membrane.

Correct Option (b) Cardiac system (cardo-vascular system) 

Correct Option (b) molecular marker 

Correct Option (c) Taxol 

Correct Option (d) Flavr savr tomato