281. What is the full form of RNA?

1. Ribo Nucleic Acid
2. Ribo Nitric Acid
3. Ribo Nutrient Acid
4. Reverse Nucleic Acid

Option “1” is correct
Ribo Nucleic Acid (RNA) is a polymeric molecule essential in various biological roles in coding, decoding, regulation, and expression of genes.
282. Which among the following does not have a cell wall?

1. Euglena
2. Paramecium
3. Gonyaulax
4. Mycoplasma

Option “4” is correct
Mycoplasma is a genus of bacteria that lack a cell wall around their cell membrane. Without a cell wall, they are unaffected by many common antibiotics such as penicillin or other beta-lactam antibiotics that target cell wall synthesis.
283. Which of the following is not true about Pteridophyta?

1. Dominant phase is saprophytes
2. Main plant body is diploid
3. Seeds are present
4. Flowers are absent

Option “3” is correct
Pteridophyte are vascular plants i.e., plants with xylem and phloem, that reproduce and disperse via spores. They are seedless, vascular cryptogams.
284. The largest dolphin species is the orca, also called as ________.

1. Bottle Nose
2. Baiji
3. Killer whale
4. Tucuxi

Option “3” is correct
Orcas dolphin is also known as killer whales are the largest member of the dolphin family.
285. Sponges belongs to the phylum –

1. Protozoa
2. Annelida
3. Porifera
4. Cnidaria

Option “3” is correct
Sponges the members of the phylum Porifer ,are a basal Metazoa clade as sister of the Diploblasts.
286. Azolla increases soil fertility for –

1. Maize cultivation
2. Wheat cultivation
3. Barley cultivation
4. Rice cultivation

Option “4” is correct
Azolla is an efficient Nitrogen fixer. The use of Bio-fertilizers like Azolla not only increases the rice productivity but also improves the long term soil fertility.
287. Goitre is caused by the deficiency of _________

1. Zinc
2. Calcium
3. Iodine
4. Chlorine

Option “3” is correct
Goiter or goitre is enlargement of the thyroid gland. The most common cause for goitre is IODINE deficiency.
288. Which organ gets affected in Weil’s disease?

1. Kidney
2. Bleeding
3. Liver
4. All of these

Option “4” is correct
All of these gets affected in Weil’s disease.
289. Hydrophobia is caused by –

1. Bacteria
2. Fungus
3. Virus
4. Protozoan

Option “3” is correct
Fear of water is known as hydrophobia. Such type of patients gets afraid from river, lake sea etc. Hydrophobia is the old name of Rabies which is a viral disease. Its virus affects the nervous system.
290. Anthophobia is fear of the following:

1. Boss
2. Fire
3. Flowers
4. Dogs

Option “3” is correct
Anthophobia is an abnormal and persistent fear of flowers. The term comes from the Greek roots Anthos means flower and Phobos means fear.
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48 thoughts on “Biology”

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