1. Which one of the following does not belong with the others?
[A] Fish
[B] Crab
[C] Prawn
[D] Snail
Show Answer
Correct Answer: A [Fish]
Notes:
All the species listed are water-dwelling creatures. However, a fundamental difference is that fish belong to the group of vertebrates, meaning their body possesses a spinal column. In contrast, crabs, prawns, and snails are invertebrates, denoting that they lack a backbone. Specifically, crabs and prawns are crustaceans, within the larger class of invertebrates, characterised by their exoskeleton and segmented bodies. Snails are grouped as molluscs, also a class of invertebrates, known for their soft unsegmented body. Hence, in this context, fish are different from the others.
2. Non-vascular embryophytes are __:
[A] Pteridophytes
[B] Algae
[C] Bryophytes
[D] Gymnosperms
Show Answer
Correct Answer: C [Bryophytes]
Notes:
Bryophytes are an informal group consisting of three divisions of non-vascular land plants: the liverworts, hornworts and mosses. They play a vital role in regulating ecosystems because they provide an important buffer system for other plants.
3. The monocarpic plants produce flowers only ________?
[A] Once in a year
[B] Once in a season
[C] Once in lifetime
[D] One flower per plant
Show Answer
Correct Answer: C [Once in lifetime]
Notes:
The monocarpic plants produce flowers only once in lifetime. Monocarpic plants are those that flower, set seeds and then die.
4. The bacterium ‘Escherichia coli’ is found mainly in:
[A] Human Intestine
[B] Pteridophytes
[C] Root Nodules of leguminous plants
[D] Paddy fields for nitrogen fixation
Show Answer
Correct Answer: A [Human Intestine]
Notes:
Escherichia coli, also known as E. coli, is a Gram-negative, facultative anaerobic, rod-shaped, coliform bacterium of the genus Escherichia. It is a type of bacteria that normally lives in your intestines.
5. Which of the following ecosystems showcases the highest biodiversity?
[A] Mangroves
[B] Deserts
[C] Coral Reefs
[D] Alpine Meadows
Show Answer
Correct Answer: C [Coral Reefs]
Notes:
The Coral Reef ecosystem showcases the highest biodiversity among the options provided. This is due to the ideal tropical environment in which they exist, offering a wide range of habitats, shelter, and nourishment for an astonishing array of marine life. In terms of biodiversity, they are second only to tropical rainforests. Interestingly, despite covering less than 1% of the ocean floor, coral reefs support about 25% of all known marine species.
6. What do we call the roots of some orchid plants, which hang in the air and absorb moisture from it?
[A] Assimilatory Roots
[B] Epiphytic Roots
[C] Sucking Roots
[D] Stilt Roots
Show Answer
Correct Answer: B [ Epiphytic Roots]
Notes:
Epiphytic roots are the roots of some orchid plants, which hang in the air and absorb moisture and nutrients from the air, rain water. Examples of epiphytic roots are mosses, liverworts, lichens, and algae of temperate zone and ferns, cacti, orchids, and bromeliads in the tropics.
7. Opium is a plant product obtained from which part of the plant?
[A] Roots
[B] Stem bark
[C] Dried Latex
[D] Dried leaves
Show Answer
Correct Answer: C [Dried Latex]
Notes:
The opium poppy straw is harvested from cultivation of pharmaceutical entities, the liquid or dried sap (known as opium latex that is obtained by lancing the outer surface of poppy pods) is the starting material for the clandestine production of heroin. Poppy straw is derived when latex are fully mature and dried by mechanical means.
8. Which of the following is correlated with blood pressure?
[A] Pancreas
[B] Liver
[C] Adrenal
[D] Testis
Show Answer
Correct Answer: C [Adrenal]
Notes:
Pheochromocytoma, a rare, usually benign, tumor of the adrenal glands resulting in the glands secreting excessive amounts of the hormones adrenaline and noradrenaline (catecholamines). This causes variable symptoms such as high blood pressure, sweating, etc.
9. Which of the following is the reason behind bleeding through nose in high mountain regions?
[A] The pressure of the blood capillaries is higher than the outside pressure
[B] The pressure at high altitudes is greater than that in the plains
[C] The blood pressure increases at high altitudes
[D] The blood pressure decreases at high altitudes
Show Answer
Correct Answer: A [The pressure of the blood capillaries is higher than the outside pressure]
Notes:
As altitude increases, the availability of oxygen decreases, making the air thinner and drier. Dry climates can cause drying and cracking inside the nose, which can lead to a nosebleed. The climate inside nose gets drier. This makes the blood vessels exposed inside your nose more likely to burst there than at lower altitudes.
10. In a bisexual flower, if androecium and gynaecium mature at different times, which of the following is the name given to the phenomenon?
[A] Dichogamy
[B] Herkogamy
[C] Heterogamy
[D] Monogamy
Show Answer
Correct Answer: A [Dichogamy]
Notes:
Dichogamy is the condition in which the male and female reproductive organs of a flower mature at different times, thereby ensuring that self-fertilization does not occur.