Botany

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Q1. Ethylene exhibits its characteristic triple response in seedlings, which includes:
  • Inhibition of stem elongation, thickening of the stem, and horizontal growth.
  • Increased leaf expansion, root elongation, and faster seed germination.
  • Acceleration of flowering, increased transpiration, and decreased chlorophyll content.
  • Suppression of fruit ripening, promotion of seed dormancy, and increased stomatal closure.
Q2. What is the term used to describe the vertical distribution of different species occupying various levels in an ecosystem?
  • Zonation
  • Species composition
  • Biotic interaction
  • Stratification
Q3. Consider the given two statements:
Assertion (A): Secondary growth in dicot stems and roots results in an increase in girth.
Reason (R): The activity of the vascular cambium and cork cambium contributes to the formation of secondary tissues.

 

  • Both(A)and(R)are True and(R)correctly explains(A)
  • Both(A)and(R)are True but(R)does not correctly explain(A).
  • (A)is True but(R)is False.
  • Both(A)and(R)are False.
Q4. Water has an indirect effect on photosynthesis. Which of the following would be true?
  • Water stress increases the rate of photosynthesis by opening stomata.
  • Water stress has no effect on photosynthesis.
  • Water stress decreases the rate of photosynthesis by closing stomata.
  • Water stress changes the colour of light absorbed by pigments.
Q5. Which meristem is responsible for the regeneration of parts of grasses removed by the grazing herbivores?
  • Apical meristem
  • Intercalary meristem
  • Interfascicular cambium
  • Fascicular vascular cambium
Q6. Regarding the regions of the root tip:
I. Root cap protects the tender apex of the root
II. Region of elongation is proximal to region of meristematic activity
III. Region of maturation has root hairs
  • Only I and II are correct
  • Only I and III are correct
  • Only II and III are correct
  • I, II and III are correct
Q7. Which phase of the prophase I of meiosis I is recognized by the dissolution of the synaptonemal complex and the tendency of the recombined homologous chromosomes of the bivalents to separate from each other except at the sites of crossovers? 
  • Zygotene
  • Pachytene
  • iplotene
  • iakinesis
Q8. How many of the given genetic disorders are due to mutations in autosomal genes?
I: Sickle cell anaemia
II: Thalassemia
III: Phenylketonuria
IV: Haemophilia
  • 1
  • 2
  • 3
  • 4
Q9. The membrane of which of the following organelles does not relate functionally to the membranes of other three?
  • Endoplasmic reticulum
  • Mitochondria
  • Golgi apparatus
  • Lysosome
Q10. What type of biodiversity are we talking about when we say India has more than 1000 varieties of mangoes?
  • Genetic diversity
  • Species diversity
  • Ecological diversity
  • Evolutionary diversity
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