Multiple Choice Questions
1. Stomata open due to
a, influx of calcium ions . influx of potassium ions
c. efflux of potassium ions d influx of hydrogen ions
2. Loss of water in the early morning from tips of leaves, is called
a. guttation
b. transpiration
c, respiration
d. bleeding
3. Maximum water loss occurs through
a, stomato
b. lenticels
c. hydathodes
d. cuticle
4. In a free floating hydrophyte, stomata are
a. absent
b, present on upper surface
c. present on lower surface
d. present on both surfaces
5. Which of the following is Not an isobilateral leaf?
a. Rice
b. Wheat
c. Sugarcane
d. Mango
6. The leaf showing stomata on both the surfaces is known as
a. astomatic leaf
b. epistomatic leaf
c. hypostomatic leaf d. amphistomatic leaf
Answers
Answer:
1. As a result of accumulation of ions there is a reduction in water potential of guard cells. The reduction in water potential causes absorption of water from adjacent cells, guard cells become turgid and stomata open.
2.Guttation is the process of loss of water droplets from pores known as hydathodes and tips of leaves. So the correct answer is 'Guttation'.
3.Maximum water loss takes place through stomata in the process called transpiration. In this process water is lost in vapour form. Water loss also occurs through hydathodes in liquid form.
4.Free-Floating Hydrophytes: Plants of this group remain floating on the surface of the water, but in some species the roots remain embedded in the mud and only leaves and flowers float on the surface of water (e.g., Nymphaea, Limnanthemum, Victoria regia, Euryale ferox)
6.amphistomatous leaf has stomata on both surfaces. Most plants have such a distribution.
Answer:
1=d
2=a
3=a
4=c
5=c
6=a these are the answers