Home
Class 12
BIOLOGY
Select true statements :- (a) Lenticel...

Select true statements :-
(a) Lenticels are absent in woody climbers and leaves
(b) Lenticles occur in most woody trees
(c) The spring wood is lighter in colour and has a lower density
(d) The sap wood also called as duramen

A

a , b and c are correct

B

a and b are correct

C

b and d are correct

D

a and c are correct

Text Solution

Verified by Experts

The correct Answer is:
A
Promotional Banner

Similar Questions

Explore conceptually related problems

Consider the following statements (a). In termperate regions, climatic conditions are not uniform through out the year. (b) Lenticels occur in most woody trees. (c) Complimentary cells are formed by the activity of phellogen. How many of above statement are correct?

Go through the following statements (i) The cambium is generally more acitve on the inner side than on the outer. (ii) The autunn wood is darker and has a higher density than spring wood. (iii) In stem, the secondary xylem shows distinction into protoxylem and metxylem and occurs in the from of patches. (iv) The tracheids and vessels of the sapwood get plugged by the ingrowth of the adjacent parenchyma cells into thier cavities called tyloses. Which of theses are correct ?

Read following statements for role of water in plant life Statements (a) it provides the medium in which most substances are dissolved . (b) dry matter in most herbs is about 10 to 15 per cent of its fresh weight (c) distribution of water within a plant varies . (d) woody parts have relatively very little water , (e) a dry seed has no water

Consider the following four statements (a-d) and select the option which includes all the correct ones only :- (a) All the time of inspiration , contracion in diaphragm and external intercostal muscles take place. (b) Normal breathing is also called as abdominal breathing. (c ) Expiration during sneezing, coughing, yoga is normal expiratio during which IICM and abdominal muscles relax. (d) Inspiration can occur if the pressure within lungs (intra pulmonary pressure) is more than the atmospheric pressure.

Read the following statements, state true (T) or false (F) for them and select the correct option. (a) Cleistogamous flowers prevent geitonogamy as well as xenogamy. (b) Double fertilisation occurs in all spermatophytes. (c) In pea family, the single cotyledon is called scutellum. (d) Seeds of castor and coconut retain a part of endosperm during embryo development.

Assertion: The spring woood is lighter in colour and has a higher denistiy wheras the autumn wood is darker and has a lower density . Reasons: In the spring season, cambium is less active while in winter the cambium is very active