Biology

Q.

What is the ploidy of nucellus, MMC, functional megaspore, and female gametophyte?

Q.

Identify the wrong statement with regard to Restriction Enzymes.

1. They are useful in genetic engineering.

2. Sticky ends can be joined by using DNA ligases.

3. Each restriction enzyme functions by inspecting the length of a DNA sequence.

4. They cut the strand of DNA at palindromic sites.

Q.

Explain the term population explosion.

Q.

If there are 999 bases in an RNA that code for a protein with 333 amino acids, and the base at position 901 is deleted such that the length of the RNA becomes 998 bases, how many codons will be altered?

1. 1

2. 11

3. 33

4. 333

Q.

What controls the opening and closing of stomata?

Q.

What is the menstrual cycle? Which hormones regulate the menstrual cycle?

Q.

Give the functions of endoplasmic reticulum.

Q.

Which among the following is a non-reducing sugar?

1. Lactose

2. Maltose

3. Sucrose

4. Fructose

Q.

List out a few general characteristics of organic compounds?

Q.

Which of the following is the most stable ecosystem?

1. Mountain

2. Desert

3. Forest

4. Ocean

Q.

Multicellular organisms have division of labour. Explain.

Q.

Explain the role of producers, consumers and decomposers in ecosystem.

Q.

How does a frogs heart differ from a human heart?

Q.

Which among the following are non organised endocrine glands

1. Heart and kidney

2. hypothalamus

3. Parathyroid gland

4. liver and intestine

Q.

What is the feminine gender for peacock?

Q.

Intercellular material is solid and pliable in:

1. cartilage

2. blood

3. lymph

4. bone

Q.

Define and understand the following terms:

(i) Phylum (ii) Class (iii) Family (iv) Order (v) Genus

Q.

List 4 functions of fat.

Q.

How are fats digested in our body?

Q.

What is saltatory conduction?

Q. The membrane of the erythrocytes has approximately ___% of proteins and ___% lipids.

1. 50, 50
2. 42, 50
3. 60, 40
4. 52, 40

Q.

State a list of nonpoisonous snakes.

Q.

How do algae reproduce?

Q.

Explain nutrition in fungi.

Q.

What is the meaning of plasmodesmata?

Q.

A bacterium divides every 35 minutes. If a culture containing 10⁵ cells per mL is grown for 175 min, what will be the cell concentration per mL after 175 minutes?

1. 32 X 10⁵ cells

2. 175 x 10⁵ cells

3. 5 x 10⁵ cells

4. 35 x 10⁵ cells

Q.

Which one of the following viruses contains both DNA and RNA?

1. Cyanophage

2. Herpes virus

3. Leuko virus

4. Polio virus

Q.

The difference between spermiogenesis and spermiation is?

1. In spermiogenesis, spermatozoa from Sertoli cells are released into the cavity of seminiferous tubules, while in spermiation spermatozoa are formed

2. in spermiogenesis, spermatozoa are formed, while in spermiation, spermatozoa are released from Sertoli cells into the cavity of seminiferous tubules

3. In spermiogenesis, spermatids are formed, while in spermiation, spermatozoa are formed

4. In spermiogenesis, spermatozoa are formed, while in spermiation, spermatids are formed

Q.

What is the allosteric inhibitor? Explain with an example.

Q.

What are the characteristics of cloning vectors?