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Engineering
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Parts A,B,C and D of the human eye are shown in the diagram. Select the option which gives correct identification along with its functions/characteristics:

  • Option 1)

    D - Choroid - its anterior part forms ciliary body.

  • Option 2)

    A - Retina - contains photo receptors - rods and cones.

  • Option 3)

    B - Blind spot - has only a few rods and cones.

  • Option 4)

    C- Aqueous chamber -reflects the light which does not pass through the lens.

 
  Retina - The inner layer is the retina and it contains three layers of neural cells.  - wherein from inside to outside – ganglion cells, bipolar cells and photoreceptor cells.     Option 1) D - Choroid - its anterior part forms ciliary body. This solution is incorrect  Option 2) A - Retina - contains photo receptors - rods and cones. This solution is correct  Option 3) B - Blind spot - has...
Engineering
89 Views   |  

Which of the following statements is correct in relation to the endocrine system?

  • Option 1)

    Releasing and inhibitory hormones are produced by the pituitary gland.

  • Option 2)

    Adenohypophysis is under direct neural regulation of the hypothalamus.

  • Option 3)

    Organs in the body like gastrointestinal tract, heart, kidney and liver do not produce any hormones.

  • Option 4)

    Non - nutrient chemicals produced by the body in trace amount that act as intercellular messenger are known as hormones.

 
  Hormones - Hormones are non-nutrient chemicals which act as intercellular messengers and are produced in trace amounts. - wherein According to the new definition, Hormonescovers a number of new molecules in addition to the hormones secreted by the organised endocrine gland     Option 1) Releasing and inhibitory hormones are produced by the pituitary gland. This is incorrect option Option...
Engineering
308 Views   |  

Figure shows human urinary system with structures labelled A to D. Select option which correctly identifies them and gives their characteristics and/or functions.

  • Option 1)

    D - Cortex - outer part of kidney and do not contain any part of nephrons.

  • Option 2)

    A - Adrenal gland - located at the anterior part of kidney. Secrete Catecholamines which stimulate glycogen breakdown.

  • Option 3)

    B - Pelvis - broad funnel shaped space inner to hilum, directly connected to loops of Henle.

  • Option 4)

    C - Medulla - inner zone of kidney and contains complete nephrons.

 
As we learnt Human Excretory System - The human the excretory system consists of a pair of kidneys, one pair of ureters, a urinary bladder and a urethra. - wherein    Diagram is showing all the parts of system. Correct answer is Adrenal gland. Option 1) D - Cortex - outer part of kidney and do not contain any part of nephrons. incorrect Option 2) A - Adrenal gland - located at the anterior...
Engineering
261 Views   |  

Figure shows schematic plan of blood circulation in humans with labels A to D. Identify the label and give its function/s.

  • Option 1)

    D - Dorsal aorta - takes blood from heart to body parts, PO2 = 95 mm Hg

  • Option 2)

    A - Pulmonary vein - takes impure blood from body parts, PO2 = 60 mm Hg

  • Option 3)

    B- Pulmonary artery -takes blood from heart to lungs, PO= 90 mm Hg

  • Option 4)

    C - Vena Cava - takes blood from body parts to right auricle, PCO= 45 mm Hg

 
  Functioning of the heart - To begin with, all the four chambers of heart are in a relaxed state, i.e., they are in joint diastole. - wherein As the tricuspid and bicuspid valves are open, blood from the pulmonary veins and vena cava flows into the left and the right ventricle respectively through the left and right atria.     Partial pressures of these O2 and CO2 in the atmospheric air and...
Engineering
195 Views   |  

Which of the following criteria does not pertain to facilitated transport?

