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- Question 1 of 50
The substrate of photo-respiration is:
The substrate of photo-respiration is glycolate. Photorespiration is the chemical processes that occur within a living organism of phospho-glycolate that is produced during oxygenation catalyzed by the enzyme RubisCO and inhibits photosynthesis by interfering with CO2 fixation by RubisCO.
- Question 2 of 50
Which one of the following is the infective stage of the Malarial Parasite?
Sporozoite is the infective stage of the Malarial Parasite. Malaria infection begins when an infected female Anopheles mosquito bites a person, injecting Plasmodium parasites, in the form of sporozoites, into the bloodstream. The sporozoites pass quickly into the human liver. The sporozoites multiply in the liver cells, causing no symptoms.
- Question 3 of 50
Match the following:
A. Chlorophyll 1. Plant disease B. Nostoc 2. Photosynthetic pigment C. Transpiration 3. Diazotroph D. Rust of wheat 4. Loss of water from plant surface
Chlorophyll – Photosynthetic pigment, Nostoc – Diazotroph (bacteria), Transpiration – Loss of water from plant surface, Rust of wheat – Plant disease (fungal disease of wheat).
- Question 4 of 50
Which one of these animals is jawless?
Myxine is a species of hagfish. It has a jawless, lipless mouth that is star-shaped when closed. At the tip of the snout it has a single nasal aperture.
- Question 5 of 50
Competition for food, light and space is most severe in:
Competition for food, light and space is most severe in closely related species growing in the same area or niche. It is most severe in closely related species growing in the same habitat as these species will have the same niche, type of food they eat and same characteristics, etc.
- Question 6 of 50
An ecosystem consists of:
An ecosystem consists of a biotic community and its non-living elements. It consists of all the organisms and the physical environment with which they interact. These biotic and abiotic components are linked together through nutrient cycles and energy flows.
- Question 7 of 50
Aflatoxins are produced by:
Aflatoxins are produced by fungi. They are a family of toxins produced by certain fungi that are found on agricultural crops such as maize (corn), peanuts, cottonseed, and tree nuts.
- Question 8 of 50
Match the following:
A. Ascorbic acid 1. Photosynthetic pigment B. Chlorophyll 2. Quencher C. Carotenoid 3. Enzyme D. Superoxide dismutase 4. Vitamin-C
Ascorbic acid – Vitamin-C, Chlorophyll – Photosynthetic pigment, Carotenoid – Quencher, Superoxide dismutase – Enzyme. Superoxide dismutase (SOD) is an enzyme found in all living cells.
- Question 9 of 50
The maximum fixation of solar energy is done by:
The maximum fixation of solar energy is done by green plants. Between 98 and 99 percent of solar energy reaching Earth is reflected from leaves and other surfaces and absorbed by other molecules, which convert it to heat.
- Question 10 of 50
Animal protein is called first-class protein because it is:
Animal protein is called first-class protein because it is rich in essential amino acids. It is superior to plant protein because animal proteins contain a broad spectrum of amino acids with more vitamins and minerals than plant proteins.
- Question 11 of 50
Outside the nucleus DNA is found in:
Outside the nucleus, DNA is found in Mitochondria. Most DNA is located in the cell nucleus (where it is called nuclear DNA), but a small amount of DNA can also be found in the mitochondria (where it is called mitochondrial DNA).
- Question 12 of 50
Allantois of Embryo helps in:
Allantois of Embryo helps in excretion. The allantois is a hollow sac-like structure filled with clear fluid that forms part of a developing amniote’s conceptus (which consists of all embryonic and extra-embryonic tissues). It helps the embryo exchange gases and handles liquid waste.
- Question 13 of 50
Which one of the following animals belongs to Mollusca?
Haliotis belongs to Mollusca. Mollusca is the second-largest phylum of invertebrate animals after the Arthropoda. It is sluggish invertebrates, with a thin fleshy envelope or mantle covering the visceral organs. Molluscs include mussels, scallops, oysters, periwinkles, whelks, squid, clams, snails, haliotis and octopus.
- Question 14 of 50
Photoperiodism (Photo means light and period means length of time) affects Vegetative growth, Flowering and Fruiting. Photoperiodism is the developmental responses of plants to the relative lengths of light and dark periods. It affects the vegetative growth as well as the time of flowering and fruiting in plants.
- Question 15 of 50
Molybdenum deficiency affects the activity of:
Molybdenum deficiency affects the activity of nitrate reductase. Without sufficient molybdenum plants accumulate nitrate in their leaves, but cannot use it to make proteins for normal growth. The plant becomes stunted and the leaves show symptoms of nitrogen deficiency, appearing pale green or yellowish-green in colour between the veins.
