Biology Today — December 2017

41. Refer to the given Venn diagram and select the correct
    option regarding P, Q and R.

It is

a simple dry

fruit.

It is

single seeded,

indehiscent fruit

bearing membranous,

winged pericarp.

It is

many seeded

dehiscent fruit

where ovary contains

a false septum

called replum.

P Q

R

(a) P is a samaroid fruit present in plants where seeds are

dispersed by the agency of wind.

(b) Q is elongated fruit that dehisces by two valves starting

from base upwards to expose the replum bearing seeds.

(c) R develops from a flower having polycarpellary

apocarpous gynoecium where pericarp remains dry

and undifferentiated.

(d) P could be cypsela present in Sonchus, Q could be

follicle present in larkspur and R could be simple

samara present in Ulmus.

42. Study the given figures A and B.

A B

Select the option which identifies the correct statements

regarding them.

I. It is a diffused trailer of Euphorbia prostrata that

spreads in one direction only.

II. It is an elongated horizontal stolon of jasmine, the tip

of which grows above the level of ground.

III. It is a runner of Centella asiatica that arises from erect

shoot and bears horizontal or prostrate branches called

crowns.

IV. It is a stolon of Colocasia, the tip of which does not

come above ground.

A B

(a) I IV

(b) II III

(c) III IV

(d) I III

43. Refer to the given list of plants and identify how many of these
    possess fruits which are multi-seeded, dry, simple and dehiscent
    in which the pericarp splits open to expose the seeds?
    Ulmus, Sonchus, Maize, Rice, Cashewnut, Candytuft,
    Mustard, Larkspur, Pea, Abrus, Groundnut, Fennel,
    Abutilon, Acacia, Mimosa
    (a) Eight (b) Nine
    (c) Seven (d) Five


44. Study the given table regarding certain features (i to iv) of
    two plant families: Solanaceae and Fabaceae.

Features

Plant families

Solanaceae Fabaceae

(i) Inflorescence Raceme, spike or

rarely solitary

Axillary or extra- axillary

helicoid cyme

(ii) Flower Complete,

actinomorphic

Complete, zygomorphic

(iii) Androecium Stamens five,

epipetalous

Stamens ten,

diadelphous, sometimes

monadelphous

(iv) Gynoecium Bicarpellary

syncarpous

ovary with axile

placentation

and swollen

placentae

Monocarpellary,

unilocular ovary with

marginal placentation

Which of these features of plant families have been correctly

described?

(a) (i) and (ii) only (b) (ii) only

(c) (i) and (iv) only (d) (ii), (iii) and (iv) only

45. Refer to the given figure of

A B

twigs A and B and select

the option which includes

correct statements regarding

them.

I. Only one leaf is borne on a node and leaves of adjacent

nodes lie roughly towards opposite sides.

II. Two leaves are borne on the opposite sides of a single node.

III. Leaves of the successive nodes lie in same plane

forming two rows on stem as in Syzygium.

IV. Leaves of adjacent nodes lie at right angles forming

four rows of leaves on stem, as in Calotropis.

V. More than three leaves develop from a single node as

in Zinnia.