Correct

缺乏 vs 缺少

/ quēfá vs quēshǎo /
Strokes

Formula

1
不可缺少 (indispensable)

Definition

缺乏 and 缺少 both are Verbs, which means [lack; be short of].

Example

缺乏 and 缺少 either word will do with an object when it is not clear whether it is a complete lack or not enough.
1
cóngxiǎo
从小
quē
缺乏
  
(
quēshǎo
缺少
  
)
jiào
教育
  
,
dǒng
mào
礼貌
  

He is impolite for he was lack of schooling since childhood.

2
shuāngyǎn
双眼
tōnghóng
通红
  
,
kàn
jiù
shì
quē
缺乏
  
(
quēshǎo
缺少
  
)
shuìmián
睡眠
  

We can see that he lacks sleep from his red eyes.

3
gāng
gōngzuò
工作
  
,
quē
缺乏
  
(
quēshǎo
缺少
  
)
jīngyàn
经验
  

I'm a green hand, and I am lack of work experience.

4
Zhèxiàng
这项
gōngzuò
工作
jìnxíng
进行
de
hěn
màn
  
,
zhǔyào
主要
shì
yīnwèi
因为
quē
缺乏
  
(
quēshǎo
缺少
  
)
rénshǒu
人手
  

The progress of the work is very slow mainly due to the insufficiency of hands.

5
duì
xué
学习
quē
缺乏
  
(
quēshǎo
缺少
  
)
xìnxīn
信心
  

He has no confidence in his study.

6
Yóu
由于
quē
缺乏
  
(
quēshǎo
缺少
  
)
yángguāng
阳光
  
,
suǒ
所以
zhèxiē
这些
huā
cháng
de
hǎo
不好
  

The flowers do not grow very well for they want sunlight.

缺少 only can be used (with an object), when it is necessary to indicate definitely the lack of something or the definite quantity which is short.
缺乏 cannot be used in the last two examples.
7
Lǎo
jiàoshòu
教授
quēshǎo
缺少
zhùshǒu
助手
  

The old professor wants an assistant.

8
Zhège
这个
fángjiān
房间
quēshǎo
缺少
liǎng
zhāng
shūzhuō
书桌
  

The room needs two desks.

不可缺少 (indispensable) is a set phrase, and one cannot say 不可缺乏.
不可缺少 (indispensable)
9
妇女
shì
guójiā
国家
jiànshè
建设
zhōng
zhī
不可
quēshǎo
缺少
de
liang
力量
  

Women are an indispensable force in our country's construction.

10
Yángguāng
阳光
  
kōng
空气
shuǐ
shì
men
我们
shēngcún
生存
suǒ
不可
quēshǎo
缺少
de
  

Sunlight,air and water are essential to our living.

缺乏 can function as the predicate without an object, but 缺少 cannot.
11
men
我们
zhè
这里
业务
gàn
干部
hěn
quē
缺乏
  

We lack business cadres badly.

12
Jīngguò
经过
huàyàn
化验
zhī
得知
  
,
zhèzhǒng
这种
rǎng
土壤
zhōng
de
jiǎ
yuán
元素
hěn
quē
缺乏
  

From the test we know the soil is lacking for potash fertilizer.