Page 35 - Biology - XII

VIVA VOCE

Q1. What is pollen tube?
Ans. Pollen tube is an extension of intine.

Q2. What is the role of pollen tube?
Ans. Pollen tube carries the male gametes to the ovule.
Q3. What is pollen grain?
Ans. It is the product of meiosis cell division in angiosperms.

Q4. What is the other name of pollen?
Ans. Microspore
Q5. What is the outer coat of pollen called?
Ans. Exine

Q6. What does pollen contain?
Ans. Pollen has male gametophytes (gametes) and tube nucleus/cell or generative cell and tube nucleus.

COMPETENCY BASED QUESTIONS

Multiple Choice Questions

Q1. Male gametes are formed from
(a) tube cell (b) vegetative cell (c) pollen (d) generative cell

Q2. Pollen is trinucleate as a rule in
(a) Portulaca (b) cereal crops like wheat
(c) maize and sugarcane (d) all of these
Q3. Tube nucleus in the pollen tube

(a) always precedes gametes (b) follows gametes
(c) disturbs gametes (d) kills gametes

Q4. The pollen cell has
(a) tube nucleus (b) generative nucleus (c) both (a) and (b) (d) none of these
Q5. Spermatogenesis means

(a) formation of pollens (b) formation of male gametes
(c) formation of gametes (d) all of these
Q6. The structure that stays on the stigma of the fl ower is

(a) exine part (b) intine part (c) germ pore (d) nucleus
Q7. The coat of pollen with these features: tough, rough, protective and made of sporollenin is
(a) intine (b) exine (c) germ pore (d) pollen tube

Q8. Number of gametes present in the pollen tube
(a) 1 (b) 2 (c) 3 (d) 4

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