. Read each item carefully. Write the letter of the best answer on the line. 1. The transfer of pollen grains from anther of a male to the stigma of female flowe
A. fertilization B. pollination C. reproduction D. propagation
2. Reproduction in plants wherein male and female parts are needed.
A. asexual
B. budding C. sexual
D. pollination
3. Which plant part cannot undergo vegetative propagation?
A fruit
B. stem
C. leaf
D. root
4. What kind of reproduction involves one parent only?
A. asexual
B. fertilization C. sexual
D. pollination
5. It is a type of pollination that transfer pollen grains from anther to the stigma of
the same flower.
A. across-polination B. auto-pollination C. self-pollination D. cross pollinat
6.Which part of a flower are needed in pollination?
A. calyx and anther B. pistil and stamen C. pistil and petal D. sepal and pe
7. Ferns and mosses have no seeds and flowers. How do they reproduce?
A. stem
B. spores
C. bulb D. cones
8.How do the sperms of mosses and ferns move to reach the egg cells?
A. through pollen tubes B. by swimming C. transferred by birds D. picked by
insects
9.Flowering plants use flowers to reproduce. What is another name for flowerin
plants?
A. angiosperm B. gymnosperm C. conifers D. non- vascular
10.What would happen when a butterfly sips nectar from flower?
A. flower could wilt C. stamen could develop'a tube
B. pistil could break D. pollen grains could fall on the oti

answer : the correct answer is 2) hno₃ and naoh .

arrhenius concept of acid and base :

acid :

according to arrhenius acid are those which release h⁺ or hydronium ion (h₃o⁺) in aqueous solution .

example : hcl +h₂o ↔ h₃o⁺ + cl⁻

hcl is giving h₃o⁺ ion in water , hence it is an arrhenius acid .

base :

according to arrhenius , bases are those which releases oh⁻ ions in aqueous solution .

example : koh (aq) ↔ k⁺ + oh⁻

since koh is producing oh⁻ ions hence , it is an arrhenius base .

checking the options :

1) ch₃oh and naoh :

ch₃oh is known as methanol , an organic compound , which is neutral compound . the dissociation of ch₃oh is negligible . it is very very weak acid (ka = 3.2 * 10 ⁻¹² ) .

naoh being ionic gives na⁺ and oh⁻ ions in aqueous solution as :

naoh ↔ na⁺ + oh⁻ . hence it is an arrhenius base

it can be concluded that ch₃oh and naoh is not arrhenius acid and base.

2) hno₃ and naoh :

hno₃ is an ionic compound which gives ions h⁺ and no₃⁻ ion in aqueous solution as:

hno₃ + h₂o ↔ h₃o⁺ + no₃⁻

since it is giving h⁺ ion . hno₃ is arrhenius acid .

naoh being ionic gives na⁺ and oh⁻ ions in aqueous solution as :

naoh ↔ na⁺ + oh⁻

. hence it is an arrhenius base .

it can be said that hno₃ and naoh are arrhenius acid and base.

3) ch₃oh and hcl

as discussed ch₃oh is neutral compound .

while hcl in aqueous solution dissociates to give h⁺ and cl⁻ ions as :

hcl + h₂o→ h₃o⁺ + cl⁻ . so hcl is arrhenius acid .

hence , ch₃oh and hcl are not arrhenius acid and base.

4) hno₃ and hcl :

hno₃ as discussed gives h⁺ in aqueous solution , while hcl also gives h⁺ in aqueous solution .

hence both hno₃ and hcl are arrhenius acid they are not acid and base .

so the arrhenius acid and base are 2) hno₃ and naoh.