MCQOPTIONS
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MCQOPTIONS
This section includes 5751 Mcqs, each offering curated multiple-choice questions to sharpen your Biology knowledge and support exam preparation. Choose a topic below to get started.
| 1751. |
Animals which cannot maintain thier osmotic environment at a constant level are called |
| A. | Osmoregulators |
| B. | Oamoconfirmers |
| C. | Pokilotherms |
| D. | Homeotherms |
| Answer» C. Pokilotherms | |
| 1752. |
The blood constituents that remain unchanged in quality after circulating through the kidneys are... |
| A. | Urea and glucose |
| B. | Glucose and proteins |
| C. | Urea and proteins |
| D. | Urea and uric acid |
| Answer» C. Urea and proteins | |
| 1753. |
The appearance of albumin in the urine is most likely due to.. |
| A. | Increase is blood pressure |
| B. | Decrease in the blood osmotic pressure |
| C. | Damage to the Malpighian corpuscles |
| D. | Damage to the PCT |
| Answer» D. Damage to the PCT | |
| 1754. |
The renal vain carries bloood |
| A. | Towards liver |
| B. | Into the kidney |
| C. | Away from the kidney |
| D. | Towards urinary blodder |
| Answer» D. Towards urinary blodder | |
| 1755. |
Ascending loop if henle is perrneable to: |
| A. | K+ |
| B. | Cl- |
| C. | Na+ |
| D. | All of above |
| Answer» E. | |
| 1756. |
How gibberrelin accelerates seed germination ? (AIIMS 2005) |
| A. | By effecting rate of cell division |
| B. | By the synthesis of digestive juice |
| C. | Abscisic acid |
| D. | Absorption of water from hard seed coat |
| Answer» C. Abscisic acid | |
| 1757. |
Proboscis gland is balanoglossus is associated with |
| A. | Digestion |
| B. | Excretion |
| C. | Circulation |
| D. | Respiration |
| Answer» C. Circulation | |
| 1758. |
Which hormone is synthesized by root and endosperm? |
| A. | Auxin |
| B. | Cytokinin |
| C. | Gibberrelin |
| D. | Ethylene |
| Answer» C. Gibberrelin | |
| 1759. |
Which of the following should be used for the control of weeds in farms ? |
| A. | Cytokinin |
| B. | Auxin |
| C. | Gibberrelin |
| D. | Ethylene |
| Answer» C. Gibberrelin | |
| 1760. |
What is the colour of Phytochrome pigment ? |
| A. | Yellowish green |
| B. | Bluish |
| C. | Red |
| D. | Pink |
| Answer» B. Bluish | |
| 1761. |
From where indole acetic acid an organic substance was isolated for the first time ? |
| A. | Animal fat |
| B. | Gibberrela |
| C. | Human urine |
| D. | Fish |
| Answer» D. Fish | |
| 1762. |
Which type of meristematic tissue is found in monocot plant for growth ? |
| A. | Intercalary meristematic tissue |
| B. | Apical meristem tissue |
| C. | Lateral meristem tissue |
| D. | Meristematic tissue |
| Answer» B. Apical meristem tissue | |
| 1763. |
Growth regulators are chemically ........ |
| A. | Organic chemical |
| B. | Inorganic chemicals |
| C. | Minerals |
| D. | Vitamins |
| Answer» B. Inorganic chemicals | |
| 1764. |
Which hormone is responsible for bolting ? |
| A. | Auxin |
| B. | Cytokinin |
| C. | Gibberrelin |
| D. | Ethylene |
| Answer» D. Ethylene | |
| 1765. |
By which reaction growth of cuscuta occurs on host plant ? |
| A. | Thigmotropism |
| B. | Chemtropism |
| C. | Thigmonasty |
| D. | Photonasty |
| Answer» B. Chemtropism | |
| 1766. |
Which of the following is increased in plants as a result of growth ? |
| A. | Dry volume |
| B. | Width |
| C. | Number |
| D. | Dry weight |
| Answer» E. | |
| 1767. |
What is responsible for opening and closing of tulip flower ? |
| A. | Photonastic movement |
| B. | Geotropism |
| C. | Thermonasty |
| D. | Nictinasty |
| Answer» D. Nictinasty | |
| 1768. |
Which of the following is criteria for measurement of growth ? |
| A. | Number |
| B. | Weight |
| C. | Volume |
| D. | All a, b, c |
| Answer» C. Volume | |
| 1769. |
From where auxin was isolated for the first time ? |
| A. | Coleoptile of oat |
| B. | Sperm cell of herring fish |
| C. | Paddy plant |
| D. | Human urine |
| Answer» E. | |
| 1770. |
Which of the following reaction is observed in droping of drocera due to insects ? |
| A. | Thigmonasty |
| B. | Chemotropis |
| C. | Photonasty |
| D. | Thigmotropism |
| Answer» B. Chemotropis | |
| 1771. |
What is the reason of senescence leaf ? |
| A. | Ethylene |
| B. | Abscisic acid |
| C. | cytokinin |
| D. | Auxin |
| Answer» C. cytokinin | |
| 1772. |
Which of the following organic substance is growth inhibitor ? |
| A. | IBA |
| B. | ABA |
| C. | IAA |
| D. | GA |
| Answer» C. IAA | |
| 1773. |
Which hormone reduces the dominance of apical bud ? |
| A. | Auxin |
| B. | ABA |
| C. | Ethylene |
| D. | Cytokinin |
| Answer» D. Cytokinin | |
| 1774. |
Which apparatus is used for exact measuring of growth of plants in longitudinal axis ? |
