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Question 2

Honeybee makes honey from

(a) pollen

(b) petals

(c) nectar

(d) bud

Which of these muscles are striated and voluntary?

A conjoint and open vascular bundle will be observed in the transverse section of

(a) monocot root

(b) monocot stem

(c) dicot root

(d) dicot stem

Genomic DNA is digested with Alu I, a restriction enzyme which is a four base - pair cutter. What is the frequency with which it will cut the DNA assuming a random distribution of bases in the genome?

Question 13
Name a stain commonly used to colour chromosomes.

Plant growth regulator present in the sterile filtrates of the fungus?

(a) What are viviparous animals? Give two examples of viviparous animals.

(b) what are oviparous animals? Give two examples of oviparous animals.

Parkinson’s disease is caused by degeneration of brain neurons that are involved in release of dopamine

Identify true/false statements. Correct each false statement to make it true.

(a) Androgens are produced by Sertoli cells. (True/ False)

(b) Spermatazoa get nutrition from Sertoli cells. (True/ False)

(c) Leydig cells are found in ovary. (True/ False)

(d) Leydig cells synthesis androgens. (True/ False)

(e) Oogenesis takes place in corpus luteum. (True/ False)

(f) Menstrual cycle ceases during pregnancy. (True/ False)

(g) Presence or absence of hymen is not a reliable indicator of virginity or sexual experience. (True/ False)

Question 18

Name any two water pollutants which are toxic for plants and animals.

Mohit and Sumit want to buy a new car for their company. Mohit insisted on buying a CNG car with a better mileage but Sumit insisted on buying a diesel version of a high end car with better music system and A.C but relatively low mileage.

(a) Being a responsible citizen of Delhi, how will Mohit convince Sumit about his decision in the wake of rising pollution levels?

(c) Suggest two more measures which can help in reducing vehicular pollution. [3]

What is the world's smallest cell?

The minerals associated with redox reactions are:

Which of the following is an abdominal organ involved in the production and removal of blood cells?

During telophase of cell division(mitosis), ER gives rise to materials of

____% of starch is hydrolysed by salivary amylase

A myopic person has been
using spectacles of power −1.0 dioptre for distant vision.
During old age he also needs to use separate reading glass of power +
2.0 dioptres. Explain what may have happened.

Which of the following statements is NOT correct about glycolysis?

Match Column-I with Column-ll and select the correct option from the codes given below.

Column – I Column – ll

A. Nitrosomonas (i) Ammonia to nitrite

B. Nitrobacter (ii) Nitrite to nitrate

C. Pseudomonas (iii) Nitrate to N2

Name the type of joint between the following:
femur/acetabulum

33 percent of India’s (Gross Domestic Product) comes from:

The word taxon refers to

Label the diagram

A. This is which part of dicotyledonous plants?

B. If we remove part 1 from the plant, what will happen?

Which one of the following graphs most closely represents the relationship between the rate of transpiration of a mesophytic leaf and the atmospheric humidity?

Match the following:

$\begin{array}{cc}\text{Column I}& \text{Column II}\\ \text{p. Gene flow}& \text{i. Transfer of alleles from one population to another}\\ \text{q. Bottleneck effect}& \text{ii. A change in the frequency of alleles mainly}\text{due to chance events}\\ \text{r. Founder effect}& \text{iii. A sharp lowering of a population’s gene}\text{pool due to natural disasters}\\ \text{s. Genetic drift}& \text{iv. A few members of the original population}\text{colonise a new location away from the old}\end{array}$

Which of the following is correct structure of α-anomer of maltose?

Marsupials like ____have developed abdominal pouches to carry young ones.

Question 10
Which of the following is not a function of epidermis?

(a) Protection from adverse conditions
(b) Gaseous exchange
(c) Conduction of water
(d) Transpiration