1. The plant hormone Auxin is basically a ___?
[A] Weak Organic Acid
[B] Weak Inorganic Acid
[C] Weak Organic base
[D] Gaseous compound of carbon
Show Answer
Correct Answer: A [Weak Organic Acid]
Notes:
Auxins are a class of plant hormones with some morphogen-like characteristics. Auxin is basically a Weak Organic Acid and It is produced in the stem tip that promotes the elongation in the cells.
2. A genetic code specifies how many kinds of amino acids?
[A] 12
[B] 15
[C] 20
[D] 25
Show Answer
Correct Answer: C [20]
Notes:
There are as many as 100 thousand kinds of proteins that constitute the body, and these comprise only 20 kinds of amino acids in various combinations.
3. Which among the following bacterial cells are found in cubical packets?
[A] Tetracocci
[B] Streptococci
[C] Staphylococci
[D] Sarcinae
Show Answer
Correct Answer: D [Sarcinae]
Notes:
Sarcina is a genus of Gram-positive cocci bacteria in the family Clostridiaceae. They are gram positive bacteria which are found in water and soil and thrive in low pH environment. They are arranged in cubical pockets.
4. Which among the following is essential for both activation and action of thrombin ?
[A] Na+
[B] Cl-
[C] Ca2+
[D] Mg2+
Show Answer
Correct Answer: C [Ca2+]
Notes:
Thrombin is a naturally occurring enzyme that converts fibrinogen into fibrin, which is an integral step in clot formation. Ca2+ is essential for both activation and action of thrombin.
5. In which of the following, the cellular power plants – Mitochondria are absent ?
[A] Red algae
[B] Green Algae
[C] Bacteria
[D] Brown Algae
Show Answer
Correct Answer: C [Bacteria]
Notes:
The mitochondria are common in Eukaryotic cells. Bacteria is Prokaryotic
6. Why do birds not experience respiratory issues while flying at high altitudes?
[A] Their lungs are larger relative to body size
[B] They fly inactively at high altitudes
[C] None of the above is correct
[D] Birds possess additional air sacs
Show Answer
Correct Answer: D [Birds possess additional air sacs]
Notes:
Birds have unique respiratory systems with extra air sacs that provide continuous airflow and efficient oxygen exchange, even at high altitudes where air is thinner. These adaptations help birds avoid respiratory trouble during flight.
7. Fruits ripen faster when kept in a / an __:
[A] rice container
[B] wheat container
[C] open container
[D] refrigerator
Show Answer
Correct Answer: A [ rice container]
Notes:
The primary reason why fruits ripen quicken when stored in a rice container is due to ethylene accumulation. Differences in the rate of ripening between fruits kept in a rice container and a wheat container might be due to the differences in carbon dioxide emission and self heating nature of these grains. Both wheat and rice grains (esp. brown rice) when not completely milled, still actively respire, thus releasing carbon dioxide and energy. Carbon dioxide is a known inducer of ethylene biosynthesis in a number of fruits e.g. tomato. Rice grains without a husk typically have no dormancy and thus respire more at normal storage conditions. Most wheat grains have moderate to high dormancy periods and respire less at normal storage conditions. This is the reason why fruits stored in a rice container ripen faster than the ones stored in a wheat container
8. Which one of the following is a useful functional association between fungi and the roots of higher plants?
[A] Mycorrhyza
[B] Lichen
[C] Root Nodules
[D] Cluster roots
Show Answer
Correct Answer: A [ Mycorrhyza]
Notes:
A Mycorrhyza is a composite organism consisting of a fungus (the mycobiont) and a photosynthetic partner (the photobiont or phycobiont) growing together in a symbiotic relationship.
9. Which of the following is the characteristic of water present in coconut?
[A] liquid endocarp
[B] liquid nucellus
[C] liquid mesocarp
[D] degenerated liquid endosperm
Show Answer
Correct Answer: D [degenerated liquid endosperm]
Notes:
The coconut water from tender coconut that we are familiar with, is nothing but free nuclear endosperm (made up of thousands of nuclei) and the surrounding white kernel is the cellular endosperm. In the most common types of endosperm development, the Primary Endosperm Nucleus (PEN) undergoes successive.
10. Which of the following fruits has its seed outside?
[A] Mango
[B] Banana
[C] Strawberry
[D] Orange
Show Answer
Correct Answer: C [Strawberry]
Notes:
Strawberry is the fruit which has its seeds outside the body. The “seeds” on the outside of a strawberry are actually the plant’s ovaries and are called “achenes.” Each “seed” is technically a separate fruit that has a seed inside of it.
