Page 36 - Biology - XII

Q9. The nucleus that leads in the pollen tube to the female gametophyte is
(a) gametes (b) pollen (c) intine (d) tube

Q10. Nutrient medium for pollen germination has—Boric acid, potassium nitrate, magnesium
sulphate, calcium nitrate in distilled water. The missing substance in the above list is
(a) water (b) beaker (c) sucrose (d) test tube
Q11. Centriole is absent in

(a) plant cells (b) animal cells (c) both (a) and (b) (d) none of these

Study the given fi gure. Based on it answer the following questions.

Q12. What is the number of cells produced from a single parent cell?
(a) One (b) Two (c) Three (d) Four

Q13. Identify the chromosome number in case of parent and daughter cells.
(a) 2n (b) diploid (c) Both (a) and (b) (d) haploid

Q14. What is the number of daughter cells produced by parents in each division?
(a) Four (b) Three (c) Two (d) One
Q15. The cell division in pollen grain involves how many steps?

(a) fi ve (b) four (c) three (d) two
Q16. The above scheme of mitotic cell division takes place in

(a) shoot tip/apex (b) root tip/apex (c) lateral meristem (d) (a), (b), and (c)
Q17. Unicellular organisms reproduced by
(a) meiosis (b) amitosis (c) prophase (d) none of these

Q18. In multicellular organisms, there are
(a) two types of cell divisions (b) four types of cell divisions

(c) many types of cell divisions (d) none of these
Q19. Mitosis helps in
(a) growth (b) repair (c) morphogenesis (d) all of these

Q20. Somatic means
(a) some cells (b) same cells (c) symmetrical cells (d) body cells

Q21. Mustard plants grown in the fi eld gives a beautiful basanti yellow colour. Also, ‘bee hives’ are
kept near by. Why?
(a) To add colour to the fi eld.
(b) Mustard fl owers are insect pollinated and honey bees do this job and collect/make honey in the
‘bee hive’.

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