| A. | Measuring scale |
| B. | Auxanometer |
| C. | Manometer |
| D. | Sphigomanometer |
| Answer» B. Auxanometer | |
| 1775. |
Which hormone is responsible for growth of leaf-apex ? |
| A. | IAA |
| B. | Zeatin |
| C. | Gibberrelin |
| D. | Ethylene |
| Answer» B. Zeatin | |
| 1776. |
Cytokinin is formed in which of the following region ? |
| A. | Region of cell elongation |
| B. | Regions of senescence |
| C. | Regions of cell division |
| D. | Regions of abscission |
| Answer» D. Regions of abscission | |
| 1777. |
In which phase of growth size of vacuole increases ? |
| A. | Cell formation |
| B. | Cell elongation |
| C. | cell difterentiation |
| D. | Cell transfer |
| Answer» C. cell difterentiation | |
| 1778. |
Which chemical induces formation of adventitious roots ? |
| A. | Gibberrelin |
| B. | IAA |
| C. | Abscisic acid |
| D. | Cytokinins |
| Answer» C. Abscisic acid | |
| 1779. |
Which is incorrect for the effects of auxin ? |
| A. | Induces +ve phototropism |
| B. | Induces growth and length in stem |
| C. | Shows apical dominance |
| D. | Induces -ve phototropism in roots |
| Answer» C. Shows apical dominance | |
| 1780. |
What is the optimum temperature for growth of the plants ? |
| A. | 25 to 30oC |
| B. | 28 to 30oC |
| C. | 0 to 30oC |
| D. | 0 to 28oC |
| Answer» C. 0 to 30oC | |
| 1781. |
Embryo develops from |
| A. | Egg cell |
| B. | Zygote |
| C. | Egg-apparatus |
| D. | Synergids |
| Answer» C. Egg-apparatus | |
| 1782. |
The uppermost and largest cell of the suspensor which remains in contact with apical cells is called |
| A. | Hypocotyl |
| B. | Basal cell |
| C. | Hypophysis |
| D. | Terminal cell |
| Answer» D. Terminal cell | |
| 1783. |
How can a biannual plant be converted into an annual plant? |
| A. | By cold process of seeds |
| B. | By giving more light |
| C. | By giving more oxygen |
| D. | By giving more temperature |
| Answer» B. By giving more light | |
| 1784. |
Cross pollination is normally |
| A. | not beneficial |
| B. | harmful |
| C. | more beneficial |
| D. | rarely seen |
| Answer» D. rarely seen | |
| 1785. |
The adaptation for self-pollination is |
| A. | Herkogamy |
| B. | Cleistogamy |
| C. | Dichrgamy |
| D. | Homogamy |
| Answer» C. Dichrgamy | |
| 1786. |
An anther is also called |
| A. | Sporangium |
| B. | Megasporangium |
| C. | Microsporangium |
| D. | Stamen |
| Answer» D. Stamen | |
| 1787. |
Which of the following is the basal part of ovule ? |
| A. | placenta |
| B. | Hilum |
| C. | Micropyle |
| D. | chalaza |
| Answer» E. | |
| 1788. |
Which part of the male gametophyte, disintegrates before fertilization ? |
| A. | Generative nucleu |
| B. | Tube nucleus |
| C. | Male gamete |
| D. | Germpore |
| Answer» C. Male gamete | |
| 1789. |
2 to 3 celled male gametophyte, starts its further development after pollination |
| A. | In the style |
| B. | In the ovary |
| C. | on the stigma |
| D. | In the ovule |
| Answer» D. In the ovule | |
| 1790. |
Pollen tube enters the micropyle into through |
| A. | Female gamet |
| B. | Ovary |
| C. | Female gametophyte |
| D. | Nucellus |
| Answer» D. Nucellus | |
| 1791. |
The source of food for developing embryo is |
| A. | Nucellu |
| B. | Ovule |
| C. | Endosperm |
| D. | Anther |
| Answer» D. Anther | |
| 1792. |
The larger cell of a pollen grain with irregular shaped nucleus is |
| A. | Apical cell |
| B. | Generative cell |
| C. | Vegetative cel |
| D. | Basal cell |
| Answer» D. Basal cell | |
| 1793. |
Development of male gametophyte begins |
| A. | After pollinatio |
| B. | Before pollination |
| C. | On the stigma |
| D. | In the embryo sac |
| Answer» C. On the stigma | |
| 1794. |
Out of megaspore tetrad, the functional megaspore is |
| A. | Any megaspore |
| B. | middle megaspore |
| C. | Micropylar megaspore |
| D. | Chalazal megaspore |
| Answer» E. | |
| 1795. |
How many megaspore mothe cell are produced in a nucellus ? |
| A. | 3 |
| B. | 1 |
| C. | 2 |
| D. | 4 |
| Answer» C. 2 | |
| 1796. |
Suspensor is produced from |
| A. | Apical cell |
| B. | Small upper basal cell |
| C. | large lower basal cell |
| D. | Hypophysis |
| Answer» C. large lower basal cell | |
| 1797. |
How many cells are formed in a mature female gametophyte ? |
| A. | Eight |
| B. | Six |
| C. | Two |
| D. | Seven |
| Answer» E. | |
| 1798. |
In ficus pollination occurs through |
| A. | Water |
| B. | Air |
| C. | Bat |
| D. | Insects |
| Answer» E. | |
| 1799. |
Fertilized secondary necleus develops into |
| A. | Fruit |
| B. | Embryo |
| C. | seed |
| D. | Endosperm |
| Answer» E. | |
| 1800. |
Transfer of pollen to the stigma is called |
| A. | Fertilization |
| B. | Germination |
| C. | pollination |
| D. | Gametogenesis |
| Answer» D. Gametogenesis | |