11. Which plant tissue is the only tissue with the highest refractive index due to the presence of pectin?
[A] Sclerenchyma
[B] Collenchyma
[C] Parenchyma
[D] Laticiferous
Show Answer
Correct Answer: B [Collenchyma]
Notes:
Collenchyma tissue is the only tissue with the highest refractive index due to the presence of pectin.
12. On which of the following factor rates of photosynthesis depends?
[A] pH
[B] Pressure
[C] Intensity of Light
[D] Amount of reactance
Show Answer
Correct Answer: C [Intensity of Light]
Notes:
The rate of photosynthesis mainly depends on the Intensity of Light, carbon dioxide concentration, and temperature.
13. Sweet potato is an example of which root?
[A] Conical roots
[B] Fusiform roots
[C] Tuberous roots
[D] Both 1 and 2
Show Answer
Correct Answer: C [Tuberous roots]
Notes:
Sweet potato is an example of Tuberous roots. Tuberous roots have no distinctive shape, appearing thick and fleshy.
14. Which of the following gases is not released by the leaves of a plant?
[A] Carbon dioxide
[B] Oxygen
[C] Nitrogen
[D] Water vapour
Show Answer
Correct Answer: C [Nitrogen]
Notes:
Carbon dioxide, Oxygen, and Water vapor are released by the leaves of a plant. Plants absorb nitrogen from the soil in a form of nitrate and ammonium.
15. What is the name of a plant disease in which there is fine webbing on the underside of the leaves?
[A] Spider Mites
[B] Anthracnose
[C] Mealybugs
[D] Rhizoctonia
Show Answer
Correct Answer: A [Spider Mites]
Notes:
Spider Mites is the name of a plant disease in which there is fine webbing on the underside of the leaves.
16. Earthworms and leeches belong to which phylum?
[A] Arthropoda
[B] Annelida
[C] Hemichordata
[D] Chordata
Show Answer
Correct Answer: B [Annelida]
Notes:
Earthworms and leeches belong to the phylum Annelida. They can be aquatic or terrestrial, free-living, or even parasitic. They have organs called nephridia for excretion.
17. Which of the following is a subdivision of Phylum Chordata?
[A] Urochordata
[B] Cephalochordata
[C] Vertebrata
[D] All of the above
Show Answer
Correct Answer: D [All of the above]
Notes:
Urochordata, Cephalochordata, and Vertebrata are subdivisions of Phylum Chordata. Chordata are bilaterally symmetrical, triploblastic with an organ-system level of classification.
18. Which one is NOT true about sponges?
[A] They are multicellular
[B] They are autotrophs
[C] They are eukaryotes
[D] They are the simplest animals lacking tissue and organs
Show Answer
Correct Answer: B [They are autotrophs]
Notes:
Sponges are multicellular, eukaryotes, and the simplest animals lacking tissue and organs.
19. The respiratory pigment in Mollusca is __.
[A] Hemoglobin
[B] Hemocyanin in the blood cells
[C] Myoglobin
[D] Haemocyanin in the blood plasma
Show Answer
Correct Answer: D [Haemocyanin in the blood plasma]
Notes:
The respiratory pigment in Mollusca is Haemocyanin in the blood plasma.
20. Which of the following statements is true about Unio?
[A] Unio has a one chambered heart
[B] Unio has a two-chambered heart
[C] Unio has a three-chambered heart
[D] None of the above
Show Answer
Correct Answer: C [Unio has a three-chambered heart]
Notes:
Unio is a genus of medium-sized freshwater mussels. It is an aquatic biennial mollusk, the river mussels, in the family Unionidae. Unio has a three-chambered heart.
