Biology Class 11th Chapter 5 mcqs

1. Thors and spines are

(a) homologous organs

(b) analogous organs

(c) thron is homologous while spine is analogous

(d) spine is homologous while is analogous

Answer: (d) A

2. In which of the following plants stems do not store the food material

(a) potato

(b) ginger

(c) onion

(d) colocasia

Answer: (c) onion

3. In banana, the stem is

(a) underground only

(b) both underground and aerial

(c) absent

(d) aerial only

Answer: (a) underground only

4. Srem modified to perform the function of a leaf and having many internodes is called as

(a) phylloclade

(b) cladode

(c) offset

(d) phyllode

Answer: (a) phylloclade

5. Certain plants called as runners can be easily propagated. This is due to the fact

(a) they are numerous in numbers

(b) they store the ready food

(c) they lie horizontally on the soil

(d) they can produce adventitious roots quite readily at the nodes

Answer: (d) they can produce adventitious roots quite readily at the nodes

6. The coloured part of a Bougainuillea flower is the

(a) corolla

(b) calyx

(c) bracts

(d) androecium

Answer: (c) bracts

7. The axillary buds arise

(a) endogenously from the pericycle

(b) exogenously from the tissues of the shoot apex

(c) endogenously from the cambium tissues

(d) exogenously from the innermost layers of cortex

Answer: (b) exogenously from the tissues of the shoot apex

8. The arrangement of sepals or petals in floral bud is called

(a) Placentation

(b) Aestivation

(c) Bracteate

(d) Phyllotaxy

Answer: (b) Aestivation

9. The term phyllotaxy is used to describe the

(a) type of ovary in a plant

(b) mode of arrangement of leaves

(c) type of roots

(d) arrangement of sepals and petals

Answer: (b) mode of arrangement of leaves

10. In tamarind, the pinnate leaf is

(a) bipinnate

(b) tripinnate

(c) paripinnate

(d) imparipinnate

Answer: (a) bipinnate

11. Artabotrys is a hook climber in which the hooks are modified

(a) inflorescence axis

(b) petiole

(c) roots

(d) stipules

Answer: (a) inflorescence axis

12. Exceptional roots of Cuscuta are

(a) haustorial

(b) coralloid

(c) mucorhizal

(d) all of the above

Answer: (a) haustorial

13. The petiole is swollen and spongy in

(a) Nepenthes

(b) Trapa

(c) Clematis

(d) all of the above

Answer: (b) Trapa

14. Which one of the following plants dose not have root – pockets

(a) Pistia

(b) Lemna

(c) Ficus

(d) Eichhornia

Answer: (c) Ficus

15. The largest petal overlaps the lateral ones in _________ aestivation.

(a) Papilionaceous

(b) Valvate

(c) Twisted

(d) Imbricate

Answer: (a) Papilionaceous

16. In Lathyrus, the leaves are modified into

(a) thorns

(b) cladodes

(c) tendrils

(d) spines

Answer: (c) tendrils

17. Potato tuber is an underground stem because

(a) it lacks chlorophyll

(b) it is swollen

(c) it possesses axillary buds

(d) it stores starch as reserve food material

Answer: (c) it possesses axillary buds

18. Floating roots are characteristic of

(a) Tinospora

(b) Jussiaea

(c) Viscum

(d) Vanda

Answer: (b) Jussiaea