- Question 16 of 50
Which one of the following is the correct sequence of ecosystem in the order of decreasing productivity?
The plant life in an ecosystem supports animal life and vice versa. Mangroves are a group of trees and shrubs that live in the coastal intertidal zone. Thus the correct sequence of ecosystem in the order of decreasing productivity is Ocean, mangroves, lakes and grasslands.
- Question 17 of 50
Xenobiotics which are inherently resistant to microbial attack are called as:
Xenobiotics which are inherently resistant to microbial attack are called as Recalcitrant.
- Question 18 of 50
Cyanide poisoning causes death in seconds because:
Cyanide poisoning causes death in seconds because it breaks the electron transport chain. Cyanide blocks the cellular electron transport mechanism and cellular respiration by inhibiting the mitochondrial ferricytochrome oxidase system and other enzymes.
- Question 19 of 50
When one gene pair hides the effect of the other unit. The phenomenon is referred to as:
When one gene pair hides the effect of the other unit. The phenomenon is referred to as epistasis. Epistasis is the interaction between two non-linked genes which causes one gene to mask the expression of the other in the phenotype.
- Question 20 of 50
Haemolymph is observed in:
Haemolymph is observed in Arthropods. It is a fluid, analogous to the blood in vertebrates, that circulates in the interior of the arthropod (invertebrate) body, remaining in direct contact with the animal’s tissues.
- Question 21 of 50
The virus without capsid but only with nucleic acids is called:
The virus without capsid but only with nucleic acids is called Nucleoid. Nucleoid represents the viral chromosome. It is made of a single molecule of nucleic acid. Nucleoid is the infective part of the virus. The nucleic acid is either DNA or RNA but never both.
- Question 22 of 50
The immunity caused by the B-lymphocytes is called:
The immunity caused by the B-lymphocytes is called Humoral Immunity. Humoral immunity is the process of adaptive immunity manifested by the production of antibodies by B-lymphocytes. It develops in bone marrow.
- Question 23 of 50
Pink mould is the common name for:
Pink mould is the common name for Neurospora. Neurospora is a genus of Ascomycete fungi. It produces pink or red bread mould.
- Question 24 of 50
The sleeping sickness is caused by:
Trypanosomiasis, also known as sleeping sickness, is caused by microscopic parasites of the species Trypanosoma brucei.
- Question 25 of 50
Which of the following is biodegradable?
The leather belt is biodegradable. Biodegradable materials are substances that decompose naturally through the actions of bacteria, fungi, and other living organisms.
- Question 26 of 50
Lichen that grows on the bark are said to be:
Lichen that grows on the bark is said to be Corticolous. If it is found attached to a rock, it is saxicolous, and if it is found on the ground or soil, it is terricolous.
- Question 27 of 50
Hyperplasia means an abnormal increase in the number of cells in an organ or tissue. These cells appear normal under a microscope.
- Question 28 of 50
The part of root involved in water absorption is:
The part of the root involved in water absorption is zone of root hairs. Root hair found on roots causes an increase in the surface area of roots. This leads to the absorption of minerals and water that are dissolved in the absorbed water. Xylem is the tissue of vascular plants that transports water and nutrients from the roots of a plant to the tips of the leaves.
- Question 29 of 50
Commercially important cotton fibers are:
Commercially important cotton fibers are epidermal hairs of seeds. The cotton is found to grow around the seed coat of the cotton (Gossypium) plant.
- Question 30 of 50
A member of Liliaceae that shows reticulate venation is:
A member of Liliaceae that shows reticulate venation is smilax. The genus Smilax comprises about 300 species of mostly climbing plants distributed across both world’s temperate and tropical regions. The leaf venation is reticulate in species of Smilax, a member of the family Liliaceae.
- Question 31 of 50
Euphenics is the manipulation of genes. It is the science of making phenotypic improvements to humans after birth, generally to affect a problematic genetic condition. It deals with the treatment of hereditary defects through medical means.
- Question 32 of 50
Araneology is the study of spiders. It is the scientific study of arachnids, which comprise spiders and related animals such as scorpions, pseudoscorpions, and harvestmen. The raising of bees is known as apiculture. The study of aphids is known as aphidology. Acarology is the study of mites and ticks.
- Question 33 of 50
What does Corpus luteum (CL) secrete?
Corpus luteum (CL) is a yellow hormone-secreting body in the female reproductive system which secretes progesterone. It is a completely normal cyst that forms on the ovary every single month in women of childbearing age. This cyst is actually a group of cells inside ovaries that forms during each menstrual cycle. It appears right after an egg leaves the ovary (ovulation).
