11. Which among the following is an optimum temperature for wheat seed germination?
[A] 11-15 deg celsius
[B] 15-25 deg celsius
[C] 10-12 deg celsius
[D] 20-22 deg celsius
Show Answer
Correct Answer: C [10-12 deg celsius]
Notes:
10-12 deg celsius is the optimum temperature for wheat germination. 25-30 deg celsius is the optimum temperature for crop growth.
12. rRNA is synthesized by which of the following?
[A] Nucleus
[B] Nucleolus
[C] Golgi body
[D] Cytoplasm
Show Answer
Correct Answer: B [Nucleolus]
Notes:
Molecules of rRNA are synthesized by the nucleolus in a specialized region of the cell nucleus, which appears as a dense region within the nucleus and contains genes encoding rRNA.
13. A segment of DNA consists of 120 adenine and 120 cytosine bases. What is the total number of nucleotides present in the segment?
[A] 120
[B] 240
[C] 345
[D] 480
Show Answer
Correct Answer: D [480]
Notes:
According to Chargaff’s laws, the amount of adenine is always equal to that of thymine, and the amount of guanine is always equal to that of cytosine, i.e. A = T(120) and G = C (120), hence, the total no. The number of nucleotides would be 120 x 4 = 480.
14. Which of the following virus is covered?
[A] Adeno
[B] Herpes
[C] Polio
[D] None of these
Show Answer
Correct Answer: B [Herpes]
Notes:
The Herpesviridae are a large family of DNA viruses. It causes infections and some diseases in animals, including humans. Members of this family are also known as herpesviruses.
15. Which of the following is a true moss?
[A] Club moss
[B] Reindeer moss
[C] Irish moss
[D] Bogg moss (Sphagnum)
Show Answer
Correct Answer: D [Bogg moss (Sphagnum)]
Notes:
Because club moss is pteridophyte and reindeer moss and Irish moss are lichens.
16. Which of the following transports the food through the leaf to the rest of the plant?
[A] Xylem
[B] Phloem
[C] Photosynthesis
[D] Guttation
Show Answer
Correct Answer: B [Phloem]
Notes:
The veins of the leaves are provided with vascular tissue called xylem and phloem. The xylem transports water from the roots to the leaves and the phloem transports food through the leaf to the rest of the plant.
17. __ tissues synthesize natural cytokinins.
[A] Old
[B] Rapidly dividing
[C] Storage
[D] None of the above
Show Answer
Correct Answer: B [Rapidly dividing]
Notes:
Rapidly dividing tissues synthesize natural cytokinins. Cytokinins are produced in actively growing tissues such as embryos, developing fruits, and roots.
18. Which fruit is produced by parthenocarpy?
[A] Brinjal
[B] Apple
[C] Banana
[D] Jackfruit
Show Answer
Correct Answer: C [Banana]
Notes:
Banana fruit is produced by parthenocarpy. The process of development of fruit without any prior fertilization is called parthenocarpy.
19. What does a plant need to survive?
[A] sunshine
[B] nutrients
[C] water
[D] All of the above
Show Answer
Correct Answer: D [All of the above]
Notes:
A plant needs sunshine, nutrients, and water to survive. Plants provide food, medicine, shelter, and the oxygen we need to breathe.
20. Which of the following statements is true about the root modification?
[A] The temporary change in the root structure
[B] The permanent changes in the root structure
[C] The permanent changes in the internal root structure
[D] The temporary changes in the external root structure
Show Answer
Correct Answer: B [The permanent changes in the root structure]
Notes:
Root modification is the permanent changes in the root structure. The root is an underground part of the plant. It absorbs water and minerals from the soil and binds firmly to the plant.
