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- Question
Outer covering of virus made up of protein is
Options- A. capsid
- B. coat
- C. virion
- D. viriod
- Correct Answer
- capsid
- 1. Plants synthesis protein from
Options- A. starch
- B. sugar
- C. amino acids
- D. fatty acids Discuss
- 2. Our major foods, fibres, spices, fruits and beverage crops are
Options- A. flowering plants
- B. gymnosperms plants
- C. pteridophytes
- D. bryophytes Discuss
- 3. 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
- 4. Norepinephrine increases
Options- A. respiration
- B. urine production
- C. saliva production
- D. blood pressure Discuss
- 5. 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
- 6. 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
- 7. Photosynthesis generally takes place in which parts of the plant?
Options- A. Leaf and other chloroplast bearing parts
- B. stem and leaf
- C. Roots and chloroplast bearing parts
- D. Bark and leaf Discuss
- 8. Neurospora is used as genetic material because
Options- A. it has short life cycle of 10 days
- B. the product of single meiosis can be easily analysed
- C. meiotic products are linearly arranged in the form of ordered tetrads
- D. is a diploid fungus Discuss
- 9. Our skin, when exposed to excess sunlight, becomes dark. This is because our skin pigments called
Options- A. flavoxanthin
- B. melanin
- C. carotene
- D. Xanthophyll Discuss
- 10. Nucleus, the genetic material containing rounded body in each cell, was first discovered in 1831 by
Options- A. Robert Hooke
- B. Robert Brown
- C. Rudolf Virchow
- D. Theodore Schwann Discuss
Biology problems
Search Results
Correct Answer: amino acids
Correct Answer: flowering plants
Correct Answer: nitrogen cycle
Correct Answer: blood pressure
Correct Answer: Secretion of hormones for calcium regulation in blood and bones
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.
Correct Answer: Leaf and other chloroplast bearing parts
Correct Answer: it has short life cycle of 10 days
Correct Answer: melanin
Correct Answer: Robert Brown
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