  • Option 1)

    Uphill transport

  • Option 2)

    Requirement of special membrane proteins

  • Option 3)

    High selectivity

  • Option 4)

    Transport saturation

 
As we learnt in Faciliated diffusion - Movement of particles along concentration gradient, mediated by a carrier - wherein Passive transport, no energy is required    Facilitated diffusion is a downhill transport. Option 1) Uphill transport Correct Option 2) Requirement of special membrane proteins Incorrect Option 3) High selectivity Incorrect Option 4) Transport saturation Incorrect
Engineering
353 Views   |  

The first stable product of fixation of atmospheric nitrogen in leguminous plants is:

  • Option 1)

    Glutamate

  • Option 2)

    \text{NO}_{2}^{-}

  • Option 3)

    Ammonia

  • Option 4)

    \text{NO}_{3}^{-}

 

Ammonia

Engineering
205 Views   |  

Lenticels are involved in:

  • Option 1)

    Photosynthesis

  • Option 2)

    Transpiration

  • Option 3)

    Gaseous exchange

  • Option 4)

    Food transport

 
As we discussed in concept Lenticular transpiration results in release of water vapour. Option 1) Photosynthesis This option is incorrect. Option 2) Transpiration This option is incorrect. Option 3) Gaseous exchange This option is correct. Option 4) Food transport This option is incorrect.
Engineering
306 Views   |  

During seed germination its stored food is mobilized by:

  • Option 1)

    Gibberellin

  • Option 2)

    Ethylene

  • Option 3)

    Cytokinin

  • Option 4)

    ABA

 
As discussed in Function of Gibberellins - Internodes elongation Bolting Promotes seed germination Promotes flowing in long day plants and inhibit it in short day plants. Delay Senescene Induce parthenocarpy in pome fruits Break bud and seed dormancy  - wherein Commercially used to increase yield of malt from barley.    Gibberellins promotes seed germination and secretes enzyme to break...
Engineering
225 Views   |  

What external changes are visible after the last moult of a cockroach nymph?

  • Option 1)

    Labium develops

  • Option 2)

    Mandibles become harder

  • Option 3)

    Anal cerci develop

  • Option 4)

    Both fore wings and hind wings develop

 
As we discussed in Development in cockroach - The development of P.americana is paurometabolous (Development through nymphal stage). The lymph grows by moulting about 13 times to reach the adult form. The next to last nymphal stage has wing pads but only adult cockroaches have wings. Nymph lacks wings -    Cockroach nymph growth by moulting. Last moulting results in development of...
Engineering
102 Views   |  

Interfascicular cambium develops from the cells of:

  • Option 1)

    Pericycle

  • Option 2)

    Medullary rays

  • Option 3)

    Xylem parenchyma

  • Option 4)

    Endodermis

 
As we learnt in Formation of vascular cambium ring is dicot stem - Formation of vascular cambium ring is dicot stem :- (a) Intrafascicular cambium- It is primary in origin present in between primary phloem and primary system. (b) Interfascicular cambium- It is secondary meinstem. It originates from porenchyma cells of medullary ray region and lies between the vascular bundles. (c) Vascular...
Engineering
501 Views   |  

In china rose the flowers are:

  • Option 1)

    Zygomorphic, epigynous with twisted aestivation

  • Option 2)

    Actinomorphic, hypogynous with twisted aestivation

  • Option 3)

    Actinomorphic, epigynous with valvate aestivation

  • Option 4)

    Zygomorphic, hypogynous with imbricate aestivation

 
As discussed in Actinomorphic flower - When a flower can be divided into two equal halves by many vertical sections passing through the center called actinomorphic or radial - wherein eg: cruciferae, malvaceae   And,   Types of Aestivation - (1) Valvate - when sepals or petals lie very close to each other without over lapping eg: mustard , calotropis (2)  Twisted Aestivation - when one margin...
Engineering
104 Views   |  

Which one of the following statements is correct?

  • Option 1)

    Tapetum nourishes the developing pollen

  • Option 2)

    Hard outer layer of pollen is called intine

  • Option 3)

    Sporogenous tissue is haploid

  • Option 4)

    Endothecium produces the microspores

 

dryopithecus   

Engineering
116 Views   |  

Which one of the following is not the function of placenta ? It:

  • Option 1)

    secretes oxytocin during parturition.

  • Option 2)

    facilitates supply of oxygen and nutrients to embryo.

  • Option 3)

    secretes estrogen.

  • Option 4)

    facilitates removal of carbon dioxide and waste material from embryo.

 
As learnt in Sperms - Sperms released from the seminiferous tubules, are transported by the accessory ducts. Secretions of epididymis, vas deferens, seminal vesicle and prostate are essential for maturation and motility of sperms. maturation and motility of sperms.  - wherein The human male ejaculates about 200 to 300 million sperms during a coitus of which, for normal fertility, at least 60...
Engineering
628 Views   |  

What is the correct sequence of sperm formation?

