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- Question
Norepinephrine increases
Options- A. respiration
- B. urine production
- C. saliva production
- D. blood pressure
- Correct Answer
- blood pressure
- 1. One of the following is not a function of bones.
Options- A. Place for muscle attachment
- B. Protection of vital organs
- C. Secretion of hormones for calcium regulation in blood and bones
- D. Production of blood corpuscles Discuss
- 2. Photo-oxidation is
Options- A. photorespiration
- B. photolysis
- C. light and oxygen induced breakdown
- D. All of the above Discuss
- 3. O2 released in the process of photosynthesis comes from
Options- A. CO2
- B. water
- C. sugar
- D. pyruvic acid Discuss
- 4. Plants wilt due to excess of
Options- A. transpiration
- B. photosynthesis
- C. absorption
- D. None of these Discuss
- 5. Plants that grow in saline water are called
Options- A. halophytes
- B. hydrophytes
- C. mesophytes
- D. thallophytes Discuss
- 6. N2 content is kept constant in the biosphere due to
Options- A. N2 fixation
- B. industrial pollution
- C. nitrogen cycle
- D. absorption of N2 Discuss
- 7. Our major foods, fibres, spices, fruits and beverage crops are
Options- A. flowering plants
- B. gymnosperms plants
- C. pteridophytes
- D. bryophytes Discuss
- 8. Plants synthesis protein from
Options- A. starch
- B. sugar
- C. amino acids
- D. fatty acids Discuss
- 9. Outer covering of virus made up of protein is
Options- A. capsid
- B. coat
- C. virion
- D. viriod Discuss
- 10. Radical vascular bundles are those in which
Options- A. xylem is surrounded by phloem
- B. phloem is surrounded by xylem
- C. xylem and phloem occur on the same radius
- D. xylem and phloem occur on the different radii Discuss
Biology problems
Search Results
Correct Answer: Secretion of hormones for calcium regulation in blood and bones
Correct Answer: All of the above
Correct Answer: water
Correct Answer: transpiration
Correct Answer: halophytes
Correct Answer: nitrogen cycle
Correct Answer: flowering plants
Correct Answer: amino acids
Correct Answer: capsid
Correct Answer: xylem and phloem occur on the different radii
Explanation:
In angiosperms the vascular bundles are mainly of three types (i) radial (ii) conjoint (iii) concentric.
(i) Radial : Presence of radial vascular bundles is the characteristic feature of roots. Those vascular bundles in which xylem and phloem are present on different radii are known as radial vascular bundles. In between xylem and phloem bundles parenchymatous cells are present.
(ii) Conjoint : In these vascular bundles xylem and phloem are present on the same radii. Conjoint vascular bundles may be collateral (phloem is present only outer to xylem) or bicollateral (phloem is present on both sides of xylem). If cambium is present between xylem and phloem then the vascular bundle is known as open, otherwise it is called closed.
(iii) Concentric : Those vascular bundles in which one type of vascular tissue is surrounded by another type are known as concentric vascular bundles. These bundles may be amphivasal or leptocentric(phloem is completely surrounded by xylem) or amphicribal or hardocentric (xylem is completely surrounded by phloem). Amphivasal bundles are found in Dracaena and Yucca. Amphicribal bundles are found in stamens of many dicots etc.
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