521. The central fluid-filled cavity of blastula is known as:
A. Archenteron
(B. Blastocoels)
C. Blastocyst
D. Morula
522. Genetic identity of a human male is determined by:
A. Autosomes
B. Nucleolus
C. Cell organelles
(D. Sex chromosomes)
523. Fertilizin is a chemical substance produced from:
(A. Mature eggs)
B. Acrosome
C. Polar bodies
D. None of these
524. Photosynthesis is a process:
A. Reductive and exergonic
B. Reductive and catabolic
C. Reductive, endergonic, and catabolic
(D. Reductive, endergonic, and anabolic)
525. The phenomenon that converts light energy into chemical energy is:
A. Respiration
(B. Photosynthesis)
C. Transpiration
D. None of these
526. Osmosis is a function of:
(A. The number of solute molecules present in the solutions on the two sides of the membrane that is selectively permeable)
B. Pressure
C. Temperature
D. All of these
527. Which tissue is responsible for the passage of water in plants?
A. Sclerenchyma
(B. Xylem)
C. Collenchymatous
D. Phloem
528. The vegetation of the Thar desert consists of:
(A. Xerophytes)
B. Hydrophytes
C. Mesophytes
D. Thilophytes
529. A tissue that gives mechanical support to plant parts is:
A. Chlorenchyma
(B. Sclerenchyma)
C. Parenchyma
D. Phloem
530. Plants take nitrogen in the form of:
A. Ammonia
(B. Nitrates)
C. Nitrites
D. None
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