21. Who discovered nucleus of cell wall?
[A] Theodor Boveri
[B] Robert Brown
[C] Albert von Kolliker
[D] Robert Hooke
Show Answer
Correct Answer: B [Robert Brown]
Notes:
Robert Brown discovered the nucleus in the cell in 1831. The nucleus is a protoplasmic body in eukaryotic cells. It is covered by a double membrane that contains the hereditary details.
22. How many cells are in the human brain?
[A] roughly 171 billion cells
[B] roughly 200 billion cells
[C] roughly 151 billion cells
[D] roughly 250 billion cells
Show Answer
Correct Answer: A [ roughly 171 billion cells]
Notes:
The average male brain contains about 171 billion cells, including about 86 billion neurons.
23. How do pteridophytes differ from mosses?
[A] Independent gametophyte
[B] Dependent gametophyte
[C] Flagellate antherozoids
[D] Independent and dominant sporophyte
Show Answer
Correct Answer: D [Independent and dominant sporophyte]
Notes:
Pteridophytes differ from moss and seed plants in that both the generations are independent and dominant.
24. What is the function of chlorophyll?
[A] Emits green light
[B] Stores starch in leaves
[C] Trap Light energy
[D] Attract water
Show Answer
Correct Answer: C [Trap Light energy]
Notes:
Chlorophyll pigment in the green plant traps sunlight. The trapped energy is light energy which is further changed into chemical energy during the process of photosynthesis.
25. What is the function of Filiform apparatus?
[A] to guide pollen tubes entry
[B] extract food from the nucleus
[C] help metabolites at short distances
[D] All of the above
Show Answer
Correct Answer: D [All of the above]
Notes:
The function of a filiform apparatus is to direct the entry of pollen tubes, extract food from the nucleus, and transport metabolites over short distances.
26. What is the function of roots?
[A] anchor the plants in the soil
[B] absorb nutrients and water
[C] Both 1 and 2
[D] Neither 1 nor 2
Show Answer
Correct Answer: C [Both 1 and 2]
Notes:
Roots bind plants to the soil and absorb nutrients and water that are essential for the rest of the plant.
27. The tiny pores present on the leaves of plants are called__.
[A] Stomata
[B] Cells
[C] Chlorophyll
[D] Grains
Show Answer
Correct Answer: A [Stomata]
Notes:
The tiny pores present on the leaves of plants are called Stomata. Stomata are portals in plant leaves that control gas exchange for photosynthesis
28. Which phylum includes animals like planaria and liver fluke?
[A] Ctenophora
[B] Cnidaria
[C] Platyhelminthes
[D] Aschelminthes
Show Answer
Correct Answer: C [Platyhelminthes]
Notes:
Platyhelminthes phylum includes animals like planaria and liver fluke. They are triploblastic, acoelomate, and bilaterally symmetrical.
29. Which of the following are armored fish?
[A] Chondrichthyes
[B] Osteichtliyes
[C] Placoderms
[D] Acanthodians
Show Answer
Correct Answer: C [Placoderms]
Notes:
Placoderms are armored fish. The placoderms are a class of armored prehistoric fish, known from fossils, that lived from the Silurian to the end of the Devonian period.
30. To which family does true toad belong?
[A] Pelobatidae
[B] Leptodactylidae
[C] Bufonidae
[D] Hylidae
Show Answer
Correct Answer: C [Bufonidae]
Notes:
True Toads belong to the Bufonidae family. True toad’s skin is very warty with glands behind the eyes. Secretes a poisonous substance with a bad taste as a protection against predators. They have short legs designed for jumping rather than leaping.