- Question 34 of 50
The male sex hormone is:
Testosterone is the primary sex hormone in males. It plays a key role in the development of male reproductive tissues such as testes and prostate, as well as promoting secondary sexual characteristics such as increased muscle and bone mass, and the growth of body hair.
- Question 35 of 50
Iodine test is used to detect:
Iodine test is used to detect starch (carbohydrates). When starch is present, the iodine changes from brown to blue-black or purple.
- Question 36 of 50
The branch of medicine involving synthetic chemical compounds is:
Allopathy is the branch of medicine involving synthetic chemical compounds. It is the treatment of disease by conventional means, i.e. with drugs having effects opposite to the symptoms.
- Question 37 of 50
The arsenic problem in India is primarily due to:
The arsenic problem in India is primarily due to overexploitation of coal. Mining, metal smelting and burning of fossil fuels are the major industrial processes that contribute to arsenic contamination of air, water and soil.
- Question 38 of 50
One of the best solutions to get rid of non-biodegradable wastes is:
As non-biodegradable wastes like plastic bags, glass bottles, etc., cannot be broken down by decomposers, their disposal poses a big problem. Recycling is one of the best solutions to get rid of non-biodegradable wastes.
- Question 39 of 50
Vermicomposting is done by:
Vermicomposting is done by worms. It is the process by which worms are used to convert organic materials (usually wastes) into a humus-like material known as vermin-compost.
- Question 40 of 50
If waste materials contaminate the source of drinking water, which of the following diseases will spread?
Typhoid is spread by sewage contamination of food or water. People who are infected with typhoid pass the Salmonella typhi bacteria in their faeces (poo) and urine. People can get typhoid if they eat food or drink a beverage that has been touched by a person who is infected with the typhoid bacteria and has not washed their hands properly after going to the bathroom.
- Question 41 of 50
Which vein brings clean blood from the lungs into the heart?
Pulmonary Vein brings clean blood from the lungs into the heart. Its function is to transport oxygenated blood from the lung alveoli into the left atria.
- Question 42 of 50
The biggest single-celled organism is:
Acetabularia is the biggest single-celled organism. It is genus of single-celled green algae (family Polyphysaceae) found in subtropical seas. The algae are among the largest single-celled organisms and also feature an unusually large nucleus.
- Question 43 of 50
Foramen Magnum is an aperture found in the:
Foramen Magnum (also called great hole) is an aperture found in the skull. It is a large, oval-shaped opening in the occipital bone of the skull.
- Question 44 of 50
Which branch of Zoology deals with the scientific study of animal behaviour?
Ethology is a branch of zoology dealing with the scientific study of animal behaviour.
- Question 45 of 50
‘Barr body’ is found in:
Barr body is the inactive X-chromosome in the somatic cells of mammalian females. Human females have two X chromosomes, while males have one X and one Y. In all of the female somatic cells, which don’t take part in sexual reproduction, one of the X chromosomes is active, and the other is inactivated in a process called lyonization, becoming the Barr body.
- Question 46 of 50
A contemporary of Charles Darwin, who came to the same conclusion in the matter of organic evolution was:
Charles Darwin (1809-1882) and Alfred Russel Wallace (1823-1913) were contemporary naturalists who proposed a similar theory of organic evolution. Wallace greatly admired On the Origin of Species. In turn, Darwin regarded Wallace as the one man who truly understood the idea of evolution by natural selection.
- Question 47 of 50
Casuarina is a:
Casuarina is a xerophyte plant. A xerophyte is a species of plant that has adaptations to survive in an environment with little liquid water, such as a desert or ice-covered region. Popular examples of xerophytes are Casuarina, cacti, pineapple, etc.
- Question 48 of 50
Male mosquitoes take their food from:
Both male and female mosquitoes eat the same things—Plant sap, nectar and plant derivatives—for energy. But only female mosquitoes imbibe a blood meal.
- Question 49 of 50
Total interacting animals and plants in any well-defined area is known as:
Biome is the total interaction between animals and plants in any well-defined area. It refers to the community of plants and animals that occur naturally in an area, often sharing common characteristics specific to that area.
- Question 50 of 50
The most healthy edible oil for the heart is:
Olive oil is one of the healthiest edible oil for the heart. It is a great source of monounsaturated fatty acids (MUFAs). MUFAs fall under the category of healthy dietary fats. These healthy fats are known to reduce the risk of heart disease by keeping cholesterol levels in check.