  • Option 1)

    Spermatogonia, spermatocyte, spermatid, spermatozoa

  • Option 2)

    Spermatid, spermatocyte, spermatogonia, spermatozoa

  • Option 3)

    Spermatogonia, spermatocyte, spermatozoa, spermatid

  • Option 4)

    Spermatogonia, spermatozoa, spermatocyte, spermatid

 
As learnt in Spermatogenesis - In testis, the immature male germ cells (spermatogonia) produce sperms by spermatogenesis. - wherein spermatogenesis begins at puberty    Spermatogenesis is the process of sperm formation. It occurs in the following sequence.   Option 1) Spermatogonia, spermatocyte, spermatid, spermatozoa correct option Option 2) Spermatid, spermatocyte, spermatogonia,...
Engineering
186 Views   |  

Product of sexual reproduction generally generates:

  • Option 1)

    Large biomass

  • Option 2)

    Longer viability of seeds

  • Option 3)

    Prolonged dormancy

  • Option 4)

    New genetic combination leading to variation

 
As discussed in Advantages of seeds to angiosperms - 1. reproductive processes such as pollination and fertilisation are independent of water, seed formation is more dependable 2. seeds have better adaptive strategies for dispersal to new habitats and help the species to colonise in other areas 3. The hard seed coat provides protection to the young embryo 4. Being products of sexual...
Engineering
488 Views   |  

One of the legal methods of birth control is:

  • Option 1)

    by a premature ejaculation during coitus

  • Option 2)

    abortion by taking an appropriate medicine

  • Option 3)

    by abstaining from coitus from day 10 to 17 of the menstrual cycle

  • Option 4)

    by having coitus at the time of day break

 
As we learnt in concept Natural methods to avoid fertilisation - Natural methods work on the principle of avoiding chances of ovum and sperms meeting. - wherein e.g., Periodic abstinence is one such method in which the couples avoid or abstain from coitus from day 10 to 17 of the menstrual cycle when ovulation could be expected.    Pregnancy could be avoided by abstaining from coitus from day...
Engineering
78 Views   |  

Menstrual flow occurs due to lack of:

  • Option 1)

    Vasopressin

  • Option 2)

    Progesterone

  • Option 3)

    FSH

  • Option 4)

    Oxytocin

 
Engineering
890 Views   |  

Megasporangium is equivalent to:

  • Option 1)

    Ovule

  • Option 2)

    Embryo sac

  • Option 3)

    Fruit

  • Option 4)

    Nucellus

 
Ad discussed in The Megasporangium (Ovule) - The megasporangia, commonly called ovules, is a small structure attached to the placenta by means of a stalk called funicle. The body of the ovule fuses with funicle in the region called hilum. Thus, hilum represents the junction between  ovule and funicle.  - wherein    Megasporangium in an ovule. Option 1) Ovule This solution is correct  Option...
Engineering
108 Views   |  

Artificial insemination means:

  • Option 1)

    introduction of sperms of a healthy donor directly into the ovary

  • Option 2)

    transfer of sperms of a healthy donor to a test tube containing ova

  • Option 3)

    transfer of sperms of husband to a test tube containing ova

  • Option 4)

    artificial introduction of sperms of a healthy donor into the vagina

 
  Artificial insemination (AI) - Infertility cases either due to inability of the male partner to inseminate the female or due to very low sperm counts in the ejaculates, could be corrected by artificial insemination (AI) technique - wherein In this technique, the semen collected either from the husband or a healthy donor is artificially introduced either into the vagina or into the uterus...
Engineering
132 Views   |  

Advantage of cleistogamy is:

  • Option 1)

    Vivipary

  • Option 2)

    Higher genetic variability

  • Option 3)

    More vigorous offspring

  • Option 4)

    No dependence on pollinators

 
  Cleistogamous Flowers - In such flowers, the anthers and stigma lie close to each other. When anthers dehisce in the flower buds, pollen grains come in contact with the stigma to effect pollination. - wherein Cleistogamous flowers are invariably autogamous as there is no chance of cross-pollen landing on the stigma. Cleistogamous flowers produce assured seed-set even in the absence of...
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